ZyXEL Omni TA 128 User Guide - Page 59

V.25bis Command Set

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ATB19 56000bps There are two modes of synchronous operation: 1. Asynchronous commands, synchronous data (AT&M1): The TA128 accepts AT commands in asynchronous mode. Once the call is connected, it enters synchronous mode for data transmission. 2. Synchronous mode (AT&M3*I1): The TA128 accepts synchronous commands from V.25 bis or a PC with an add-on synchronous card, and exchanges data synchronously with a remote TA. O Note: The TA128 does not support network independent clock compensation. The synchronous timing source must be supplied by the TA128 , which is phase locked to the network synchronous clock. When in V.25bis command mode, the TA128 supports the bitoriented HDLC (High-Level Link Control) synchronous protocol which most synchronous communication links use. Use AT*Ii to enable V.25bis commands. For synchronous applications the TA is set for use with one application, in normal situations. Save the desired settings in the power-on profile and the TA will start up in synchronous mode with V.25bis enabled. A special command set RST is provided to get the TA back to asynchronous AT command mode from V.25bis mode. When the TA is used as a DCE device with a router or main-frame system, use the following command string for best results: AT&S1&M3*I1&W0Z0 V.25bis Command Set Command Messages CRN

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47
ATB19
56000bps
There are two modes of synchronous operation:
1.
Asynchronous commands, synchronous data (AT&M1):
The TA128
accepts AT commands in asynchronous mode.
Once the call is connected, it enters synchronous mode for data
transmission.
2.
Synchronous mode (AT&M3*I1):
The TA128
accepts
synchronous commands from V.25 bis or a PC with an add-on
synchronous card, and exchanges data synchronously with a
remote TA.
O
Note:
The TA128
does not support network independent clock
compensation. The synchronous timing source must be supplied
by the TA128 , which is phase locked to the network
synchronous clock.
When in V.25bis command mode, the TA128 supports the bit-
oriented HDLC (High-Level Link Control) synchronous protocol
which most synchronous communication links use. Use AT*Ii to
enable V.25bis commands. For synchronous applications the TA is
set for use with one application, in normal situations. Save the
desired settings in the power-on profile and the TA will start up in
synchronous mode with V.25bis enabled. A special command set
RST is provided to get the TA back to asynchronous AT command
mode from V.25bis mode.
When the TA is used as a DCE device with a router or main-frame
system, use the following command string for best results:
AT&S1&M3*I1&W0Z0
V.25bis Command Set
Command Messages
CRN <dial string
Dial command with number provided.