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AT Commands for CX81801/CX06833/CX81300/CX06827 Modems Reference Manual

Conexant 102184B

4-14

+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)

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Comtrol AT Commands Manuale Utente Pagina 168