Priority Circuit For A Phone Connected In Series To The Insys Modem 56K Small Int - INSYS 56k Small INT 2.0 Manual Manual

Functions
12.15 Priority Circuit for a Phone Connected in Series to the IN-
SYS Modem 56k Small INT 2.0
The INSYS Modem 56k Small INT 2.0 may give a phone connected in series priority, to
make sure the modem functions interfere as little as possible with the usage of the
phone connection. TheINSYS Modem 56k Small INT 2.0 can determine on the basis of the
voltage in the line, if the phone line is used by a phone, if a phone in series is going off-
hook or if the remote terminal of the INSYS Modem 56k Small INT 2.0 is terminating the
connection.
The functions of the priority circuit may be combined or used individually. The functions
can be selected and activated with the AT command AT-STE=<n>.
The following table provides the combination of functions with the according AT-STE
command.
Command
AT-STE=0
AT-STE=1
AT-STE=2
AT-STE=3
AT-STE=4
AT-STE=5
AT-STE=6
AT-STE=7
Table 8: Possible combinations of the individual functions of the priority circuit
The modem detects the status of the phone line at the voltage levels in the line. Option-
ally, the voltages for the various line states can be set with the command AT-
TTE=U1,U2,U3. The voltages U1, U2 and U3 are by default set to functioning values and
need not be modified. The following illustration shows the voltage curve for the accord-
ing line state and the appropriate AT command parameters.
44
Detecting a Going off-
busy phone hook by tele-
line phone
Off Off
On Off
Off On
On On
Off Off
On Off
Off On
On On
INSYS Modem 56k Small INT 2.0
Remote terminal
connection abort
Off
Off
Off
Off
On
On
On
On