Comtrol AT Commands for SmartACFL - Manual (Page 72)

Command Reference Manual
3-52 Conexant 100722A
3.2.8.1 +ESA - Configure Synchronous Access Submode
The operation of the Synchronous Access sub-Mode is configured by the +ESA parameter.
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:
Syntax
+ESA=[<trans_idle>[,<framed_idle>[,<framed_un_ov>[,<hd_auto>[,<crc_type>[,<nrzi_en>[,<syn1>[,<syn2>]]]]]]]]
Defined Values
<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.
<crc_type> Specifies the CRC polynomial used while operating in Framed sub-Mode. The options are:
0 CRC generation and checking disabled (default).
1 In Framed sub-Mode, the 16-bit CRC is generated by the modem in the transmit direction,
and checked by the modem in the receive direction.
<nrzi_en> Specifies if Non Return to Zero Inverted (NRZI) encoding is to be used by the modem for transmit
and receive data. The options are:
0 NZRI encoding and decoding disabled (default and fixed).
<syn1>, <syn2> Specifies the octet value(s) to be used while performing character-oriented framing. <syn1> is to
be commanded to 255 (FFh); <syn2> is not to be commanded.