
ZYXEL COMMUNICATIONS CORPORATION

ELITE 2864L

Card Type                      Modem (synchronous/asynchronous)
Chipset                        Siemens-Nixdorf
Maximum Modem Rate             28.8Kbps
Maximum Fax Rate               14.4Kbps
Data Bus                       Serial/Parallel
Fax Class                      Class I & II
Modem Modulation Protocol      Bell 103A/212A

                               ITU-T V.21, V.22, V.22bis, V.23, V.26bis,
                               V.27bis, V.29, V.32, V.32bis, V.33, V.34

                               ZyXEL ZyX19200, ZyX16800, ZyCELL cellular
Fax Modulation Protocol        ITU-T V.17, V.21CH2, V.27ter, V.29
Error Correction/Compression   MNP5, V.42, V.42bis

[Image]

                                CONNECTIONS

       Function          Label              Function               Label

  RS-232/422 port            CN1     Parallel port                  CN5

  Switched line out          CN2     Data/voice switch              BT1

  Leased line out            CN3     Originate/answer switch        BT2

  DC power                   CN4

                  DRAM

     Size        Bank 0        Bank 1

     4MB        (2) 4M x 4      None

     8MB        (2) 4M x 4   (2) 4M x 4

                             DIAGNOSTIC LED(S)

    LED        Color      Status                   Condition

    PWR         Red         On                    Power is on

    PWR         Red         Off                  Power is off

    TST         Red         On               Modem is in test mode

    TST         Red         Off            Modem is not in test mode

    FAX         Red         On          Modem is connected in fax mode

    FAX         Red         Off       Modem is not connected in fax mode

     LL         Red         On         Modem is connected on leased line

     LL         Red         Off         Modem is not connected on leased
                                                     line

     SP         Red         On         Modem is communicating over serial
                                                     port

     SP         Red         Off         Modem is not communicating over
                                                  serial port

    PRP         Red         On          Modem is printing over parallel
                                                     port

    PRP         Red         Off       Modem is not printing over parallel
                                                     port

    PCP         Red         On            Modem is communicating over
                                                 parallel port

    PCP         Red         Off         Modem is not communicating over
                                                 parallel port

  V34 Status       V32b                       Condition
                  Status

      Off          Off       Modem is operating with a modulation earlier
                                              than V.32

      Off           On          Modem is operating with V.32bis or V.32
                                              modulation

      On           Off         Modem is operating with V.34 modulation

      On            On         Modem is operating with ZyXEL proprietary
                                              modulation

     AA         Red         On                Auto-answer enabled

     AA         Red         Off              Auto-answer disabled

     AA         Red      Blinking              Phone is ringing

     CD         Red         On              Carrier signal detected

     CD         Red         Off           Carrier signal not detected

    LED        Color      Status      Terminal Mode      Printer Mode

  DTR/POL       Red         On        DTR signal is   Printer is on-line
                                          high

  DTR/POL       Red         Off       DTR signal is   Printer is off-line
                                           low

  DSR/PSL       Red         On        DSR signal is     Printer is ready
                                          high             for input

  DSR/PSL       Red         Off       DSR signal is      Printer is not
                                           low          ready for input

  RTS/PPE       Red         On        RTS signal is    Printer is out of
                                          high               paper

  RTS/PPE       Red         Off       RTS signal is        Printer is not
                                           low              out of paper

  CTS/PER       Red         On        CTS signal is       Printer has
                                          high           encountered an
                                                             error

  CTS/PER       Red         Off       CTS signal is     Printer has not
                                           low           encountered an
                                                             error

    TXD         Red         On            Modem is transmitting data

    TXD         Red         Off         Modem is not transmitting data

    RXD         Red         On              Modem is receiving data

    RXD         Red         Off           Modem is not receiving data

     EC         Red         On             Error correction enabled

     EC         Red         Off            Error correction disabled

     EC         Red      Blinking        Modem is retransmitting data

                         DIAGNOSTIC LED(S) (CONT)

    LED      Color     Status                    Condition

    SQ        Red        On               Signal quality is good

    SQ        Red     Blinking            Signal quality is poor

    OH        Red        On                  Modem is off-hook

    OH        Red       Off                  Modem is on-hook

    ORG       Red        On             Modem is in originate mode

    ORG       Red       Off               Modem is in answer mode

                         Proprietary AT Command Set

                          BIT-MAPPED REGISTER S14

  Format:               AT [cmds] S14=n [cmds]

  Default:              2

  Range:                0 - 255

  Unit:                 Bit-mapped

  Description:          Controls sync/async, clock source, line type,
                        loopback test request, and leased line mode.

    Bit       Value                         Function

     0              0   Originate mode in leased line operation.

                   1    Answer mode in leased line operation.

     1              0   Grant request for remote digital loopback test.

                   1    Deny request for remote digital loopback test.

   3, 2            00   Switched line type.

                   01   Two-wire leased line type.

                  10    Four-wire leased line type.

   5, 4            00   Clock signal local internal.

                   01   Clock signal local external.

                  10    Clock signal remote.

   7, 6            00   Buffered asynchronous mode.

                   01   Asynchronous while in command mode, switch to
                        synchronous while in data mode.
                   10
                        Unbuffered asynchronous mode.
                  11
                        Synchronous mode.

                          BIT-MAPPED REGISTER S15

  Format:              AT [cmds] S15=n [cmds]

  Default:             130

  Range:               0 - 158

  Unit:                Bit-mapped

  Description:         Controls active profile and data format.

    Bit      Value                          Function

   1, 0           00   Use even parity.

                  01   Use odd parity.

                 10    Do not use parity.

     2             0   Use 1 stop bit.

                  1    Use 2 stop bit.

   4, 3           00   Use 10-bit characters.

                  01   Use 11-bit characters.

                  10   Use 9-bit characters.

                 11    Use 8-bit characters.

  7, 6, 5        000   Profile 0 active at power-up.

                 001   Profile 1 active at power-up.

                 010   Profile 2 active at power-up.

                 011   Profile 3 active at power-up.

                100    Factory defaults active at power-up.

                          BIT-MAPPED REGISTER S17

  Format:                AT [cmds] S17=n [cmds]

  Default:               18

  Range:                 0 - 191

  Unit:                  Bit-mapped

  Description:           Controls command set type, dialing mode, leased
                         line transmit attenuation, and secondary
                         networking channel.

    Bit       Value                          Function

     0               0   Secondary channel disabled.

                    1    Secondary channel enabled.

   4 - 1          0000   Sets leased line transmit attenuation level to
                         0dBm.
                   ...
                         ...
                  1001
                         Sets leased line transmit attenuation level to
                   ...   -9dBm.

                 1111    ...

                         Sets leased line transmit attenuation level to
                         -15dBm.

     5               0   Originate mode.

                    1    Answer mode.

   7, 6             00   AT command set enabled.

                    01   V25bis command set enabled.

                   10    Command sets disabled.

                          BIT-MAPPED REGISTER S21

  Format:              AT [cmds] S21=n [cmds]

  Default:             178

  Range:               0 - 255

  Unit:                Bit-mapped

  Description:         Controls DTR, CTS, CD, and DSR signals, speaker,
                       and error correction.

   Bit       Value                          Function

    0              0   Attempt an error-correcting connection. If that
                       fails, attempt a normal connection.
                  1
                       Attempt an error-correcting connection. If that
                       fails, hang up.

   2, 1           00   Speaker disabled.

                  01   Speaker enabled until carrier signal detected

                  10   Speaker enabled.

                 11    Speaker enabled following dialing, then disabled
                       after carrier signal detected.

    3              0   DSR forced high.

                  1    DSR normal.

    4              0   CD forced high.

                  1    CD normal.

    5              0   CTS follows RTS when in synchronous mode.

                  1    CTS forced high when in synchronous mode.

   7, 6           00   DTR is forced on.

                  01   Dial default number on high DTR; hang up on low
                       DTR.
                  10
                       Low DTR hangs up and returns to command mode.
                 11
                       Low DTR hangs up and resets the modem to profile
                       0.

                          BIT-MAPPED REGISTER S23

  Format:              AT [cmds] S23=n [cmds]

  Default:             105

  Range:               0 - 255

  Unit:                Bit-mapped

  Description:         Controls result codes, dialing, and echo.

