F
RLSD is ON in idle and tracks carrier in online states, without S9 delay.
This behavior pattern is associated only with {&C2, &Q5, S10=255,
half duplex}, and it only occurs at 4800 and 9600 bits/s in Hayes proprietary
V.32 HDX (half duplex) mode (Express 96). The RLSD circuit is normally ON
in the idle state, and it is ON while the remote carrier is present in the
online State. It goes OFF approximately 3 seconds after loss of remote carrier.
If the remote carrier is restored, then RLSD will go ON again (regardless
of S9). If the Hangup Process is initiated by the DTE using DTR or issuing
ATH from the online command state, then RLSD will return ON just prior to
the modem issuing the "OK"result code.
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Carrier Detect Option page.
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