Appendix F – Modem AT Commands
Multi-Tech Systems, Inc. MultiAccess ACS User Guide
61
max_rate
An optional number that specifies the highest rate at which the modem may
establish an upstream (transmit) connection. The value is decimal coded in units of
bps, for example, 33600 specifies the highest rate to be 33600 bps.
0 Maximum rate determined by the modulation selected in mod (default).
300–33600
Maximum rate value limited by the modulation selected in mod. For valid max_rate
values for each mod value, see the following table.
mod
value
Valid
max_rate
values (bps)
V92, V90, V34
31200, 28800, 26400, 24000, 21600,19200, 16800,
14400, 12000, 9600, 7200, 4800, 2400
V32B
19200, 16800, 14400, 12000, 9600, 7200, 4800
V32
14400, 12000, 9600, 7200, 4800
V22B 2400
V22, V23C, Bell212A
1200
V21, Bell103
300
max_rx_rate
An optional number that specifies the highest rate at which the modem may
establish a downstream (receive) connection. The value is decimal coded in units
of bps, e.g., 28800 specifies the highest rate to be 28800 bps.
0 Maximum rate determined by the modulation selected in
mod
(default).
300–56000 Maximum rate value limited by the modulation selected in
mod
. See “Possible rates” in the
mod
table.
Command: +PCW=n
Call
Waiting
Enable
Values:
n = 0, 1, or 2
Default:
2
Description:
Controls the action to be taken upon detection of a call waiting tone in V.92 mode.
Values specified by this command are not modified when an
AT&F
command is
issued.
+PCW=0
Toggles V.24 Circuit 125 and collects Caller ID if enabled by +VCID
+PCW=1
Hangs
up
+PCW=2
Ignores V.92 call waiting
+PCW=?
Displays the allowed values
+PCW?
Displays the current value
Command:
+PIG=n
PCM Upstream Ignore
Values:
n = 0 or 1
Default:
1
Description:
Controls the use of PCM upstream during V.92 operation. PCM upstream allows
faster upload speeds to a V.92 server.
+PIG=0
Disables
PCM
upstream
+PIG=1
Enables PCM upstream
+PIG=?
Displays the allowed values
+PIG?
Displays the current value
Command:
+PMH=n
Modem on Hold Enable
Values:
n = 0 or 1
Default:
1
Description:
Controls if modem on hold procedures are enabled during V.92 operation. Normally
controlled by a modem on hold program. Values specified by this command are not
modified when an
AT&F
command is issued.
+PMH=0
Enables V.92 modem on hold
+PMH=1
Disables V.92 modem on hold
+PMH=?
Displays the allowed values
+PMH?
Displays the current value