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42,
Advanced features
12.10
Extended bypass
Command to set:
+&B1
Register used:
+5851
On recognising an incoming call, the circuit 125 remains OFF and the
RING message to the DTE is suppressed, for a defined number
"n"
in +$51 (1 <= n <= 5). During this period the modem will ignore the
auto answer option.
The modem will operate in one of the following ways, as according to
the action taken by the operator.
12.10.1
No action or absent operator:
The normal operation of the modem is retained if no action is
taken by the operator before exceeding +S51
ring bursts. The
modem will begin to send RING message and change the state
of circuit 125 on ring bursts.
The modem will start with the handshake on pressed down
AUTO switch, enabled auto answer option or by A command.
12.10.2
ANSW switch pressed down after +S51 rings:
If the ANSW switch is pressed after +S51 ring bursts, the
modem will immediately start with the handshake.
12.10.3,
ANSW switch pressed down while attending the
phone before +S51 rings:
On attending the phone and hearing the modem or facsimile call
tone, the operator must press the ANSW switch to hand over the
control to the modem.
The modem will then start to simulate an incoming call, i.e. send
ring back signals to the line and RING message to the DTE. The
circuit 125 is also toggled on each RING message. The
modem
will start with the handshake (modem or fax) on A command
from the DTE, on enabled auto answer option or ANSW
switch
pressed again .
The modem will remain in this state for a time period of 30
seconds on missing A command or disabled auto answer option.
To use this function together with Trio DataFax, simply add
+&B1+S51=n in the initializing string during modem set-up. The
modem will ignore n ring bursts, i.e. no RING message will be
sent to DataFax. This will give the opportunity to attend a call
and take an appropriate action such as pressing ANSW switch
to receive a facsimile document.
For Zat 14.4/14.4-7 modem, the DATA/VOICE switch is
used to simulate rings when extended bypass is enabled.
LZTR104006 R1.00
1 2-1 7
Zat 14.4/14.4-7 and 19.2/19.2-7
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