Matrix
46
SIMADO GFX11 System Manual
Disconnect Signaling on FXS Port
What’s this?
• As a general application, telecom equipment like PCO machine
is connected to the FXS port of the gateway. It is required to
inform the FXS port whenever the called party (remote party)
disconnects or goes on-hook so that the PCO machine can
consider the call as complete and stop billing. In absence of this
signal, the call is considered as complete when the caller goes
ON-Hook. This will result in inaccurate billing.
• To avoid such problems, disconnect signal is generated on the
FXS port, if called party disconnects or goes ON-Hook
(disconnects). This is called ‘Disconnect Signaling on FXS port’.
How it works?
• This parameter is applicable only for FXS port for both incoming
and outgoing calls.
• If other port or called party gets disconnected, the system will
check the Disconnect Signal programmed for the FXS port. For
example, Mobile port gets disconnected if ‘DISCONNECT’
message is detected.
• This parameter can be set for either one of the following options:
• None: It can be used when no signaling is to be generated on
the FXS port. No disconnect signal will be generated on the
FXS port.
• Polarity Reversal: It can be used when call disconnection is to
be signaled in the form of Polarity Reversal. For example, the
battery polarity of the FXS port is +ve for TIP and -ve for RING in
speech condition. Now when call gets disconnected in the
system, the Battery polarity of the FXS port will be reversed.
Now TIP will become -ve and Ring +ve i.e its normal condition
when user goes Off hook.
• Open Loop Disconnect: It can be used when call disconnection
is to be signaled in the form of Open Loop Disconnect pulse.
This signal is generated by removing the Battery (Current)
voltage on FXS port for the period of Open Loop Disconnect
Timer and then restoring it again. It is also programmable.
Thus the Polarity of the FXS port battery voltage is not changed.
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