INSYS 56k small INT 2.0 Operating Manual page 37

INSYS Modem 56k small INT 2.0/USB 1.0
5.10.2 Going off-hook on account of a telephone con-
nected in series
If a telephone connected in series goes off-hook during an
existing modem connection, the modem will immediately
terminate the connection.
The telephone is connected to the line and receives a dialing
tone.
In the registry S86, the value is set to 25.
When the phone connection is terminated, the modem will
not establish a new connection.
Changing the loop voltage to detect the function – Off-hook
on account of a telephone connected in series (U2) – can be
set with the help of AT commands.
Voltage
Loop voltage prior
to the connection.
Loop voltage af-
ter a telephone
connected in se-
ries goes off-
hook.
Note:
June 06
The detection starts immediately after the
handset is picked up. To access the exchange,
simple analogue phone systems often connect
the modem per contact directly with the ex-
change, which results in a strong change or po-
larity reversal of the loop voltage. For some
analogue phone systems, this may result in an
erroneous detection. Off-hook detection is
therefore not recommended in connection with
analogue phone systems.
ATS86=25
AT-TTE=U1, U2, U3
U2
Time
Functions
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