
XIRCOM, INC.

PS-CEM-28B2/PS-CEM-28BC/PS-CEM-28BT

Card Type                    Fax, Modem (synchronous/asynchronous),
                             Network Interface Card
Chip Set                     Unidentified
Cache                        64KB
Network Transfer Rate        10Mbps
Maximum Modem Rate           28.8Kbps
Maximum Fax Rate             14.4Kbps
Data Bus                     PCMCIA Type II
Fax Class                    Class I & II
Data Modulation Protocol     AT&T V.32terbo

                             Bell 103A/212A

                             ITU-T V.22, V.22bis, V.23, V.32, V.32bis,
                             V.34
Fax Modulation Protocol      ITU-T V.17, V.27ter, V.29
Error Correction/Compression MNP5, V.42bis
Topology                     Linear Bus, Star
Wiring Type                  Unshielded twisted pair(PS-CEM-28BC,
                             PS-CEM-28BT)

                             RG-58A/U 50ohm coaxial(PS-CEM-28B2,
                             PS-CEM-28BC)
Boot ROM                     Not available

                                                                V1804/N1435

                         Proprietary AT Command Set

                     AUTO-RELIABLE FALLBACK CHARACTER

  Type:                  Configuration

  Format:                AT [cmds] %An [cmds]

  Default:               13

  Range:                 0-127

  Unit:                  ASCII

  Description:           Sets the character used as the auto-reliable
                         fallback character. %A0 will disable this
                         function.

                               AUTO FALLBACK

  Type:          Configuration

  Format:        AT [cmds] %Gn [cmds]

  Description:   Selects auto fallback

    Command                              Function

      %G0        Fallback disabled

      %G1        Fallback enabled

                         AUTO-RELIABLE TIME BUFFER

  Type:                 Configuration

  Format:               AT [cmds] \Cn [cmds]

  Description:          Controls the handling of incoming data during
                        auto-reliable time period

       Command                              Function

         \CO            Data is discarded

         \C1            Data is buffered for 4 seconds or 200 characters

         \C2            Data is discarded, sets to normal mode and
                        switches to normal mode when &An received

                               AUTO-RETRAIN

  Type:          Configuration

  Format:        AT %En

  Description:   Selects auto-retrain mode

    Command                              Function

      %E0        Auto-retrain disabled

      %E1        Auto-retrain enabled

                                 BLACKLIST

  Type:              Read only

  Format:            AT [cmds] S140? [cmds]

  Description:       Contains the maximum number of call attempts before
                     number is blacklisted

                                BREAK SEND

  Type:          Configuration

  Format:        AT [cmds] \Bn [cmds]

  Default:       3

  Range:         1-9

  Unit:          .1 second

  Description:   Sends break to modem

                                BREAK TYPE

  Type:             Configuration

  Format:           AT [cmds] \Kn [cmds]

  Description:      Configures action of break signal

      Command        Break from DTE     Modem receives    Break received
                                             \B             from remote
                                                              modem

        \K0         Online command     Break sent to     Buffers cleared,
                    mode enabled,      remote modem      break sent to
                    send no break      and buffers       DTE
                    to remote modem    cleared

        \K1         Break sent to      Break sent to     Buffers cleared,
                    remote modem       remote modem      break sent to
                    and buffers        and buffers       DTE
                    cleared            cleared

        \K2         Online command     Send break to     Break sent
                    mode enabled,      remote modem      immediately to
                    send no break      immediately       DTE
                    to remote modem

        \K3         Send break to      Send break to     Break sent
                    remote modem       remote modem      immediately to
                    immediately        immediately       DTE

        \K4         Online command     Send break with   Break sent with
                    mode enabled,      transmitted       received data to
                    send no break      data              the DTE
                    to remote modem

        \K5         Send break with    Send break with   Break sent with
                    transmitted        transmitted       received data to
                    data               data              the DTE

                               CALLING TONE

  Type:             Configuration

  Format:           AT [cmds] -Cn [cmds]

  Description:      Controls whether the DTE will allow the modem to send
                    a calling tone

     Command                              Function

       -C0          Disable calling tone

       -C1          Enable calling tone

                                COMPRESSION

  Type:          Configuration

  Format:        AT %Cn

  Description:   Selects MNP 5 data compression

    Command                              Function

      %C0        Data compression disabled

      %C1        Data compression enabled

                               CONNECT MODE

  Type:          Configuration

  Format:        AT [cmds] \Nn [cmds]

  Description:   Sets connect mode

    Command                              Function

      \N0        Normal mode enabled

      \N2        Auto-reliable MNP mode enabled

      \N3        Auto-reliable V.42 mode enabled

      \N4        Reliable mode enabled

                            CONVERT TO MNP MODE

  Type:          Configuration

  Format:        AT [cmds] \Z [cmds]