    Bit      Value                          Function

     0             0   Command echoing disabled.

                  1    Command echoing enabled.

     1            0    Not used.

     2             0   Select pulse dial make/break ratio of 39/61ms at
                       10pps (North America).
                  1
                       Select pulse dial make/break ratio of 33/67ms at
                       10pps (Europe).

  5, 4, 3        000   Basic result codes only enabled.

                 001   Basic and connection speed result codes enabled.

                 010   Basic and connection speed result codes and
                       dialtone detection enabled.
                 011
                       All result codes except dialtone detection
                 100   enabled.

                 101   All result codes enabled.

                 110   All result codes plus DTE speed and error control
                       level enabled.
                111
                       All result codes plus ARQ enabled.

                       All result codes plus ARQ and error control level
                       enabled.

     6             0   Display result codes in numeric form.

                  1    Display result codes in long form.

     7             0   Result codes enabled.

                  1    Result codes disabled.

                          BIT-MAPPED REGISTER S24

  Format:              AT [cmds] S24=n [cmds]

  Default:             138

  Range:               0 - 238

  Unit:                Bit-mapped

  Description:         Controls speaker volume and ring volume.

    Bit      Value                          Function

     0            0    Not used.

  3, 2, 1        000   Ring volume off.

                 001   Ring volume low.

                 100   ...

                111    Ring volume medium.

                       ...

                       Ring volume high.

     4            0    Not used.

  7, 6, 5        000   Speaker volume off.

                 001   Speaker volume low.

                 100   ...

                 101   Speaker volume medium.

                111    ...

                       Speaker volume high.

                          BIT-MAPPED REGISTER S27

  Format:              AT [cmds] S27=n [cmds]

  Default:             156

  Range:               0 - 228

  Unit:                Bit-mapped

  Description:         Controls reaction to poor signal quality, flow
                       control, and error correction.

    Bit      Value                          Function

  2, 1, 0        000   Error correction disabled for fax/modem.

                 001   MNP4 enabled for fax/modem.

                 010   MNP5 enabled for fax/modem.

                 011   V.42 and MNP4 enabled for fax/modem.

                100    V.42bis and MNP5 enabled for fax/modem.

  5, 4, 3        000   Flow control disabled.

                 011   Hardware flow control enabled.

                100    Software flow control enabled.

   7, 6           00   Modem does nothing during poor signal quality.

                  01   Modem retrains during poor signal quality.

                  10   Modem fall-back during poor signal quality, and
                       fall-forward when signal improves.
                 11
                       Modem will disconnect during poor signal quality.

                          BIT-MAPPED REGISTER S28

  Format:                AT [cmds] S28=n [cmds]

  Default:               68

  Range:                 0 - 235

  Unit:                  Bit-mapped

  Description:           Controls front panel lock, break type, guard
                         tone, local serial port speed lock, and 1200bps
                         protocol.

   Bit        Value                         Function

    0               0    Not used.

    1                0   Panel key unlocked.

                    1    Panel key locked.

   3, 2             00   Destructive break sent ahead of data stream.

                    01   Non-destructive break sent ahead of data stream.

                   10    Non-destructive break sent at end of data
                         stream.

   5, 4             00   Guard tone disabled.

                   10    Guard tone enabled.

    6                0   Local serial port speed follows connect speed.

                    1    Local serial port speed locked.

    7                0   Sets V.22 as 1200bps protocol.

                    1    Sets Bell 212/A as 1200bps protocol.

                          BIT-MAPPED REGISTER S35

  Format:                AT [cmds] S35=n [cmds]

  Default:               32

  Range:                 0 - 255

  Unit:                  Bit-mapped

  Description:           Controls 4800bps V.32, handshake interruption,
                         V.26bis mode, leased line transmission
                         attenuation, Selective Reject, password
                         protection, and extended result codes.

   Bit        Value                          Function

    0                0   4800bps V.32 normal.

                    1    Use ZyCELL 4800bps trellis coded instead of
                         4800bps V.32.

    1                0   Handshake can be interrupted.

                    1    Handshake cannot be interrupted.

    2                0   V.26bis normal.

                    1    V.26bis mode A.

    3                0   Leased line transmission level normal.

                    1    Leased line transmission is attenuated by
                         -12dBm.

    4                0   Modem will not dial default number when
                         Data/Voice button is pressed
                    1
                         Modem will dial default number when Data/Voice
                         button is pressed

    5                0   V.42 Selective Reject disabled.

                    1    V.42 Selective Reject enabled.

    6                0   Profile password protection disabled.

                    1    Profile password protection enabled.

    7                0   Connection speed result codes disabled on error
                         correcting connection.
                    1
                         Connection speed result codes enabled on error
                         correcting connection.

                          BIT-MAPPED REGISTER S36

  Format:               AT [cmds] S36=n [cmds]

  Default:              0

  Range:                0 - 163

  Unit:                 Bit-mapped

  Description:          Controls security and remote profiles.

   Bit       Value                          Function

    0               0   Deny remote request for current configuration.

                   1    Grant remote request for current configuration.

    1               0   Copies local profile to remote profile. Profiles
                        set with S37.
                   1
                        Copies remote profile to local profile. Profiles
                        set with S37.

   4-2           000    Not used.

  7, 6, 5         000   Security disabled.

                  001   Security type I and password check enabled.

                  010   Security type I, callback, and password check
                        enabled.
                  011
                        Security type II and password check enabled.
                  100
                        Security type II, callback, and password check
                 101    enabled.

                        Security type II, callback, and password check
                        enabled. Callback number sent by remote.

                          BIT-MAPPED REGISTER S38

  Format:          AT [cmds] S38=n [cmds]

  Default:         0

  Range:           0 - 57

  Unit:            Bit-mapped

  Description:     Controls auto-dial, CD signal, fax auto-answer, and
                   MNP5.

   Bit    Value                           Function

    0          0   Auto-dial of default number disabled.

              1    Auto-dial of default number enabled.

   2-1       00    Not used.

    3          0   CD normal.

              1    CD according to UNIX standard.

    4          0   Fax auto-answer enabled.

              1    Fax auto-answer disabled.

    5          0   MNP5 enabled.

              1    MNP5 disabled.

                          BIT-MAPPED REGISTER S39

  Format:               AT [cmds] S39=n [cmds]

  Default:              0

  Range:                0 - 252

  Unit:                 Bit-mapped

  Description:          Controls answer mode, Class 2 fax modes, V.26bis
                        scrambler, DTMF detection, and resync info.

   Bit       Value                          Function

   1-0            00    Not used.

    2               0   Answer in answer mode.

                   1    Answer in originate mode.

    3               0   Normal Class 2 fax.

                   1    Bitfax-compatible Class 2 fax.

    4               0   Normal Class 2 fax.

                   1    Local serial port speed shift for Class 2 fax.

    5               0   V.26bis scrambler enabled.

                   1    V.26bis scrambler disabled.

    6               0   DTMF detection in voice mode only.

                   1    DTMF detection on AT+VLS=2 command.

    7               0   Resync information not included in ADPCM voice
                        file.
                   1
                        Resync information included in ADPCM voice file.

                          BIT-MAPPED REGISTER S40

  Format:          AT [cmds] S40=n [cmds]

  Default:         0

  Range:           0 - 126

  Unit:            Bit-mapped

  Description:     Controls extended ring detection and result codes.

   Bit    Value                           Function

    0         0    Not used.

    1          0   Modem returns result codes.

              1    Modem does not return result codes.

    2          0   Caller ID disabled.

              1    Caller ID enabled.

    3          0   Ring type 1 detection disabled.

              1    Ring type 1 detection enabled.

    4          0   Ring type 2 detection disabled.

              1    Ring type 2 detection enabled.

    5          0   Ring type 3 detection disabled.

              1    Ring type 3 detection enabled.

    6          0   Ring type 4 detection disabled.

              1    Ring type 4 detection enabled.

    7         0    Not used.

                          BIT-MAPPED REGISTER S41

  Format:                AT [cmds] S41=n [cmds]

  Default:               0

  Range:                 0 - 255

  Unit:                  Bit-mapped

  Description:           Controls MNP compatibility mode, V.25bis idle,
                         retrain timeout, loopback tests, blind dial
                         time, DSR signal, S0 register, and calling tone.

