286 Matrix ETERNITY NE System Manual
• None: When there this no signaling supported. Select this option only if there is no Disconnect
Supervision signal supported.
• Polarity Reversal: Call disconnection is signaled as Polarity Reversal when the call is
disconnected by the remote user. For example, if the battery polarity of the CO port is '+ve' for TIP
and '-ve' for RING in speech condition then on disconnection by the remote user, TIP will become '-
ve' and Ring '+ve'. The user gets an Error tone and the CO port is released.
• Open Loop Disconnect: Call Disconnection is signaled in the form of Open Loop, whereby the
Battery voltage on the CO port is removed for a short duration. Voltage is restored after this short
duration. However, the Polarity of Battery Voltage on the CO port is not changed.
This option is to be selected when call disconnection is signaled in the form of Open Loop
Disconnect pulse by the CO network. System will check Open Loop Disconnect signal for the time
duration set in Open Loop Disconnect Timer for each CO port. If the time of the Open Loop signal
detected is less than the Open Loop Disconnect Timer you have set, it will not be considered as
valid Open Loop signal for releasing the CO port. But if the Open loop is detected continuously for
at least for the duration of the Open Loop Disconnect timer, it is considered as a valid Disconnect
Supervision signal. The call will be released and caller will get error tone.
• Select the same Answer Supervision and Disconnect Supervision signal type supported by your CO
network for the CO ports. Consider the following case:
• The CO network supports Polarity Reversal signal as Answer and Disconnect Supervision.
• But you have selected 'Pseudo Answer' as Answer Supervision signal and 'Polarity Reversal' as
Disconnect Supervision signal for the CO ports in the system.
• In this case, when a call is made through the CO port, the call will be considered as matured after
the Pseudo Answer Supervision Timer.
• Now, when the called party answers the call, the CO generates 'Polarity Reversal' as answer
supervision signal on the CO port.
• But as 'Polarity Reversal' is also selected as the Disconnect Supervision for the port, the system will
interpret this (Answer Signaling) signal as Disconnect Supervision signal and disconnect the call.
• If you have selected Open Look Disconnect as Disconnect Supervision type, configure the Open Loop
Disconnect Timer. The range of this timer is from 17 to 986 milliseconds. Default: 204 ms.
• If Call Disconnection is signaled by your CO Network in the form of Disconnect Tone, configure
Disconnect Tone Detection.
To enable the system to detect the Disconnect Tone accurately, select the Enable Disconnect Tone
Detection check box and configure the Cadence (ON-OFF time) and Frequency of the Disconnect Tone,
as supported by the CO network.
• Frequency 1 (Hz): Frequency 1 is from 300 to 1400 Hz.
61. It is a signal from the CO network to indicate call disconnection. Whenever a call (incoming or outgoing) made from the CO Trunk
is disconnected by the remote party, the CO network will send Disconnect signal to the CO port. SARVAM UCS will detect this sig-
nal and release the CO port.
Disconnect Supervision signal is important when a PCO machine is connected to the (SLT Port) SARVAM UCS.
In such application scenarios, it is desirable that calls that are disconnected by either end - calling party or called party - is termi-
nated by the system and the port is released. If the called (remote) party has disconnected the call but the calling party (extension
that made the outgoing call from SARVAM UCS) has not disconnected the call, the call remains live within the system.
So, Disconnect Supervision signal is important, particularly when calls are routed from CO-to-CO ports, to indicate to the system
that it needs to disconnect the call and release the port.
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