B-6 APPENDIX B: AT COMMANDS, REGISTERS, AND RESULT CODES
\N Set preferred error-correcting
mode to be negotiated in a
subsequent data connection
0 — Normal speed buffered
1 — Direct
2 — Reliable link
3 — Auto reliable
4 — Force LAPM
5 — Force MNP
-K MNP extended services Enables/disables conversion of a V.42
LAPM connection to an MNP 10
connection.
0 — Disable
1 — Enable
2 — Enable; inhibits MNP extended
services initiation during V.42 LAPM
answer mode detection phase
-Q MNP 10 fallback to 2400 bps
(V.22bis)/1200 (V.22)
Enables or disables fallback from MNP 10
to V.22bis/V.22.
0 — Disable
1 — Enable (default)
*H Link negotiation speed Controls the connection speed for link
negotiations before upshift occurs
between two MNP Class 10 modems.
0 — Highest rate (default)
1 — 1200 bps
2 — 4800 bps
+F All fax commands (AT+fax sub-
command)
All fax commands
Table B-2 AT Command Set Summary for the Internal Analog Modem (continued)
Command Function (Example) Description
