3Com DIGITAL MODEM User Manual page 49

Table B-2 AT Command Set Summary for the Internal Analog Modem (continued)
Command Function (Example)
X Select the subset of result
messages that will be used by
the modem to inform the PC of
the results of commands
%E Line quality monitor control
%L Return received line signal level
%Q Report line signal quality
&G Generate guard tone
&V Display current configuration
\A Set MNP max block size
\B Transmit break to remote
\G End-to-end, modem-to-modem
flow control
\L MNP mode
(continued)
AT Command Set for Internal Analog Fax Modem
Description
0 — Basic call progress
1 — Basic call progress and connection
rate
2 — Basic call progress and connection
rate
3 — Basic call progress and connection
rate
4 — All call progress and connection rate
0 — Disable
1 — Enable and retrain
2 — Enable and fallback/forward
3 — Enable and auto-retrain but hang up
immediately if line quality becomes
insufficient
Returns a value that indicates the
received line signal level
Reports the line signal quality
0 — Disable (default)
1 — Select 1800 Hz guard tone
0 — 64
1 — 128
2 — 192
3 — 256
Sends break to remote modem with a
length in multiples of 100 ms (n x 100 ms)
in non-error corrected mode only.
n = 1–9
0 — Disable (default)
1 — Enable
0 — Stream (default)
1 — Block
B-5