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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
V92, V90, V34
V32B
V32
V22B
V22, V23C, Bell212A
V21, Bell103
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
+PCW=1
+PCW=2
+PCW=?
+PCW?
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
+PIG=1
+PIG=?
+PIG?
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
+PMH=1
+PMH=?
+PMH?
Multi-Tech Systems, Inc. MultiAccess ACS User Guide
Appendix F – Modem AT Commands
Valid max_rate values (bps)
31200, 28800, 26400, 24000, 21600,19200, 16800,
14400, 12000, 9600, 7200, 4800, 2400
19200, 16800, 14400, 12000, 9600, 7200, 4800
14400, 12000, 9600, 7200, 4800
2400
1200
300
Toggles V.24 Circuit 125 and collects Caller ID if enabled by +VCID
Hangs up
Ignores V.92 call waiting
Displays the allowed values
Displays the current value
Disables PCM upstream
Enables PCM upstream
Displays the allowed values
Displays the current value
Enables V.92 modem on hold
Disables V.92 modem on hold
Displays the allowed values
Displays the current value
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