ZyXEL Communications COMET 336, User Manual

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Voice Operation 57
Table 7-3. Shielded DTE Codes
Code Sent to Modem
Meaning
<DLE>p
Pause. Sent during Voice Transmit Mode to force the modem to suspend sending voice
data to the selected output device(s). Any data currently in the voice transmit buffer is
saved until either a resume (<DLE>r), or cancel <DLE><CAN>, is received, in which
case the data is lost. If a <DLE><ETX> is received during the paused state, the modem
processes it normally, and also automatically resumes transmission of the data left in the
buffer (appended with <DLE><ETX>). Any other data received from the DTE while in
this paused state is placed in the transmit buffer according to available space, with flow
control active. (This command is ignored in other voice submodes.)
<DLE>r
Resume. Sent during Voice Transmit Mode to force the modem to resume sending voice
data to the selected output device(s). Any data currently in the voice transmit buffer is
now played. (This command is ignored in other voice modes.) The pause and resume
commands are different than a simple suspension of data; data in the buffer is frozen and
not played when the DTE pauses.
<DLE>E
Purge DCE Buffer. Sent during the transmission or reception of voice/audio data, by
embedding the command in the voice data stream, to purge the corresponding DCE
buffer. (See the <DLE><EOT> code.)
<DLE>u
Increment Playback Volume. Sent during audio mode to increment the playback volume.
The <DLE>u action command allows the application to increase the playback volume of
the headphone and speaker outputs during playback while in the data state. Each
<DLE>u will increment the transmit level by 1 unit. Adjustment by a value greater than
1 may be achieved by transmitting a string of <DLE>u codes. For example, a string
consisting of "<DLE>u <DLE>u <DLE>u <DLE>u <DLE>u" increases the playback
volume by a value of 5 units. The <DLE>u code can be used to adjust the volume within
the range of 128-228. (See <DLE><u> and <DLE><d> in Section 7.3.2.)
<DLE>d
Decrement Playback Volume. Sent during audio mode to decrement the playback
volume. The <DLE>d action command allows the application to decrease the playback
volume of the headphone and speaker outputs during playback while in the data state.
Each <DLE>d will decrement the transmit level by 1 unit. Adjustment by a value greater
than 1 may be achieved by transmitting a string of <DLE>d codes. For example, a string
consisting of "<DLE>d <DLE>d <DLE>d <DLE>d <DLE>d" decreases the playback