Fcl - Carrier Loss Timeout; Fdd - Double Escape Character Replacement - Conexant H08-15355F Reference Manual

4.2.3.2 +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
Reporting Supported Range of Parameter Values
Command: +FCL=?
Response: +FCL: ( time range)
Example: +FCL: (0-255)
4.2.3.3

FDD - Double Escape Character Replacement

This parameter conditions the use of the •DLE•••SUB• pair to encode consecutive 1/0
prevent unbound expansion of data that contains many 1/0 patterns.
Syntax
FDD= value
Defined Values
<value> Decimal number corresponding to the selected option. For modem decode of <DLE><SUB>, the
defined range are:
For modem encoding of <1/0> <1/0>the defined values are:
Reporting Current or Selected Values
Command: +FDD?
Response: +FDD: <value>
Example: +FDD: 0
1118
Command Reference Manual
For the default setting.
0 <DLE> <DLE> or discard (default and only)
1 <DLE> <DLE> (not supported)
0 <DLE> <DLE> <DLE> <DLE> (default and only)
1 <DLE> <SUB> (not supported)
For the default setting.
Conexant
1/0 in data. This may be used to
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