4.2.3 Service Class 1 Parameters
+FAR - Adaptive Reception Control
If Adaptive Reception is enabled, the modem adaptively detects the selected message carrier
or V.21 control messages. If the expected carrier is detected, the modem operates as specified
in the respective
+
FRM=
<
mod
>
or
+
FRH=
<
mod
>
commands. If V.21 flag preamble is
detected instead, the modem issues a
+
FRH:3 intermediate result code, and then executes an
implied
+
FRH=3 command.
Write Syntax
+
FAR=
<
value
>
Defined Values
<value> Decimal number corresponding to the selected option.
0 Disable Adaptive Reception. (Default.)
1 Enable Adaptive Reception.
Reporting Current or Selected Values
Command:
+
FAR?
Response:
+
FAR:
<
value
>
Example: +FAR: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +FAR=?
Response: +FAR: (<value> range )
Example: +FAR: (0,1)
+FCL - Carrier Loss Timeout
This parameter allows the DTE to select the modem’s loss-of-carrier delay between initial
loss-of-carrier and qualified loss-of-carrier, when the modem will give up and exit a receive
mode. Intermediate (less than FCL timeout) loss-of-carrier should be indicated by insertion of
the SQ-BAD signal quality indicator in the received data stream.
In unframed receive modes, if the modem detects RTC as described in Recommendation T.30
prior to initial loss of the high speed carrier, or if the modem detects V.21 carrier after initial
loss of high speed carrier, then the modem immediately accepts the loss-of-carrier as
qualified, without waiting for the FCL timer to expire.
In HDLC receive modes, if the modem detects HDLC abort prior to initial loss of the high
speed carrier, or if the modem detects V.21 carrier after initial loss of high speed carrier, then
the modem l immediately accepts the loss-of-carrier as qualified, without waiting for the FCL
timer to expire.
Write Syntax
+
FCL=
<
time
>
Defined Values
<value> Decimal number representing the loss-of-carrier delay time in units
of 100 ms. The range is 0 - 255.
Reporting Current or Selected Values
Command: +FCL?
Response: +FCL:
<
time
>
Example: +FCS: 0 For the default setting.
Reporting Supported Range of Parameter Values
Command: +FCL=?
Response: +FCL: (
<
time
>
range)
Example: +FCL: (0-255)
+
FDD - Double Escape Character Replacement
This parameter conditions the use of the _DLE___SUB_ pair to encode consecutive