   Bit        Value                          Function

    0                0   MNP compatibility mode disabled.

                    1    MNP compatibility mode enabled.

    1                0   Use flag for V.25bis idle.

                    1    Use mark for V.25bis idle.

    2                0   Retrain timeout normal.

                    1    Retrain timeout set to 5 minutes.

    3                0   Loopback test signals disabled.

                    1    Loopback test signals enabled.

    4                0   Modem waits for dial tone before dialing.

                    1    Modem waits for time set in S6 and then
                         blind-dials.

    5                0   DSR normal.

                    1    DSR follows CD and goes low for 1/2 second on
                         loss of carrier.

    6                0   Register S0 behaves normally.

                    1    Force S0 to be greater than 2.

    7                0   Respond to calling tone.

                    1    Ignore calling tone.

                          BIT-MAPPED REGISTER S42

  Format:                AT [cmds] S42=n [cmds]

  Default:               0

  Range:                 0 - 255

  Unit:                  Bit-mapped

  Description:           Controls secondary channel speed, throughput
                         averaging, Caller ID display, escape sequence,
                         V.17 mode, data/voice switch, and CD signal.

    Bit       Value                          Function

     0                0  Secondary channel 2400/75bps.

                     1   Secondary channel 2400bps.

     1                0  Throughput averaging disabled.

                     1   Throughput averaging enabled.

     2                0  Caller ID information will be displayed even if
                         ATQ2 is set.
                     1
                         Caller ID information will not be displayed if
                         ATQ2 is set.

     3                0  Escape sequence enabled in answer mode.

                     1   Escape sequence disabled in answer mode.

     4                0  V.17 enabled.

                     1   Disable V.17 in originate mode.

     5                0  Data/Voice switch enabled.

                     1   Data/Voice switch disabled.

     6                0  Enable RING result.

                     1   Disable RING result.

     7                0  CD forced high.

                     1   CD pulses off at carrier loss.

                          BIT-MAPPED REGISTER S44

  Format:               AT [cmds] S44=n [cmds]

  Default:              0

  Range:                0 - 124

  Unit:                 Bit-mapped

  Description:

   Bit        Value                         Function

   1-0             00   Not used.

    2                0  Dial backup executed automatically.

                    1   Dial backup waits for panel input.

    3                0  Cyclic dial disabled.

                    1   Cyclic dial enabled.

    4                0  DSR normal.

                    1   DSR follows DTR.

    5                0  V.13 simulation disabled.

                    1   V.13 simulation enabled.

    6                0    &B0          Local serial port speed determined
                                       normally.
                    1     &B1
                                       Local serial port is locked at
                                       19.2Kbps if link is 9600bps or
                                       faster, at 9600bps if link is
                                       7200bps, and else at link speed.

                                       Local serial port locked if ARQ
                                       link, and follows link speed
                                       otherwise.

                          BIT-MAPPED REGISTER S48

  Format:                AT [cmds] S48=n [cmds]

  Default:               0

  Range:                 0 - 61

  Unit:                  Bit-mapped

  Description:           Controls caller ID format, call answering,
                         calling tone, V.23 speed, DTR change action, and
                         protocol negotiation.

    Bit       Value                          Function

     0               0   Caller ID displayed normally.

                    1    Caller ID displayed as raw data.

     1               0   Answer all incoming calls.

                    1    Answer data calls only.

     2               0   Calling tone disabled.

                    1    Calling tone enabled.

     3               0   V.23 speed set to 1200/75.

                    1    V.23 speed set to 75/1200.

     4               0   Modem does nothing on DTR change.

                    1    Modem will dial default number on high DTR and
                         disconnect and reset on low DTR.

     5               0   Modem will negotiate all protocols.

                    1    Modem will not negotiate protocols faster than
                         9600bps.

                          BIT-MAPPED REGISTER S52

  Format:          AT [cmds] S52=n [cmds]

  Default:         0

  Range:           0 - 144

  Unit:            Bit-mapped

  Description:     Controls received signal level and initial V.23
                   handshake signal.

   Bit    Value                           Function

   2-0      000    Not used.

  4, 3        00   Adjust received signal to -43dBm.

              01   Adjust received signal to -33dBm.

             10    Adjust received signal to -26dBm.

   6-5       00    Not used.

    7          0   First signal of V.23 handshake is Mark.

              1    First signal of V.23 handshake is Space.

                          BIT-MAPPED REGISTER S57

  Format:          AT [cmds] S57=n [cmds]

  Default:         16

  Range:           0 - 80

  Unit:            Bit-mapped

  Description:     Controls fax class 1 and busy detection during
                   dialing.

   Bit    Value                           Function

   3-0     0000    Not used.

    4          0   Fax class 1 disabled.

              1    Fax class 1 enabled.

    5         0    Not used.

    6          0   Busy detection disabled during dialing.

              1    Busy detection enabled during dialing.

                          BIT-MAPPED REGISTER S84

  Format:               AT [cmds] S84=n [cmds]

  Default:              0

  Range:                0 - 255

  Unit:                 Bit-mapped

  Description:          Controls register value format, caller ID
                        information reporting, and serial port mode.

    Bit      Value                          Function

    2-0          000    Not used.

     3              0   Display register values in decimal.

                   1    Display register values in hexadecimal.

     4              0   Caller ID information display enabled.

                   1    Caller ID information display disabled.

    6-5           00    Not used.

     7              0   Serial port in single-stream mode.

                   1    Serial port in multistream mode.

                                BREAK TYPE

  Type:          Configuration

  Format:        AT [cmds] &Yn [cmds]

  Description:   Configures action of break signal.

    Command                              Function

      &Y0        Break empties buffer and is sent immediately.

      &Y1        Break does not empty buffer and is sent immediately.

      &Y2        Break does not empty buffer and is sent in data stream.

                          CALLBACK NUMBER DISPLAY

  Type:            Immediate

  Format:          AT [cmds] *VC [cmds]

  Description:     Displays the table of callback numbers.

  Note:            The supervisor password must be entered to execute
                   this command.

                           CALLER ID INFORMATION

  Type:          Immediate

  Format:        AT [cmds] *T [cmds]

  Description:   Displays the last caller ID information.

                          CALLER ID SILENCE DELAY

  Type:           Register

  Format:         AT [cmds] S45=n [cmds]

  Default:        87

  Range:          0-255

  Unit:           20ms

  Description:    Time period in which Caller ID silence detection is
                  disabled.

                        CALLER ID SILENCE DETECTION

  Type:                  Register

  Format:                AT [cmds] S46=n [cmds]

  Default:               3

  Range:                 0-255

  Unit:                  20ms

  Description:           Time period for which silence must be detected
                         for Called ID information to be processed.

                               CELLULAR MODE

  Format:          AT [cmds] S49=n [cmds]

  Default:         9

  Range:           0 - 255

  Unit:            Bit-mapped

  Description:     Controls cellular transmission attenuation and
                   cellular function.

   Bit     Value                          Function

  3 - 0      0000  Sets cellular transmit attenuation level to -9dBm.

              ...  ...

             1001  Sets cellular transmit attenuation level to -18dBm.

              ...  ...

            1111   Sets cellular transmit attenuation level to -24dBm.

   6-4       000   Not used.

    7           0  Cellular mode over phone lines.

               1   Cellular mode through cellular phone.

                             CHARACTER LENGTH

  Type:          Configuration

  Format:        AT [cmds] *Cn [cmds]

  Description:   Sets length of character.

    Command                              Function

      *C0        Set 10-bit character.

      *C1        Set 11-bit character.

      *C2        Set 9-bit character.

      *C3        Set 8-bit character.

                             COMMAND MODE TYPE

  Type:           Configuration

  Format:         AT [cmds] *In [cmds]

  Description:    Selects the command set the modem will use.

    Command                              Function

      *I0         AT command set enabled.

      *I1         V.25bis command set enabled.

      *I2         Dumb terminal mode, all command sets disabled.

            Note: To leave dumb terminal mode, front panel menu must be
            used.

                   COMPRESSION AND ERROR CORRECTION MODE

  Type:            Configuration

  Format:          AT [cmds] &Kn [cmds]

  Description:     Selects the type of error correction and data
                   compression used.

     Command                              Function

       &K0         Error correction and compression disabled for
                   switched-line calls.

