v90atcom.txt

话带数据中传真解调程序

Version 1.0                                     Lucent Technologies Inc.                                                              5



Host-Based Controller Modem                                                                           Data Addendum
AT Command Set                                                                                            June 15,
1998

AT Commands Reference

AT commands are issued to the modem to control the modem's operation and software configuration.  AT
commands can only be entered while the modem is in command mode.  The format for entering AT commands is:
             TYPE:              ATXn                      where X is the AT command and n is the specific value for that
command.
             PRESS:                      Enter            If n is omitted from a command that takes a parameter valu, the
             value 0 I(zero)
                                                  is assumed.
Any command issued is acknowledged with a response in either text or numeric values known as result codes.
Table 2 lists all the valid result codes.
In the following listing, all commands and command-values accepted by the modem are shown; any entries other
than those shown cause the ERROR result code.

+++  Escape sequence

The escape sequence allows the modem to exit data mode and enter on-line command mode.  While in on-line
command mode, you may communicate directly to your modem using AT commands.  Once you are finished, you
may return to data mode using the ATO command.
A pause, the length which is set by the Escape Guard Time (S12), must be used before and after an escape
sequence is issued. This pause prevents the modem from interpreting the escape sequence as data.
The value of the escape sequence character may be changed using Register S2.
A/                    Repeat Last Command
This command repeats the last command string entered.  Do not precede this command with an AT prefix or
conclude it by pressing Enter.
A                     Answer Command
This command instructs the modem to go off-hook and answer an incoming call.
Bn                    Communication Standard Setting
This command determines CCITT vs. Bell standard.
      B0:             Selects CCITT V.22 mode when the modem is at 1200 bits/s.
      B1:             Selects Bell 212A when the modem is at 1200 bits/s (default).
      B2:             Unselects V23 reverse channel  (same as B3 ).
      B3:             Unselects V23 reverse channel (same as B2 ).
      B15:            Selects V.21 when the modem is at 300 bits/s.
      B16:            Selects Bell 103J when the modem is at 300 bits/s (default).
Result Codes:
             OK                          n = 0, 1, 2, 3, 15, 16
             ERROR                                Otherwise

Cn                    Carrier Control
The modem will accept the C1 command without error in order to assure backward compatibility with
communications software that issues the C1 command.  However, this modem does not support the C0
command.  The C0 command may instruct some other modems not to send carrier (i.e., it puts them in a receive-
only mode).
             C0:                Transmit carrier always off.
             C1:                Normal transmit carrier switching.
Result Codes:
      OK                        n = 1
      ERROR           Otherwise


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Data Addendum                                                                  Host-Based Controller Modem
June 15, 1998                                                                                   AT Command Set
AT Command Reference (continued)


Dn                 Dial
This command instructs the modem to begin the dialing sequence.  The dial string (n, including modifiers and the
telephone number) is entered after the ATD command.



A dial string can be up to 60 characters long.  Any digit or symbol (0 9, *, #, A, B, C, D) may be dialed as touch-
tone digits.  Characters such as spaces, hyphens, and parentheses do not count they are ignored by the
modem and may be included in the dial string to enhance readability.


The following may be used as dial string modifiers:
            L      Redials last number.  Should be the first character following ATD, ignored otherwise.
            P      Pulse dialing.
            T      Touch-tone dialing (default).
            ,      Pause during dialing.  Pause for time specified in Register S8 before processing the next
character
                   in the dial string.
            W      Wait for dial tone.  Modem waits for a second dial tone before processing the dial string.
            V      The modem switches to speakerphone mode and dials the number.  An ATH command may be
used to
                   disconnect the voice call.
            @      Wait for quiet answer.  Wait for five seconds of silence after dialing the number.  If silence is not
                   detected, the modem sends a NO ANSWER result code back to the user.
            !      Hook flash. Causes the modem to go on-hook for 0.5 seconds and then return to off-hook.
            ;      Return to command mode.  Causes the modem to return to command mode after dialing the
number,
                   without disconnecting the call.
            ^      Disable data calling tone transmission.
            S=n Dial a telephone number previously stored using the &Zn=x command (see the &Zn=x command for
                   further information).  The range of n is 0-3.
            $      Bong tone detection

En                 Echo Command
This command controls whether or not the characters entered from your computer keyboard are echoed back to
your monitor while the modem is in command mode.
            E0:             Disables echo to the computer.
            E1:             Enables echo to the computer (default).
Result Codes:
      OK                    n = 0, 1
      ERROR        Otherwise


Fn                 Online Data Character Echo Command
This command determines if the modem will echo data from the DTE.  This modem does not support the F0
version of the command.  However, the modem will accept F1, which may be issued by older communication
software, to assure backward compatibility.
            F0:             Online data character echo enabled (NOT SUPPORTED).
            F1:             Online character echo disabled.
Result Codes:

Version 1.0                                Lucent Technologies Inc.                                                         7



Host-Based Controller Modem                                                                    Data Addendum
AT Command Set                                                                                      June 15, 1998
AT Command Reference (continued)

