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AT Command Reference Manual
3-58 1048
3.10 SYNCHRONOUS ACCESS MODE
3.10.1 Synchronous Access Mode Commands
Three commands support Synchronous Access Mode:
+ES Enables and disables Synchronous Access Mode in the client or central site modem
+ESA Configures the operation of the Synchronous Access Submode
+ ITF Selects Transmit Flow Control Thresholds
Enabling Synchronous Access Mode enables the use of the 8-bit command characters defined in Table 9/V.80 of the Draft
ITU-T Recommendation V.80 (DATA COMMUNICATION OVER THE TELEPHONE NETWORK; In-Band DCE Control and
Synchronous Data Modes for Asynchronous DTE).
+ES - Enable Synchronous Access Mode
This extended-format command specifies the initial requested mode of operation when the modem is operating as the
originator, optionally specifies the acceptable fallback mode of operation when the modem is operating as the originator, and
optionally specifies the acceptable fallback mode of operation when the modem is operating as the answerer. The command
format is:
+ES=[<orig_rqst>[,<orig_fbk>[,<ans_fbk>]]]
This extended-format compound parameter is used to control the manner of operation of the V.42 protocol in the modem (if
present). It accepts three numeric subparameters:
<orig_rqst>
Specifies the initial requested mode of operation when the modem is operating as the originator.
The options are:
3 Initiate V.42 with Detection Phase. (Default.)
6 Initiate Synchronous Access Mode when connection is completed, and Data State is
entered.
7 Initiate Frame Tunneling Mode when connection is completed, and Data State is entered.
<orig_fbk>
Specifies the acceptable fallback mode of operation when the modem is operating as the
originator. This subparameter should not be commanded.
<ans_fbk> Specifies the acceptable fallback mode of operation when the modem is operating as the
answerer. The options are:
2 Error control optional (either LAPM or Alternative acceptable); if error control not
established, maintain DTE-modem data rate and use local buffering and flow control
during non-error-control operation. (Default.)
8 Initiate Synchronous Access Mode when connection is completed, and Data State is
entered.
9 Initiate Frame Tunneling Mode when connection is completed, and Data State is entered.
Examples:
+ES=6 Enable Synchronous Access Mode originator (client modem only)
+ES=,,8 Enable Synchronous Access Mode answerer (client modem only)
+ES=6,,8 Enable Synchronous Access Mode originator and answerer (client modem only)
+ES=7 Enable Frame Tunneling Mode originator (central site modem only)
+ES=,,9 Enable Frame Tunneling Mode answerer (central site modem only)
+ES=7,,9 Enable Frame Tunneling Mode originator and answerer (central site modem only)
+ES=3 Disable Synchronous Access Mode originator
+ES=,,2 Disable Synchronous Access Mode answerer
+ES=3,,2 Disable Synchronous Access Mode originator and answerer