       &K1         MNP4 enabled for switched-line calls.

       &K2         MNP5 enabled for switched-line calls.

       &K3         V.42 and MNP4 enabled for switched-line calls.

       &K4         V.42bis and MNP5 enabled for switched-line calls.

                          CONFIGURATION PROFILES

  Type:          Immediate

  Format:        AT [cmds] &Vn [cmds]

  Description:   Displays active and stored configuration profiles.

    Command                              Function

      &V0        Displays current settings.

      &V1        Displays profile 0.

      &V2        Displays profile 1.

      &V3        Displays profile 2.

      &V4        Displays profile 3.

      &V5        Displays factory defaults.

                       DEFAULT FALLBACK PHONE NUMBER

  Type:                   Register

  Format:                 AT [cmds] S30=n [cmds]

  Default:                0

  Range:                  0-39

  Unit:                   N/A

  Description:            Sets the default phone number the phone will
                          dial when leased line goes down to memory
                          location n. Setting S30 to 0 will disable this
                          feature.

                           DEFAULT PHONE NUMBER

  Type:          Configuration

  Format:        AT [cmds] *Dn [cmds]

  Default:       0

  Range:         0-39

  Unit:          N/A

  Description:   Sets the default phone number to memory location n.

                           DEFAULT PHONE NUMBER

  Type:          Register

  Format:        AT [cmds] S29=n [cmds]

  Default:       0

  Range:         0-39

  Unit:          N/A

  Description:   Sets the default phone number to memory location n.

                              DES ENCRYPTION

  Format:          AT [cmds] S89=n [cmds]

  Default:         0

  Range:           0 - 255

  Unit:            Bit-mapped

  Description:     Controls DES encryption settings.

   Bit    Value                           Function

    0          0   DES encryption disabled.

              1    DES encryption enabled.

    1          0   Attempt single DES only.

              1    Attempt triple DES.

    2          0   Public key system enabled. Modem will generate key.

              1    Public key system disabled. User must enter key.

    3          0   Keep non-encrypted connection.

              1    Disconnect from non-encrypted connection.

                                DES KEY SET

  Type:                  Configuration

  Format:                AT [cmds] CKxxxx [cmds]

  Description:           Sets the key to be used for DES encryption. The
                         key must be between 15 and 65 characters.

                                DIAGNOSTICS

  Type:          Immediate

  Format:        AT [cmds] CGn [cmds]

  Description:   Performs modem diagnostics.

                                   DIAL

  Type:                   Immediate

  Format:                 AT [cmds] D<#> [; cmds]

  Description:            Dials telephone number according to any
                          modifiers included in the string.

        Modifier                             Function

           DP             Dial in pulse mode.

           DR             Dial in answer mode.

          DS=n            Number in memory location n dialed.

           DT             Dial in tone mode.

           DW             Dialing resumed following dial tone detection.

           D,             Dialing paused for amount of time specified in
                          S8 register.

           D!             Flash function initiated. Modem commanded to go
                          on-hook for specified time.

           D@             Modem waits for a ring-back signal followed by
                          silence up to the time specified in S7 prior to
                          executing the rest of the dial string.

           D;             Modem returned to idle state after dialing. The
                          semicolon can only be placed at the end of the
                          dial command.

                                DIAL BACKUP

  Type:                 Configuration

  Format:               AT [cmds] *Bn [cmds]

  Description:          Selects the memory location for the dial backup.
                        *B or *B0 will disable dial backup.

                       DISPLAY STORED PHONE NUMBERS

  Type:          Immediate

  Format:        AT [cmds] &Z? [cmds]

  Description:   Displays all stored phone numbers.

                           ERROR CONTROL FAILURE

  Type:                Configuration

  Format:              AT [cmds] *En [cmds]

  Description:         Configures the modems behavior if an
                       error-connecting connection cannot be made.

       Command                              Function

         *E0           Modem will keep non-error-correcting connection.

         *E1           Modem will disconnect non-error-correcting
                       connection.

                               EXTENDED RING

  Format:           AT [cmds] S51=n [cmds]

  Default:          0

  Range:            0 - 255

  Unit:             Bit-mapped

  Description:      Sets operation of modem when it detects extended
                    rings and fax rings.

   Bit     Value                          Function

  1, 0         00   Extended ring tone detection disabled.

               01   Extended ring tone returns RING n twice.

               10   Extended ring tone returns RING n four times.

              11    Extended ring tone returns RING n six times.

  3, 2         00   DTMF detection disabled.

               01   DTMF tone returns RING n twice.

              10    DTMF tone returns RING <digit>.

  5, 4         00   Fax ring tone detection disabled.

               01   Fax ring tone returns RING.

               10   Fax ring tone returns RING 1.

              11    Fax ring tone returns RING 2.

  7, 6         00   Data ring tone detection disabled.

               01   Data ring tone returns RING.

               10   Data ring tone returns RING 1.

              11    Data ring tone returns RING 3.

                                FAX CONNECT

  Type:             Result code

  Format:           CONNECT FAX/SnnnnVaTbRcLxCyP<#>

  Example:          CONNECT FAX/S1440V1T1R0L1C0P(303) 555-1212

  Description:      Returned by the modem when a successful fax
                    connection has been made.

     Response                              Meaning

      S2400         2400bps connection.

      S4800         4800bps connection.

      S7200         7200bps connection.

      S9600         9600bps connection.

      S1200         12Kbps connection.

      S1440         14.4Kbps connection.

        V0          Normal vertical resolution.

        V1          High vertical resolution.

        T0          One-dimensional coding scheme.

        T1          Two-dimensional coding scheme.

        R0          215mm wide (1728 pels).

        R1          255mm wide (2048 pels).

        R2          303mm wide (2432 pels).

                            FAX CONNECT (CONT)

     Response                              Meaning

        L0           A4 length (297mm).

        L1           B4 length (364mm).

        L2           Unlimited length.

        C0           20ms minimum per line.

        C1           5ms minimum per line.

        C2           10ms minimum per line.

        C3           20ms minimum per normal-resolution line, 10ms
                     minimum per fine-resolution line.

        C4           40ms minimum per line.

        C5           40ms minimum per normal-resolution line, 20ms
                     minimum per fine-resolution line.

        C6           10ms minimum per normal-resolution line, 5ms minimum
                     per fine-resolution line.

        C7           No minimum time required.

       P<#>          Remote fax station number.

                              FAX DISCONNECT

  Type:           Result code

  Format:         DISCONNECTn P<#>

  Example:        DISCONNECT1P(303) 555-1212

  Description:    Returned by the modem when the fax connection has been
                  broken.

    Response                              Meaning

   DISCONNECT0    Remote modem has confirmed disconnection.

   DISCONNECT1    Remote modem has not confirmed disconnection.

      P<#>        Remote fax station number.

                               FAX ENCODING

  Type:          Configuration

  Format:        AT [cmds] #Tn [cmds]

  Description:   Sets the encoding scheme of transmitted faxes.

    Command                              Function

      #T0        Sets one-dimensional encoding.

      #T1        Sets two-dimensional encoding.

                                FAX LENGTH

  Type:          Configuration

  Format:        AT [cmds] #Ln [cmds]

  Description:   Sets the length of transmitted faxes.

    Command                              Function

      #L0        A4 length (297mm).

      #L1        B4 length (364mm).

      #L2        Unlimited length.

                  FAX MINIMUM SCAN LINE TRANSMISSION TIME

  Type:                Configuration

  Format:              AT [cmds] #Cn [cmds]

  Description:         Sets the minimum time required for transmission of
                       one scan line.

       Command                             Function

         #C0           20ms minimum per line.

         #C1           5ms minimum per line.

         #C2           10ms minimum per line.

         #C3           20ms minimum per normal-resolution line, 10ms
                       minimum per fine-resolution line.

         #C4           40ms minimum per line.

         #C5           40ms minimum per normal-resolution line, 20ms
                       minimum per fine-resolution line.

         #C6           10ms minimum per normal-resolution line, 5ms
                       minimum per fine-resolution line.

         #C7           No minimum time required.

                                 FAX MODE

  Type:          Immediate

  Format:        AT [cmds] #F [cmds]

  Description:   Sets modem in fax mode.