      OK                    n = 1


      ERROR         Otherwise

Hn                  Hook Control
This command instructs the modem to go on-hook to disconnect a call, or off-hook to make the phone line busy.
            H0:             Modem goes on-hook (default).
            H1:             Modem goes off-hook.
Result Codes:


OK                          n = 0, 1
ERROR               Otherwise



In                  Request ID Information
This command displays specific product information about the modem.
            I0:             Returns modem identity string and driver version number, same as I3.
            I1:             Calculates ROM checksum and displays it on the DTE.
            I2:             Performs a ROM check and calculates and verifies the checksum displaying OK or
ERROR.I3:                   Returns modem identity string and driver version number, same as I0.
            I4:             Returns firmware version for data pump.
            I5:             Returns the board/firmware ID and country ID in hexadecimal (for Apollo).
                            Returns the code ver, board ID, country ID and subsystem vendor ID in hexadecimal (for
MARS).I6-8:                 Returns OK for compatibility.
            I9:             Returns country ID in English.
            I11:            Displays connection information as described in the following example.
Result Codes:
            As described    n = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11
      ERROR                 Otherwise

















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Data Addendum                                                                             Host-Based Controller Modem
June 15, 1998                                                                                        AT Command Set
AT Command Reference (continued)

The ATI11 result has two pages; the user must hit a key to get the second page.  See the following example:
ati11
      Description                                     K56flex connection        V.90 Connection
      ---------------                                 ------------------        ---------------
1     Last Connection                                 56K                       V.90
2     Initial Transmit Carrier Rate                   28800                     28800
3     Initial Receive  Carrier Rate                   50000                     49333
4     Final   Transmit Carrier Rate                   28800                     28800
5     Final   Receive  Carrier Rate                   50000                     49333
6     Protocol Negotiation Result          LAPM                                 LAPM
7     Data Compression Result              V42bis                               V42bis
8     Estimated Noise Level                           152                       152
9     Receive  Signal Power Level  (-dBm) 25                                    25
10    Transmit Signal Power Level (-dBm) 16                                     16
11    Round Trip Delay                 (msec) 4                                 4
Press any key to continue; ESC to quit.

12    Near Echo Level              (-dBm)  NA                                   NA
13    Far  Echo Level                (-dBm) NA                                  NA
14    Transmit Frame Count                 3                                    3
15    Transmit Frame Error Count           0                                    0
16    Receive  Frame Count                 0                                    0
17    Receive  Frame Error Count           0                                    0
18    Retrain by Local  Modem              0                                    0
19    Retrain by Remote Modem             0                                     0
20    Call Termination Cause               0                                    0
21    Robbed-Bit Signaling                            00                        00
22    Digital Loss                            (dB)  6                           6
23    Remote Server ID                                4342C3                    NA

OK
The ATI11 command may be issued from on-line command mode or after the end of a call.  After a call, some of
the values are no longer valid; it's useful to know which ones.
Each of the line items in the ATI11 result is explained next:
1. V.90, 56K, V.34, or V.32 depending on the type of connection negotiated.
2. Initial upstream rate
3. Initial downstream rate
4. Current or final upstream rate
5. Current or final downstream rate
6. LAPM or MNP or None, depending on V.42 negotiation
7. V42bis or MNP or None, depending on V.42 negotiation
8. Mean-square error of received downstream signal.  Difference between received constellation point and
      reference decision point.  This is a dimensionless decimal number, only valid during a call.  Higher numbers
      are worse.  There's no absolute threshold of goodness; it depends on the downstream data rate. The number
      varies during a call, so it can be useful to sample it a few times.
9. The received signal power, although labeled -dBm, is only a relative measure for comparing calls to/from
      different locations.  Only valid during a call.
10. Upstream transmit signal power.
11. Round-trip delay in milliseconds.
12. Echo levels are valid for V.34 only.
13. Echo levels are valid for V.34 only.
14. Number of LAPM frames sent upstream during this call.  Count wraps around at 65535.
15. Number of REJ frames received at the analog client modem.
16. Number of LAPM frames received by client during this call. Count wraps around at 65535.
17. Number of frames received in error by the client.
18. Number of retrains or rate renegotiations requested by this modem.
19. Number of retrains or rate renegotiations requested by remote modem.
Version 1.0                                         Lucent Technologies Inc.                                             9



Host-Based Controller Modem                                                                            Data Addendum
AT Command Set                                                                                              June 15, 1998
AT Command Reference (continued)

20. Reason for call ending, only valid after call ends:
      0 = Local modem command: ATH, DTR drop
      1 = Remote modem: cleardown, loss of signal
      2 = No answer, busy, etc.
      3 = Training failure V.90, K56flex or V.34.
      4 = Protocol failure if required by \N4, for example.
21. For PCM connection only, a hexadecimal 6-bit pattern of T1 frames with robbed-bit signaling.
22. For PCM connection only, the downstream digital loss.
23. For K56flex connection only, the V.8bis info sent by the server.  Meaning is defined at the server and by
      convention.  Example above is from a recent Ascend MAX in