Control Microsystems 5901 - Esa=A,B,C,D,E,F,G,H - Configure Synchronous Access Submode

5901 High Speed Dialup Modem Hardware Manual
October 19, 2007
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Examples:
+ES=6 Enable V.80 Synchronous Access Mode originator
+ES=,,8 Enable V.80 Synchronous Access Mode answerer
+ES=6,,8 Enable V.80 Synchronous Access Mode originator and answerer
+ES=3 Enable V.42 with Detection Phase originator. Disable V.80 Synchronous Access
Mode originator.
+ES=,,2 Allow LAPM, MNP, or Normal Mode connection answerer. Disable V.80
Synchronous Access Mode answerer.
+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM, MNP, or Normal Mode
connection answer. Disable Synchronous Access Mode originator and answerer.
Reporting Current or Selected Values
Command: +ES?
Response: +ES: x,y,z
Example: +ES: 3,0,2 For default settings.
+ES: 6,0,8 For V.80 Synchronous Access Mode originator and answerer.
Reporting Supported Range of Parameter Values
Command: +ES=?
Response: +ES: (x range),( y range), (z range)
Example: +ES: (0-4,6,7),(0-4),(0-6,8,9)
10.4.9 +ESA=a,b,c,d,e,f,g,h - 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:
Command: +ESA=[a[,b[,c[,d[,e[,f[,g[,h]]]]]]]]
a 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).
b 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).
c 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.