                         FAX ORIGINATE/ANSWER MODE

  Type:          Register

  Format:        AT [cmds] S80=n [cmds]

  Description:   Selects originate/answer for fax mode.

    Command                              Function

     S80=0        Fax/modem operates in originate mode.

     S80=1        Fax/modem operates in answer mode.

                            FAX RECEIVE DEVICE

  Type:              Configuration

  Format:            AT [cmds] +FZF=n [cmds]

  Description:       Selects where the modem will store and send received
                     fax and modem data.

      Command                              Function

      +FZF=0         Send fax data to printer and hang up if modem data.

      +FZF=1         Send fax data to printer and modem data to serial
                     port.

      +FZF=2         Send fax data to DRAM and printer, and hang up if
                     modem data.

      +FZF=3         Send fax data to DRAM and hang up if modem data.

      +FZF=4         Send fax data to DRAM and printer, and hang up if
                     modem data.

      +FZF=5         Send fax data to DRAM and modem data to serial port.

                            FAX RECEIVE DEVICE

  Type:              Register

  Format:            AT [cmds] S71=n [cmds]

  Description:       Selects where the modem will store and send received
                     fax and modem data.

      Command                              Function

       S71=0         Send fax data to printer and hang up if modem data.

       S71=1         Send fax data to printer and modem data to serial
                     port.

       S71=2         Send fax data to DRAM and printer, and hang up if
                     modem data.

       S71=3         Send fax data to DRAM and hang up if modem data.

       S71=4         Send fax data to DRAM and printer, and hang up if
                     modem data.

       S71=5         Send fax data to DRAM and modem data to serial port.

                             FAX RECEIVE MODE

  Type:               Configuration

  Format:             AT [cmds] #Bn [cmds]

  Description:        Configures the operation of the modem when
                      receiving faxes.

      Command                              Function

        #B0           Fax data follows immediately after connection
                      parameters.

        #B1           Fax data is separated from connection parameters by
                      DC2 (ASCII 24) character.

        #B2           Fax data is not transmitted until receiving modem
                      requests it.

        #B3           Displays the fax ring pattern

                              FAX RESOLUTION

  Type:          Configuration

  Format:        AT [cmds] #Vn [cmds]

  Description:   Sets the vertical resolution of transmitted faxes.

    Command                              Function

      #V0        Sets normal resolution.

      #V1        Sets high resolution.

                         FAX STATION PHONE NUMBER

  Type:               Configuration

  Format:             AT [cmds] #P<#> [cmds]

  Description:        Sets what the modem will report as its phone number
                      to the remote fax machine.

                          FAX/VOICE FLOW CONTROL

  Type:           Configuration

  Format:         AT [cmds] +FLO=n [cmds]

  Description:    Selects the type of flow control to use for voice/fax
                  modes.

    Command                              Function

     +FLO=0       Flow control disabled.

     +FLO=1       Software flow control enabled.

     +FLO=2       Hardware flow control enabled.

                                 FAX WIDTH

  Type:          Configuration

  Format:        AT [cmds] #Rn [cmds]

  Description:   Sets the width of transmitted faxes.

    Command                              Function

      #R0        215mm wide (1728 pixels).

      #R1        255mm wide (2048 pixels).

      #R2        303mm wide (2432 pixels).

                             FIRMWARE DOWNLOAD

  Type:          Immediate

  Format:        AT [cmds] UPX

  Description:   Begins an XMODEM download to the modem firmware.

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] &Hn [cmds]

  Description:   Selects the type of flow control to use.

    Command                              Function

      &H0        Flow control disabled.

      &H3        Hardware flow control enabled.

      &H4        Software flow control enabled.

                               HELP SCREENS

  Type:                   Immediate

  Format:                 AT <prefix>$

  Example:                AT *$<CR>

  Description:            Shows command help screens for all commands
                          beginning with the given prefix, or no prefix
                          if none is given.

        Command                              Function

           $              Shows ATx help screen.

           &$             Shows AT&x help screen.

           *$             Shows AT*x help screen.

           S$             Shows S-register help screen.

                              HOOK FLASH TIME

  Type:             Register

  Format:           AT [cmds] S56=n [cmds]

  Default:          Unidentified

  Range:            0-255

  Unit:             10ms

  Description:      Selects the amount of time the modem goes on-hook for
                    a hook flash.

                             INACTIVITY TIMER

  Type:                  Register

  Format:                AT [cmds] S50=n [cmds]

  Default:               Unidentified

  Range:                 0-255

  Unit:                  10 seconds

  Description:           Sets the length of time that the modem does not
                         receive information before it disconnects.

                        LEASED-LINE AUTO-HANDSHAKE

  Type:          Configuration

  Format:        AT [cmds] *Mn [cmds]

  Description:   Selects which modem performs the auto-handshaking.

    Command                              Function

      *M0        Originating modem auto-handshakes.

      *M1        Answering modem auto-handshakes.

                          LEASED LINE RETRY TIME

  Type:                  Register

  Format:                AT [cmds] S34=n [cmds]

  Default:               30

  Range:                 0-255

  Unit:                  1 minute

  Description:           When leased line is down, sets the time between
                         checks on whether it is functioning again.

                   LEASED-LINE TRANSMISSION ATTENUATION

  Type:            Configuration

  Format:          AT [cmds] *Pn [cmds]

  Default:         9

  Range:           0 - 15

  Unit:            -1 dBm

  Description:     Sets the attenuation for transmission when in
                   leased-line mode.

                                 LINE TYPE

  Type:          Configuration

  Format:        AT [cmds] &Ln [cmds]

  Description:   Selects line type.

    Command                              Function

      &L0        Switched line.

      &L1        2-wire leased line.

      &L2        4-wire leased line.

                   LOCAL/REMOTE CONFIGURATION SELECTION

  Format:              AT [cmds] S37=n [cmds]

  Default:             0

  Range:               0 - 127

  Unit:                Bit-mapped

  Description:         Selects local and remote profiles for copying.

    Bit      Value                          Function

  2, 1, 0        000   Select local profile 0.

                 001   Select local profile 1.

                 010   Select local profile 2.

                 011   Select local profile 3.

                 100   Select current local configuration.

                101    Select local factory defaults.

     3            0    Not used.

  6, 5, 4        000   Select remote profile 0.

                 001   Select remote profile 1.

                 010   Select remote profile 2.

                 011   Select remote profile 3.

                 100   Select current remote configuration.

                101    Select remote factory defaults.

                          LOCAL SERIAL PORT SPEED

  Type:          Register

  Format:        AT [cmds] S20=n [cmds]

  Range:         0 - 46

  Description:   Sets serial port speed.

     Value                               Meaning

       0         Sets 230.4Kbps speed.

       1         Sets 115.2Kbps speed.

       2         Sets 76.8Kbps speed.

       3         Sets 57.6Kbps speed.

       4         Sets 38.4Kbps speed.

       5         Sets 19.2Kbps speed.

       6         Sets 16.8Kbps speed.

       7         Sets 14.4Kbps speed.

       8         Sets 12Kbps speed.

       9         Sets 9600bps speed.

       10        Sets 7200bps speed.

       11        Sets 4800bps speed.

       12        Sets 2400bps speed.

       13        Sets 1200bps speed.

       14        Sets 460.8Kbps speed.

       15        Sets 300bps speed.

       16        Sets 307.2Kbps speed.

       17        Sets 153.6Kbps speed.

       18        Sets 102.4Kbps speed.

       20        Sets 61.4Kbps speed.

       21        Sets 51.2Kbps speed.

      LOCAL SERIAL PORT SPEED (CONT)

  Value               Meaning

   22     Sets 624Kbps speed.

   24     Sets 124.8Kbps speed.

   25     Sets 62.4Kbps speed.

   26     Sets 41.6Kbps speed.

   28     Sets 24.9Kbps speed.

   29     Sets 20.8Kbps speed.

   46     Sets 921.6Kbps speed.

                  LOCAL SERIAL PORT SPEED ON AUTO-ANSWER

  Type:            Register

  Format:          AT [cmds] S18=n [cmds]

  Range:           0 - 46

  Description:     Sets serial port speed when modem auto-answers an
                   incoming call.

