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Chapter 2 – AT Commands
Modem Connection Commands
Command: +PCW= n
Values:
Default:
Description:
Command: +PIG= n
Values:
Default:
Description:
Call Waiting Enable
n = 0, 1, or 2
2
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 currrent values.
PCM Upstream Ignore
n = 0 or 1
1
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 values.
Command: +PQC= n Quick Connect Control
Values:
Default:
Description:
n = 0, 1, 2, or 3
3
Controls the V.92 shortened Phase 1 and Phase 2 startup procedures (Quick Connect).
When line conditions are stable, quick connect results in shortened connect times;
however, significant fluctuations in line conditions from call to call can result in longer
connect times, in which case it may be advisable to disable quick connect.
+PQC=0 Enables Short Phase 1 and Short Phase 2 (Quick Connect).
+PQC=1 Enables Short Phase 1.
+PQC=2 Enables Short Phase 2.
+PQC=3 Disables Short Phase 1 and Short Phase 2.
+PQC=? Displays the allowed values.
+PQC? Displays the current values.
Command:
Description:
Values:
Result Codes:
+PSS
Use Short Sequence
This command causes a calling modem to force either a V.92 short or full startup
sequence as defined by the +PQC command on the next and subsequent connections.
Syntax: +PSS=<value>
<value> Decimal number corresponding to the selected sequence.
0 The modems decide whether or not to use the short startup procedures.
The short startup procedures can only be used if enabled by the +PQC
command. Default
1 Reserved.
2 Forces the use of the full startup procedures on the next and subsequent
connections independent of the setting of the +PQC command.
OK 0 - 2 in V.92 Mode (+MS=V.92)
ERROR Otherwise
Report Commands:
+PSS? Reports selected values.
+PSS=? Reports supported range of parameter values.
Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273F)
17
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