User Manual
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Chapter 4—AT Commands, S-Registers, Result Codes
+DS44=? Reports supported options in the format (list of supported direction values), (0),
(0), (list of supported max_codewords_tx values), (list of supported
max_codewords_rx values), (list of supported max_string_tx values), (list of sup-
ported max_string_rx values), (list of supported max_history_tx values), (list of
supported max_history_rx values). Example: +DS44: (3, 0), (0), (0), (256-2048), (256-
2048), (31-255), (31-255), (512-11008), (512-11008).
+DS44? Reports current options in the following format:
direction, 0, 0, max_codewords_tx, max_codewords_rx, max_string_tx, max_string_rx,
max_history_tx, max_history_rx.
Example: +DS44: 3, 0, 0, 1024, 1024, 255, 255, 5120, 4096.
Subparameters
direction Specifies the DTE direction of the data compression.
0 No compression.
3 Compression in both directions (default).
max_codewords_tx Specifies the maximum number of code words to be negotiated in the
transmit direction.
1024 Default.
256–2048 Maximum number of code words in transmit direction.
max_codewords_rx Specifies the maximum number of code words to be negotiated in the
receive direction.
1024 Default.
256–2048 Maximum number of code words in receive direction.
max_string_tx Specifies the maximum string length to be negotiated in the transmit
direction.
255 Default.
31–255 Maximum string length in transmit direction.
max_string_rx Specifies the maximum string length to be negotiated in the receive
direction.
255 Default.
31–255 Maximum string length in receivedirection.
max_history_tx Specifies the maximum length of the history buffer to be negotiated in
the transmit direction.
5120 Default.
512–11008 History buffer size in transmit direction.
max_history_rx Specifies the maximum length of the history buffer to be negotiated in
the receive direction.
4096 Default.
512–11008 History buffer size in receive direction.
Command: +ES=nEnable Synchronous Buffered Mode
Values: n = 6
Default: None
Description: Allows an H.324 video application direct access to the synchronous data channel. On
underflow, the modem sends HDLC flag idle (0x7E) to the remote modem.·This spe-
cial error control mode is overridden by any of the following commands: &F, &M,
&Q, or \N.
+ES=6 Enables direct access to the synchronous data channel.