      Value                               Meaning

        0          Auto-detect speed.

        1          Sets 115.2Kbps speed.

        2          Sets 76.8Kbps speed.

        3          Sets 57.6Kbps speed.

        4          Sets 38.4Kbps speed.

        5          Sets 19.2Kbps speed.

        6          Sets 16.8Kbps speed.

        7          Sets 14.4Kbps speed.

        8          Sets 12Kbps speed.

        9          Sets 9600bps speed.

       10          Sets 7200bps speed.

       11          Sets 4800bps speed.

       12          Sets 2400bps speed.

       13          Sets 1200bps speed.

       14          Sets 460.8Kbps speed.

       15          Sets 300bps speed.

       16          Sets 307.2Kbps speed.

       17          Sets 153.6Kbps speed.

       18          Sets 102.4Kbps speed.

       20          Sets 61.4Kbps speed.

       21          Sets 51.2Kbps speed.

       22          Sets 624Kbps speed.

       24          Sets 124.8Kbps speed.

       25          Sets 62.4Kbps speed.

       26          Sets 41.6Kbps speed.

       28          Sets 24.9Kbps speed.

       29          Sets 20.8Kbps speed.

       32          Sets 230.4Kbps speed.

       46          Sets 921.6Kbps speed.

           LOCAL SERIAL PORT SPEED ON AUTO-ANSWER (U-1496 MODE)

  Type:            Register

  Format:          AT [cmds] S18=n [cmds]

  Default:         2

  Range:           0 - 15

  Unit:            N/A

  Description:     Sets serial port speed when modem auto-answers an
                   incoming call.

  Note:            This table should be used when in U-1496 compatible
                   mode only.

      Value                               Meaning

        0          Sets 76.8Kbps speed.

        1          Sets 57.6Kbps speed.

        2          Sets 38.4Kbps speed.

        3          Sets 19.2Kbps speed.

        4          Sets 16.8Kbps speed.

        5          Sets 14.4Kbps speed.

        6          Sets 12Kbps speed.

        7          Sets 9600bps speed.

        8          Sets 7200bps speed.

        9          Sets 4800bps speed.

       10          Sets 3600bps speed.

       11          Sets 2400bps speed.

       12          Sets 1800bps speed.

       13          Sets 1200bps speed.

       14          Sets 600bps speed.

       15          Sets 300bps speed.

                           MANUFACTURER CAPTURE

  Type:                  Register

  Format:                AT [cmds] S13=n [cmds]

  Default:               0

  Range:                 0, 2

  Unit:                  N/A

  Description:           Selects whether to attempt to capture the
                         manufacturer of the other modem during
                         handshaking.

        Command                              Function

         S13=0           Manufacturer capture disabled.

         S13=2           Manufacturer capture enabled.

                              MODE SELECTION

  Type:             Immediate

  Format:           AT [cmds] +FCLASS=n

  Description:      Sets what mode the modem will operate in.

     Command                              Function

    +FCLASS=0       Data mode.

    +FCLASS=1       Class 1 fax mode.

    +FCLASS=2       Class 2 fax mode.

   +FCLASS=2.0      Class 2.0 fax mode.

    +FCLASS=6       ZyXELfax mode.

    +FCLASS=8       Voice mode.

    +FCLASS=Z       Parallel port fax mode. Sends fax data to printer on
                    parallel port.

                              MODE SELECTION

  Type:          Register

  Format:        AT [cmds] S85=n

  Description:   Sets what mode the modem will operate in.

    Command                              Function

     S85=0       Data mode.

     S85=1       Class 1 fax mode.

     S85=2       Class 2 fax mode.

     S85=6       ZyXELfax mode.

     S85=8       Voice mode.

                                 PANEL KEY

  Type:          Configuration

  Format:        AT [cmds] *Ln [cmds]

  Description:   Locks the front panel key.

    Command                              Function

      *L0        Key unlocked.

      *L1        Key locked.

                          PASSWORD FOR SUPERVISOR

  Type:             Immediate

  Format:           AT [cmds] *HS

  Description:      Changes supervisory password. Requires current
                    supervisory password.

                              PASSWORD TABLE

  Type:              Immediate

  Format:            AT [cmds] *Hn

  Description:       Changes password for phone book entry n. Requires
                     supervisory password.

                          PASSWORD TABLE DISPLAY

  Type:            Immediate

  Format:          AT [cmds] *V [cmds]

  Description:     Displays the password table.

  Note:            The supervisor password must be entered to execute
                   this command.

                       POOR SIGNAL QUALITY REACTION

  Type:                Configuration

  Format:              AT [cmds] *Qn [cmds]

  Description:         Configures the modems reaction to poor signal
                       quality.

       Command                              Function

         *Q0           Modem does nothing during poor signal quality.

         *Q1           Modem retrains during poor signal quality.

         *Q2           Modem fall-back during poor signal quality, and
                       fall-forward when signal improves.

         *Q3           Modem will disconnect during poor signal quality.

                               PRINT OPTIONS

  Format:          AT [cmds] S73=n [cmds]

  Default:         24

  Range:           0 - 47

  Unit:            Bit-mapped

  Description:     Sets options for printer.

   Bit    Value                           Function

    0          0   Printer connected to parallel port.

              1    Printer connected to serial port.

    1          0   Fast PCL mode enabled.

              1    Fast PCL mode disabled.

    2          0   Set printer resolution to 300dpi.

              1    Set printer resolution to 150dpi.

    3          0   Do not resize faxes to fit page.

              1    Resize faxes to fit page.

  5, 4        00   Select letter-size paper.

              01   Select legal-size paper.

             10    Select A4-size paper.

                            PRINT STORED FAXES

  Type:           Immediate

  Format:         AT [cmds] +FZP=n [cmds]

  Description:    Prints faxes that have been stored in DRAM but not
                  printed.

                            PRINTER PAPER SIZE

  Type:          Configuration

  Format:        AT [cmds] +FZS=n [cmds]

  Description:   Sets the paper size n the printer.

    Command                              Function

     +FZS=0      Select letter-size paper.

     +FZS=1      Select legal-size paper.

     +FZS=2      Select A4-size paper.

                            PRINTER RESOLUTION

  Type:          Configuration

  Format:        AT [cmds] +FZR=n [cmds]

  Description:   Sets the resolution to print on the printer.

    Command                              Function

     +FZR=0      Set printer resolution to 300dpi.

     +FZR=1      Set printer resolution to 150dpi.

                               PRINTER TYPE

  Format:          AT [cmds] S72=n [cmds]

  Default:         Unidentified

  Range:           0 - 4

  Unit:            Bit-mapped

  Description:     Sets options for printer.

   Bit    Value                           Function

    0          0   Use Deskjet 500 and Laserjet II series PCL.

              1    Use Laserjet III series and higher PCL.

    1          0   PCL mode enabled.

              1    PostScript Level I mode enabled.

                   PROTOCOL/SPEED - SWITCHED/LEASED LINE

  Type:              Configuration

  Format:            AT [cmds] &Nn [cmds]

  Description:       Selects the current protocol and speed for switched
                     and leased-line calls.

      Command                              Function

        &N0          Auto-select fastest common protocol.

        &N1          Use V.33 14.4Kbps.

        &N2          Use V.33 12Kbps.

        &N3          Use V.32 9600bps trellis coded.

        &N4          Use V.32 9600bps.

        &N5          Use V.32 4800bps.

        &N6          Use V.29 9600bps.

        &N7          Use V.29 7200bps.

        &N8          Use V.29 4800bps.

        &N9          Use V.27bis 4800bps.

        &N10         Use V.27bis 2400bps

        &N11         Use V.26bis 2400bps.

        &N12         Use V.23 1200/75bps.

        &N13         Use V.23 600/75bps.

        &N14         Use V.22bis 2400/1200bps.

        &N15         Use V.22 1200bps.

        &N16         Use V.21 300bps.

    PROTOCOL/SPEED - SWITCHED/LEASED LINE (CONT)

  Command                   Function

   &N17     Use V.32bis 14.4Kbps.

   &N18     Use V.32bis 12Kbps.

   &N19     Use V.32bis 7200bps.

   &N24     Use Bell 212A 1200bps.

   &N25     Use Bell 103A 300bps.

   &N32     Use FAX mode.

   &N34     Use ZyXEL 19.2Kbps.

   &N35     Use ZyXEL 16.8Kbps.

   &N36     Use ZyXEL 14.4Kbps.