  Description:   Switches to normal mode from MNP mode

                         CONVERT TO RELIABLE MODE

  Type:          Configuration

  Format:        AT [cmds] \Y [cmds]

  Description:   Initiates reliable MNP5 mode link

                               COUNTRY CODES

  Type:          Configuration

  Format:        AT [cmds] S133=n [cmds]

  Description:   Selects country specific operating configuration

    Command                              Function

     S133=0       USA

     S133=1       United Kingdom

     S133=2       Germany

     S133=3       France

     S133=4       Belgium

     S133=5       The Netherlands

                COUNTRY CODES (CONTINUED)

   S133=6    Italy

   S133=7    Spain

   S133=8    Austria

   S133=9    Switzerland

  S133=10    Portugal

  S133=11    Sweden

  S133=12    Norway

  S133=13    Denmark

  S133=14    Finland

  S133=15    Cyprus

  S133=16    Czechoslovakia

  S133=17    Greece

  S133=18    Hungary

  S133=19    Poland

  S133=20    Russia

  S133=21         Turkey

  S133=22         Luxembourg

  S133=23         Iceland

  S133=25         Egypt

  S133=26         India

  S133=27         Kenya

  S133=28         South Africa

  S133=29         Morocco

  S133=48         Abu Dhabi

  S133=49         Australia

  S133=50         Bangladesh

  S133=51         China

  S133=52         Hong Kong

  S133=53         Indonesia

  S133=54         Japan

  S133=55         Korea

  S133=56         Malaysia

  S133=57         New Zealand

  S133=58         Philippines

  S133=59         Singapore

  S133=96         Argentina

  S133=97         Bolivia

  S133=98         Brazil

  S133=99         Chile

  S133=100        Columbia

  S133=101        Costa Rica

  S133=102        Guatemala

  S133=103        Mexico

  S133=104        Nicaragua

  S133=105        Paraguay

  S133=106        Peru

  S133=107        Uruguay

                COUNTRY CODES (CONTINUED)

  S133=108        Venezuela

  S133=128        Kuwait

  S133=129        Oman

  S133=130        Saudi Arabia

                           CREDIT CARD BONG TONE

  Type:          Configuration

  Format:        AT [cmds] S121=n [cmds]

  Description:   Selects credit card bong tone

    Command                              Function

     S121=0       AT&T

     S121=1       MCI

                           DISPLAY CONNECT SPEED

  Type:          Read only

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

  Description:   Displays current DCE speed

    Command                              Function

     S37=5        1200bps

     S37=6        2400bps

     S37=7        4800bps

     S37=8        7200bps

     S37=9        9600bps

     S37=10       12.0Kbps

     S37=11       14.4Kbps

     S37=12       19.2Kbps

     S37=15       28.8Kbps

     S37=26       16.8Kbps

     S37=29       24.0Kbps

     S37=33       21.6Kbps

     S37=34       26.4Kbps

                           ERRONEOUS CALL RETRY

  Type:          Read only

  Format:        AT [cmds] S145? [cmds]

  Description:   Contains value for erroneous call retry

                           ERRONEOUS CALL DELAY

  Type:          Read only

  Format:        AT [cmds] S146? [cmds]

  Description:   Contains value for erroneous call delay

                                FAST RETRY

  Type:          Read only

  Format:        AT [cmds] S141? [cmds]

  Description:   Enable/disable status for fast retry for trouble calls

                            FEATURE NEGOTIATION

  Type:          Configuration

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

  Description:   Controls feature negotiation with remote modem

    Command                              Function

     S48=0        No negotiation

     S48=7        Feature negotiation enabled

    S48=128       Feature negotiation disabled

                               FLOW CONTROL

  Type:          Configuration

  Format:        AT [cmds] \Gn [cmds]

  Description:   Selects modem port flow control

    Command                              Function

      \G0        Flow control disabled

      \G1        Flow control enabled

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] \Qn [cmds]

  Description:   Sets type of flow control used by modem

    Command                              Function

      \Q0        Flow control disabled

      \Q1        XON/XOFF flow control enabled

      \Q2        Unidirectional hardware flow control enabled

      \Q3        Bidirectional hardware flow control enabled

                             FLOW CONTROL TYPE

  Type:          Configuration

  Format:        AT [cmds] &Kn [cmds]

  Description:   Sets type of flow control used by modem

    Command                              Function

      &K0        Local flow control disabled

      &K1        Not used

      &K2        Not used

      &K3        CTS/RTS flow control enabled

      &K4        XON/XOFF flow control enabled

                            HELP SCREEN BORDER

  Type:           Configuration

  Format:         AT [cmds] S120=n [cmds]

  Description:    Selects help screen display option

     Command                             Function

     S120=0       Surround help screen text with ASCII character border

     S120=1       Do not surround help screen text with ASCII character
                  border

