184 Matrix ETERNITY NE System Manual
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.
11. If you selected Open Look Disconnect as Disconnect Supervision type, configure the Open Loop
Disconnect Timer. The range of this timer is from 001 to 999 milliseconds. Default: 200 ms.
12. If Call Disconnection is signalled by your CO Network in the form of Disconnect Tone, configure
Disconnect Tone Detection.
To enable the system to detect the Disconnect Tone accurately, you must 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.
• Operator: This parameter has 3 options: No operator, Modulation (*), Addition (+)
If No operator is selected, frequency 2 will not be applicable.
If Modulation is selected, frequency 1and frequency 2 will be used as modulation i.e. F1* F2
If Addition is selected, frequency 1 and frequency 2 will be used as addition i.e. F1 + F2.
• Frequency 2 (Hz): Frequency 2 is from 20 to 1400 Hz. Select Frequency 2 if the Disconnect Tone
supported by the CO network consists of Dual Frequency.
• First Cycle Cadence - ON Time 1 (msec), OFF Time 1 (msec): Cadence is configurable from 0040-4000
msec for ON Time 1 and OFF Time 1.
• Subsequent Cycles: ON Time 2 (msec), OFF Time 2 (msec): Cadence is configurable from 0040-4000
msec for ON Time 2 and OFF Time 2.
When disconnect tone is detected on port matches the Frequency and Cadences you have configured, the
call will be disconnected and the CO port will be released.
13. Configure DTMF Out Dial parameters. While dialing out the DTMF digits from the CO port, the following
attributes of DTMF signal
50
are critical.
• DTMF Signal ON Time (msec): It is the width of DTMF digit to be dialed out by the CO port. Set the
ON time to the desired value. Default: 102 milliseconds.
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