   &N37     Use ZyXEL 12Kbps.

   &N38     Use ZyXEL 9600bps.

   &N39     Use ZyXEL 7200bps.

   &N42     Use ZyCELL 14.4Kbps.

   &N43     Use ZyCELL 12Kbps.

   &N44     Use ZyCELL 9600bps.

   &N45     Use ZyCELL 7200bps.

   &N46     Use ZyCELL 4800bps.

   &N62     Use V.34 28.8Kbps.

   &N63     Use V.34 26.4Kbps.

   &N64     Use V.34 24Kbps.

   &N65     Use V.34 21.6Kbps.

   &N66     Use V.34 19.2Kbps.

   &N67     Use V.34 16.8Kbps.

   &N68     Use V.34 14.4Kbps.

   &N69     Use V.34 12Kbps.

   &N70     Use V.34 9600bps.

   &N71     Use V.34 7200bps.

   &N72     Use V.34 4800bps.

   &N73     Use V.34 2400bps.

                   PROTOCOL/SPEED - SWITCHED/LEASED LINE

  Type:              Configuration

  Format:            AT [cmds] S19=n [cmds]

  Description:       Selects the current protocol and speed for switched
                     and leased-line calls.

      Command                              Function

       S19=0         Auto-select fastest common protocol.

       S19=1         Use V.33 14.4Kbps.

       S19=2         Use V.33 12Kbps.

       S19=3         Use V.32 9600bps trellis coded.

       S19=4         Use V.32 9600bps.

       S19=5         Use V.32 4800bps.

       S19=6         Use V.29 9600bps.

       S19=7         Use V.29 7200bps.

       S19=8         Use V.29 4800bps.

       S19=9         Use V.27bis 4800bps.

       S19=10        Use V.27bis 2400bps

       S19=11        Use V.26bis 2400bps.

       S19=12        Use V.23 1200/75bps.

       S19=13        Use V.23 600/75bps.

       S19=14        Use V.22bis 2400/1200bps.

       S19=15        Use V.22 1200bps.

       S19=16        Use V.21 300bps.

       S19=17        Use V.32bis 14.4Kbps.

       S19=18        Use V.32bis 12Kbps.

       S19=19        Use V.32bis 7200bps.

       S19=24        Use Bell 212A 1200bps.

       S19=25        Use Bell 103A 300bps.

       S19=32        Use FAX mode.

       S19=34        Use ZyXEL 19.2Kbps.

       S19=35        Use ZyXEL 16.8Kbps.

       S19=36        Use ZyXEL 14.4Kbps.

       S19=37        Use ZyXEL 12Kbps.

    PROTOCOL/SPEED - SWITCHED/LEASED LINE (CONT)

  Command                   Function

  S19=38    Use ZyXEL 9600bps.

  S19=39    Use ZyXEL 7200bps.

  S19=42    Use ZyCELL 14.4Kbps.

  S19=43    Use ZyCELL 12Kbps.

  S19=44    Use ZyCELL 9600bps.

  S19=45    Use ZyCELL 7200bps.

  S19=46    Use ZyCELL 4800bps.

  S19=62    Use V.34 28.8Kbps.

  S19=63    Use V.34 26.4Kbps.

  S19=64    Use V.34 24Kbps.

  S19=65    Use V.34 21.6Kbps.

  S19=66    Use V.34 19.2Kbps.

  S19=67    Use V.34 16.8Kbps.

  S19=68    Use V.34 14.4Kbps.

  S19=69    Use V.34 12Kbps.

  S19=70    Use V.34 9600bps.

  S19=71    Use V.34 7200bps.

  S19=72    Use V.34 4800bps.

  S19=73    Use V.34 2400bps.

                         READ PROFILE FROM REMOTE

  Type:               Immediate

  Format:             AT [cmds] *Rmn [cmds]

  Description:        Reads configuration n from the remote modem and
                      stores it in local profile m.

      Profile                               Meaning

         0            Stored profile 0.

         1            Stored profile 1.

         2            Stored profile 2.

         3            Stored profile 3.

         4            Active configuration; may be applied only to
                      remote.

         5            Factory defaults; may be applied only to remote.

                                  REDIAL

  Type:          Immediate

  Format:        AT [cmds] DL

  Description:   Redials the last number dialed.

                            REDIAL CONTINUOUSLY

  Type:           Immediate

  Format:         A>

  Description:    Redials the last number dialed up to 9 times.

  Note:           Do not precede this command with AT or follow it with
                  <CR>.

                       REMOTE CONFIGURATION REQUEST

  Type:             Configuration

  Format:           AT [cmds] *Fn [cmds]

  Description:      Sets the modem to accept or deny requests for remote
                    configuration.

     Command                              Function

       *F0          Deny remote configuration request.

       *F1          Grant remote configuration request. &T4 must also be
                    set.

                               RESULT CODES

  Type:              Configuration

  Format:            AT [cmds] Xn [cmds]

  Description:       Selects which result codes will be displayed.

      Command                             Function

        X0           Basic result codes only enabled.

        X1           Basic and connection speed result codes enabled.

        X2           Basic and connection speed result codes and dialtone
                     detection enabled.

        X3           All result codes except dialtone detection enabled.

        X4           All result codes enabled.

        X5           All result codes plus DTE speed and error control
                     level enabled.

        X6           All result codes plus ARQ enabled.

        X7           All result codes plus ARQ and error control level
                     enabled.

                                RING VOLUME

  Format:         AT [cmds] Nn [cmds]

  Default:        5

  Range:          0 - 7

  Unit:           N/A

  Description:    Sets the volume of the ring sound. N0 disables the ring
                  sound.

                               RTS/CTS DELAY

  Type:                  Register

  Format:                AT [cmds] S26=n [cmds]

  Default:               0

  Range:                 0-255

  Unit:                  10 ms

  Description:           Sets the time in synchronous mode between the
                         RTS signal going high and the CTS signal being
                         set high.

                             SECONDARY CHANNEL

  Type:          Configuration

  Format:        AT [cmds] *Sn [cmds]

  Description:   Selects the secondary channel.

    Command                              Function

      *S0        Secondary channel disabled.

      *S1        Secondary channel enabled.

                          SECURITY CONFIGURATION

  Type:                  Configuration

  Format:                AT [cmds] *Gn [cmds]

  Description:           Sets security mode and options.

        Command                             Function

          *G0            Security disabled.

          *G1            Security type I and password check enabled.

          *G2            Security type I, callback, and password check
                         enabled.

          *G3            Security type II and password check enabled.

          *G4            Security type II, callback, and password check
                         enabled.

          *G5            Security type II, callback, and password check
                         enabled. Callback number sent by remote.

                             SERIAL PORT MODE

  Type:          Configuration

  Format:        AT [cmds] CMn [cmds]

  Description:   Sets the operating mode of the serial interface.

    Command                              Function

      CM0        Single-stream mode.

      CM1        Multistream mode.

                                SOFT RESET

  Type:                Immediate

  Format:              AT [cmds] Zn [cmds]

  Description:         Restores modem profiles previously saved in
                       non-volatile RAM using the &W command.

       Command                              Function

          Z0           Restore profile 0.

          Z1           Restore profile 1.

          Z2           Restore profile 2.

          Z3           Restore profile 3.

          Z4           Restore factory defaults and use them as power-on
                       defaults.

                            STATUS REGISTER BIT

  Type:          Configuration

  Format:        Read: AT [cmds] Sn.m=0 or 1 [cmds]

                 Write: AT [cmds] Sn.m=? [cmds]

  Example:       AT S40.4=1 S51.3?<CR>

  Description:   Sets/clears or reads bit m of register n.

                           STORE ACTIVE PROFILE

  Type:             Immediate

  Format:           AT [cmds] &Wn [cmds]

  Description:      Writes the values for the active profile into the
                    non-volatile RAM.

     Command                              Function

       &W0          Write the active profile to stored profile 0.

       &W1          Write the active profile to stored profile 1.

       &W2          Write the active profile to stored profile 2.

       &W3          Write the active profile to stored profile 3.

                             TELEPHONE STATUS

  Type:              Configuration

  Format:            AT [cmds] +VLH? [cmds]

  Description:       Reports whether the telephone connected to the Line
                     In jack is on-hook.

