Diamond SupraExpress 56e Manual page 69

The ans_fbk parameter specifies the acceptable fallback mode. The ans_fbk parameters are:
ans_fbk
0 Direct mode.
1 EC disabled; buffered mode.
3 EC optional; if no EC use Direct mode.
4 Error control required; if no EC disconnect.
5 Error control optional (only LAPM acceptable); if error control
is not established, disconnect.
6 MNP error control required; if no MNP, disconnect.
7 Synchronous mode.
8 V.80 Synchronous access mode. NOTE: For V.80 connections,
the normal setting is +ES=6, 0, 8.
+ESA Synchronous Access Mode Configuration
+ESA? Returns Current Setting
+ESA=?Returns Command Range(s)
The format for AT+ESA = <trans_idle>, <framed_idle>, <framed_un_ov>,
<hd_auto>, <crc_type>, <nrzi_en>, <syn1>, <syn2>
The trans_idle parameter specifies the bit sequence transmitted by the DCE when a transmit
data buffer underrun condition occurs while operating in Transparent sub-Mode.
The trans_idle parameters are:
trans_idle
0 In Transparent sub-Mode, the DCE transmits SYN1 on idle. DCE
receiver does not seek synchronization sequence (default).
1 In Transparent sub-Mode, the DCE transmits SYN1 on idle. DCE
receiver seek SYN1 as a synchronization sequence.
The framed_idle parameter specifies the bit sequence transmitted by the DCE when a
transmit data buffer underrun condition occurs immediately after a flag. This is while
operating in Framed sub-Mode.
The framed_idle parameters are:
framed_idle
0 In Framed sub-Mode, the DCE transmits HDLC flags on idle.
1 In Framed sub-Mode, the DCE transmits marks (one bits) on idle.
69