Multi-Tech Systems MT128ZLX-NT - Manual (Page 245)

MultiMobile MT128ZLX User Guide Appendix D: Using AT Commands
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Command Options Function & Description
AT!Q=n n=0 Set B-channel speed to 64 K
n=4 Set B-channel speed to 56 K
AT!Z=n B-channel protocol selection
n=05 V.120
n=09 Async to Sync PPP conversion
AT&F Load factory default profile to active RAM.
AT&J0 Use two different ISDN phone numbers for making multi-link PPP calls.
AT&J1 Use single ISDN phone number for Multi-Link PPP connections.
AT&K Verifies TA hardware function; entering AT&K invokes hardware is “OK” or “BAD”.
The “!” command modifier is used to change certain fundamental configuration parameters which are
infrequently changed – typically, only once at installation. Using these “!” commands during normal
operation with the telephone line connected to the Terminal Adapter (TA), can cause unpredictable
results. It is best to issue the “!” command when the TA is not connected to the ISDN network to avoid
confusion between the TA and ISDN network. The recommended procedure for using the “!” commands is
as follows:
(1) Disconnect the ISDN phone line from the TA.
(2) Issue the “!” commands to set the correct value for the “!” command related parameters.
(3) Issue the AT&Wn command to store the parameters changed during step (2) in the user
profile.
(4) Reconnect the ISDN phone line.
(5) Reset or reboot the ISDN sub-system with the updated configuration parameters.