ZyXEL Communications Omni TA128 - Manual (Page 99)

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function in B1 channel.
AT&I3 leased line function in both B1 and B2 channels.
If the leased line mode configuration has been saved as the power-
on user's profile and upon power up, the TA128 will ALWAYS try
to make a connection with the remote site using the pre-selected
protocol, B-channel ( B1 or B2 ), and originate/answer mode. To
change the TA128 from leased line mode back to dial-up mode,
reset the modem to the factory default settings.
For some protocols that are originate/answer mode sensitive, use
the following command to configure the originate/answer mode:
AT*Mn leased line auto-handshake mode selection S14b0.
AT*M0 leased line auto-handshake for Originate mode.
AT*M1 leased line auto-handshake for Answer mode.
If the leased line mode is selected after power up, the following
commands can be used to make a leased line connection:
ATDB1 use B1 channel in Originate mode.
ATDB2 use B2 channel in Originate mode.
ATDB3 use both B1 and B2 channels in Originate mode.
ATAB1 use B1 channel in Answer mode.
ATAB2 use B2 channel in Answer mode.
ATAB3 use both B1 and B2 channels in Answer mode.