                             INACTIVITY TIMER

  Type:                  Register

  Format:                AT [cmds] \Tn [cmds]

  Default:               0

  Range:                 0-90

  Unit:                  1 minute

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

                          INEFFECTIVE CALL DELAY

  Type:          Read only

  Format:        AT [cmds] S144? [cmds]

  Description:   Contains value for ineffective call delay

                          INEFFECTIVE CALL RETRY

  Type:          Read only

  Format:        AT [cmds] S143? [cmds]

  Description:   Contains value for ineffective call fast retry

                        INITIATE MNP RELIABLE MODE

  Type:          Immediate

  Format:        AT [cmds] \O [cmds]

  Description:   Initiates MNP reliable mode from normal or direct mode

                            INTERNATIONAL USAGE

  Type:          Configuration

  Format:        AT [cmds] %TEn [cmds]

  Description:   Controls country specific settings

    Command                              Function

     %TE=0        International usage disabled

     %TE=1        S register 133 enabled

                    MAXIMUM BLOCK SIZE FOR TRANSMISSION

  Type:          Configuration

  Format:        AT [cmds] \An [cmds]

  Description:   Sets the maximum transmittable block size

    Command                              Function

      \A0        MNP block size is 64 characters

      \A1        MNP block size is 128 characters

      \A2        MNP block size is 192 characters

      \A3        MNP block size is 256 characters

                             PSEUDO DTE SPEED

  Type:              Configuration

  Format:            AT [cmds] S122=n [cmds]

  Description:       Sets DTE speed used by CONNECT message. Has not
                     effect on modem operation

      Command                              Function

       S122=0        CONNECT

       S122=1        CONNECT 1200

       S122=2        CONNECT 2400

       S122=3        CONNECT 4800

       S122=4        CONNECT 7200

       S122=5        CONNECT 9600

       S122=6        CONNECT 12000

       S122=7        CONNECT 14400

       S122=8        CONNECT 16800

       S122=9        CONNECT19200

      S122=10        CONNECT 21600

      S122=11        CONNECT 24000

      S122=12        CONNECT 26400

      S122=13        CONNECT 28800

      S122=14        CONNECT 38400

      S122=15        CONNECT 57600

      S122=16        CONNECT 115200

      S122=17        CONNECT 230400

                               RESULT CODES

  Type:          Configuration

  Format:        AT [cmds] \Vn [cmds]

  Description:   Adds /ARQ to connect message

    Command                              Function

      \V0        Add /ARQ to connect message enabled

      \V1        Add /ARQ to connect message disabled

                            TROUBLE CALL DELAY

  Type:          Read only

  Format:        AT [cmds] S142? [cmds]

  Description:   Contains value of trouble call delay

                             V.32 AUTO-RETRAIN

  Type:                 Configuration

  Format:               AT [cmds] &Bn [cmds]

  Description:          Selects action the modem will take during bad
                        line quality on V.32/32bis connection

       Command                              Function

         %B0            Auto-retrain disabled, hang up on poor line
                        quality

         %B1            Auto-retrain on line quality problem enabled

         %B2            Modem ignores line quality problems

                           V.42 DETECTION PHASE

  Type:          Configuration

  Format:        AT [cmds] -Jn [cmds]

  Description:   Controls V.42 detection

    Command                              Function

      -J0        V.42 detection disabled

      -J1        V.42 detection enabled

                        V.42bis COMPRESSION CONTROL

  Type:          Configuration

  Format:        AT [cmds] "Hn [cmds]

  Description:   Controls V.42bis data compression

    Command                              Function

      "H0        V.42bis disabled

      "H1        V.42bis when transmitting enabled

      "H2        V.42bis when receiving enabled

      "H3        V.42bis when transmitting/receiving enabled

                         V.42bis DICTIONARY SIZE

  Type          Configuration

  Format        AT [cmds] "Nn [cmds]

  Default       Unidentified

  Range         512-2048

  Unit          1 byte

  Description   Controls the size of the V.42bis

                       V.42bis MAXIMUM STRING LENGTH

  Type:          Configuration

  Format:        AT [cmds] "On [cmds]

  Default:       32

  Range:         6 - 250

  Unit:          ASCII

  Description:   Selects string size for V.42bis compression.

                             WAIT FOR MNP LINK

  Type:          Configuration

  Format:        AT [cmds] \U [cmds]

  Description:   Modem waits in on line mode for an MNP link

                           XON/XOFF PASS-THROUGH

  Type:          Configuration

  Format:        AT [cmds] \Xn [cmds]

  Description:   Selects whether XON/XOFF signals are sent to remote
                 modem

    Command                              Function

      \X0        XON/XOFF signals trapped by local modem

      \X1        XON/XOFF passed through local modem

