User`s manual

AT Command Reference Manual
1048 3-59
Reporting Selected Options
The modem reports the selected options in response to the following command:
+ES?
The response is:
+ES: <orig_rqst>,<orig_fbk>,<ans_fbk>
Example:
+ES?
+ES: 3,0,2 For the defaults.
+ES: 6,0,8 Synchronous Access Mode originator and answerer enabled (client modem only)
+ES: 7,0,9 Frame Tunneling Mode originator and answerer enabled (central site modem only)
Reporting Supported Options
The modem reports the supported options in response to the following command:
+ES=?
The response is:
+ES: (list of supported <orig_rqst> values),(list of supported <orig_fbk> values),(list of supported <ans_fbk> values)
For example:
+ES=?
+ES: (0-7),(0-4),(0-9)
+ESA - Configure Synchronous Access Submode
The operation of the Synchronous Access sub-Mode is configured by the +ESA parameter. The command format is:
+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>[,<nrzi_en>[,<syn1>[,<syn2>]]]]]]]]
This extended-format compound parameter is used to control the manner of operation of the Synchronous Access Mode in
the modem. It accepts six numeric subparameters:
<trans_idle>
Specifies the bit sequence transmitted by the modem when a transmit data buffer underrun
condition occurs, while operating in Transparent sub-Mode. The options are:
0 In Transparent sub-Mode, modem transmits 8-bit SYN sequence on idle. Modem
receiver does not hunt for synchronization sequence (default and fixed).
<framed_idle>
Specifies the bit sequence transmitted by the modem when a transmit data buffer underrun
condition occurs immediately after a flag, while operating in Framed sub-Mode. The options are:
0 In Framed sub-Mode, modem transmits HDLC flags on idle (default and fixed).
<framed_un_ov>
Specifies the actions undertaken by the modem when a transmit data buffer underrun or overrun
condition occurs immediately after a non-flag octet, while operating in Framed sub-Mode.
0 In Framed sub-Mode, modem transmits abort on underrun in middle of frame (default).
1 In Framed sub-Mode, DCE transmits a flag on underrun in middle of frame, and notifies
DTE of underrun or overrun.
<hd_auto>
Specifies whether or not, in V.34 half-duplex operation, additional procedures besides those
specified in § 12/V.34 shall be performed by the modem when switching from primary channel to
secondary channel operation, and vice versa. This subparameter should not be commanded.