       Value                               Meaning

      +VLH=0         Telephone is on-hook.

      +VLH=1         Telephone is off-hook.

                                TEST MODES

  Type:          Immediate

  Format:        AT [cmds] &Tn

  Description:   Performs and configures test modes.

    Command                              Function

      &T0        End current test.

      &T1        Begin local analog loopback test.

      &T3        Begin local digital loopback.

      &T4        Grant remote digital loopback request.

      &T5        Deny remote digital loopback request.

      &T6        Request remote digital loopback

      &T7        Request remote digital loopback and self-test.

      &T8        Begin local analog loopback and self-test.

      &T9        Begin ISDN loopback.

      &T10       Begin ISDN loopback and self-test.

                        TONE GENERATOR (PHONE KEYS)

  Type:                  Immediate

  Format:                AT [cmds] +VTS=a

  Example:               AT +VTS=* +VTS=A<CR>

  Range:                 0-9, A-D, #, *

  Description:           Generates the DTMF tone for the characters in
                         the string for the duration set with +VBT.

                     TONE GENERATOR (TIMED PHONE KEYS)

  Type:           Immediate

  Format:         AT [cmds] +VTS={a, n}

  Example:        AT +VTS={*, 10}<CR>

  Range:          a 0-9, A-D, #, *; x 0-255

  Unit:           x .1 second

  Description:    Generates the DTMF tone for duration x for the
                  character a.

                       TONE GENERATOR (DIRECT ENTRY)

  Type:             Immediate

  Format:           AT [cmds] +VTS=[m, n, x]

  Example:          AT +VTS=[2000, 3000, 12]<CR>

  Range:            m 200-3300, n 200-3300, x 0-255

  Unit:             m 1 Hz, n 1 Hz, x .1 second

  Description:      Generates a dual-frequency tone for duration x at
                    frequencies m and n.

                           TONE GENERATOR LENGTH

  Format:                AT [cmds] +VTD=n,m [cmds]

  Default:               n 50, m 70

  Range:                 0 - 255

  Unit:                  10ms

  Description:           Sets the length of DTMF tones that are generated
                         to n and the delay between tones to m.

                          U-1496 COMPATIBLE MODE

  Type:                   Register

  Format:                 AT [cmds] S62=n [cmds]

  Description:            Selects whether the modem will use the settings
                          from the U-1496 model or the normal settings.
                          This affects register S18.

        Command                              Function

         S62=0            U-1496 compatible mode disabled.

         S62=1            U-1496 compatible mode enabled.

                           VOICE AUTO-DISCONNECT

  Type:                Configuration

  Format:              AT [cmds] +VNH=n [cmds]

  Description:         Configures the auto-disconnect mode.

       Command                             Function

       +VNH=0          Auto-disconnect disabled.

       +VNH=1          Auto-disconnect enabled.

       +VNH=2          Auto-disconnect enabled, but ATH disables
                       auto-disconnect and does not hang up.

                             VOICE COMPRESSION

  Type:                Configuration

  Format:              AT [cmds] +VSM=n,m [cmds]

  Description:         Selects the compression type and sample rate to be
                       used for voice data storage.

       Command                             Function

       m=7200          Select 7.2KHz sample rate.

       m=8000          Select 8KHz sample rate.

       m=9600          Select 9.6KHz sample rate.

       m=11025         Select 11KHz sample rate.

         n=1           Select Code Excited Linear Prediction compression.

         n=2           Select 2-bit ZyXEL ADPCM compression.

         n=3           Select 3-bit ZyXEL ADPCM compression.

         n=4           Select 4-bit ZyXEL ADPCM compression.

        n=30           Select 3-bit ZyXEL ADPCM compression with resync.

        n=40           Select 4-bit DVI ADPCM compression.

        n=80           Select 8-bit A-law PCM compression.

        n=81           Select 8-bit Mu-law PCM compression.

                               VOICE CONNECT

  Type:           Result code

  Format:         VCON

  Description:    Returned by the modem when a voice connection has been
                  made.

                               VOICE DEVICE

  Type:          Configuration

  Format:        AT [cmds] +VLS=n [cmds]

  Description:   Selects the I/O device for the DSP chip.

    Command                              Function

     +VLS=0      Voice I/O disabled.

     +VLS=1      Telephone connected to Line In jack.

     +VLS=2      Phone line connected to switched line jack.

     +VLS=8      External microphone.

    +VLS=16      Internal speaker.

                           VOICE DTMF DETECTION

  Type:                  Configuration

  Format:                AT [cmds] +VDD=m,n [cmds]

  Default:               m 15, n 8

  Range:                 m 0-31, n 0-255

  Unit:                  m 1 dB, n .1 second

  Description:           Sets the threshold of DTMF detection (m) and the
                         minimum period of DTMF required to be detected
                         (n).

                           VOICE GAIN - PLAYBACK

  Type:          Configuration

  Format:        AT [cmds] +VGT=n [cmds]

  Default:       128

  Range:         56-200

  Unit:          N/A

  Description:   Sets the gain for voice playback.

                            VOICE GAIN - RECORD

  Type:                Configuration

  Format:              AT [cmds] +VGR=n [cmds]

  Default:             0

  Range:               0, 56-200

  Unit:                N/A

  Description:         Sets the gain for received voice signals. A value
                       of 0 sets automatic gain level.

                          VOICE INACTIVITY TIMER

  Type:                  Configuration

  Format:                AT [cmds] +VIT=n [cmds]

  Default:               70

  Range:                 0-255

  Unit:                  .1 second

  Description:           Sets the length of time that the modem does not
                         receive any voice data before it returns to
                         command mode.

                         VOICE INITIALIZE SETTINGS

  Type:          Immediate

  Format:        AT [cmds] +VIP [cmds]

  Description:   Resets all voice mode settings to factory defaults.

                        VOICE OFF-HOOK SENSITIVITY

  Type:                  Configuration

  Format:                AT [cmds] +VVT=n [cmds]

  Default:               16

  Range:                 0-255

  Unit:                  N/A

  Description:           Sets the sensitivity of detection of the remote
                         site going off-hook. Lower numbers are more
                         sensitive.

                               VOICE RECEIVE

  Type:          Immediate

  Format:        AT [cmds] +VRX

  Description:   Begins receiving voice data.

                         VOICE RE-RING DETECT TIME

  Type:                  Configuration

  Format:                AT [cmds] +VRA=n [cmds]

  Default:               70

  Range:                 0-255

  Unit:                  .1 second

  Description:           Sets the maximum time the modem will wait for
                         the remote station to ring again before it
                         assumes that it has gone off-hook.

                            VOICE RESYNC CLOCK

  Type:           Configuration

  Format:         AT [cmds] +VSY=n [cmds]

  Default:        0

  Range:          0-255

  Unit:           50 ms

  Description:    Sets the time between resync signals in the stored
                  voice data.

                          VOICE RING DETECT TIME

  Type:                  Configuration

  Format:                AT [cmds] +VRN=n [cmds]

  Default:               Unidentified

  Range:                 0-255

  Unit:                  1 second

  Description:           Sets the maximum time the modem will wait for
                         the remote station to ring before it assumes
                         that it went off-hook before it rang.

                          VOICE SILENCE DETECTION

  Type:                  Configuration

  Format:                AT [cmds] +VSD=m,n [cmds]

  Default:               Unidentified

  Range:                 m 0-31, n 0-255

  Unit:                  m 1 dB, n .1 second

  Description:           Sets the threshold of silence detection (m) and
                         the minimum period of silence required to be
                         detected (n).

                              VOICE TRANSMIT

  Type:          Immediate

  Format:        AT [cmds] +VTX

  Description:   Begins transmitting voice data.

                          WRITE PROFILE TO REMOTE

  Type:               Immediate

  Format:             AT [cmds] *Wmn [cmds]

  Description:        Reads configuration n from the local modem and
                      stores it in remote profile m.

      Profile                              Function

         0            Stored profile 0.

         1            Stored profile 1.

         2            Stored profile 2.

         3            Stored profile 3.

         4            Active configuration; may be applied only to local.

         5            Factory defaults; may be applied only to local.

                      Proprietary V.25bis Command Set

                             COMMAND SET - AT

  Type:          Immediate

  Format:        RST

  Description:   Returns to AT command set.

