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16–7
Action Commands in Voice Data State
The DTE may initiate actions by inserting a <DLE> shielded code into the data to
the DCE. The form of the action is <DLE><code>, whereby <code> can be one of
the possible character values listed in the following table :
L (0x4C) Loop current polarity reversal. This may indicate a hang-up or
other events depending on the implementation of the central
office.
r (0x72) Ringback.
b (0x62) BUSY. If the DCE continues to detect a BUSY signal, it may report
this event repeatedly. The delay between reports is 4.0 seconds.
d (0x64) DIAL TONE. If the DCE continues to detect a DIAL TONE, the
DCE may report this event repeatedly. The time interval be-
tween reports is 4.0 seconds.
u (0x75) Transmission Buffer Underrun. The DCE will report this code if
the DCE's buffer becomes empty without first receiving a
<DLE><ETX> or a <DLE><CAN> command.
a (0x61) Data answer tone. The delay between reports is 4.0 seconds.
<code>
Action Command Description
<NUL> (0x0) Does nothing. The DTE can use the code to refresh the DTE/
DCE Inactivity Timer, instead of XON.
<DLE> (0x10) Two contiguous <DLE><DLE> codes indicate that a single
<DLE> is in the data stream.
<SUB> (0x1A) <DLE><DLE> is in the data stream.
u (0x75) Pumps up the volume or gain by one unit.
d (0x64) Pumps down the volume or gain by one unit.
p (0x70) Pauses Transmission Data State: The DCE suspends sending an-
alog data to the currently selected analog destination. While
pausing, the DCE will maintain the contents of its internal trans-
mission buffer and the state of its compressors, continue in the
Data State, and send silence to the analog destination.
r (0x72) Resumes Transmission Data State: The DCE resumes sending
the contents of the DCE buffer to the currently selected analog
destination. Before resuming sending the analog signal to the
analog destination, the DCE will not reset the contents of its
internal transmission buffer, nor reset the compressors.
<code>
Event Report Description