AT Commands
F-38 AT Commands
NOTE
If both modems are set to auto-reliable mode, a normal connection or no
connection could result due to noise on the telephone line.
LAPM reliable mode (\N4) uses the LAPM reliable link to provide error detection and
automatic retransmission of data if an error occurs. This ensures that communications
between your system and the remote system are error-free. The remote system must
also be equipped to handle a LAPM reliable link. The modem attempts to establish an
LAPM reliable link immediately after making a connection. If the attempt fails, the
modem disconnects.
LAPM reliable mode with fallback to normal mode (\N5) attempts to establish an
LAPM reliable connection. If the LAPM connection attempt fails, the modem falls
back to a normal connection.
LAPM reliable mode with fallback to MNP reliable mode (\N6) attempts to establish
an LAPM reliable connection. If the LAPM connection attempt fails, the modem then
tries to establish an MNP reliable connection.
The following chart indicates the type of connections, depending on the operating
mode. NC indicates No Connection. Where more than one operating mode is in a
column, the first mode is for the originating modem and the second mode is for the
answering modem.
Note for MNP Extended Services:
In the following table, you can use MNP Extended Services for V.42 connections
where LAPM appears if both modems are set with -K1 or -K2
