Matrix ETERNITY NE System Manual 123
SLT instruments also vary by the level of current they draw during the normal 'idle' state and when Flash is
dialed
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(the simulated idle state). So, when the Flash key of a SLT instrument is pressed, and if the
instrument draws a higher current than the threshold defined for the 'idle' state, the system will not be able
to detect Flash (i.e. ON-Hook state).
Consider this when changing the value of ON-Hook Detection Current. Define the value considering the
current drawn by your SLT instrument in idle state, as well as when Flash key is pressed.
• Select the appropriate Answer Signaling
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option: Polarity Reversal or None. Select Polarity Reversal to
generate Answer Signaling on the SLT port.
Select None, if no Answer Signaling is to be generated on the SLT port. Default: None.
• Select the Disconnect Signaling
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on the SLT port as Polarity Reversal or Open Look as appropriate.
Select None if Disconnect Signaling is not generated on the SLT port. Default: None.
• Polarity Reversal: Call Disconnection is signaled in the form of Polarity Reversal. The Battery polarity
of the SLT port will be reversed. For example, if the battery polarity of the SLT port is '+ve' for TIP and '-
ve' for RING in speech condition then on disconnection on other port, TIP will become '-ve' and Ring
'+ve'. When call is disconnected, user will get Error tone.
• Open Loop: Call Disconnection is signaled in the form of Open Loop Disconnect Pulse, whereby the
Battery voltage on the SLT port is removed for the duration of the Open Loop Disconnect Timer
configured for that SLT port and will be restored on the expiry of this Timer. However, the Polarity of
Battery Voltage on the SLT port is not changed. When call is disconnected, the SLT extension user gets
an Error tone.
• Set the Open Loop Disconnect Timer (msec), if you selected Open Loop Disconnect as Disconnect
Signaling on the SLT port.
Open Loop Disconnect Timer is the time period for which the system will remove Battery Voltage on the
SLT port and restore Battery Voltage on the expiry of the Timer to signal Call Disconnection. The range of
this timer is: 68 to 952 milliseconds. Default: 476 msec.
24. Dialing 'Flash' either with the 'Flash Key' or by pressing the Hook-switch causes the phone to go in ON-Hook state briefly for 600-
800 milliseconds. Thus ON-Hook state is simulated briefly. The SLT may draw a higher current when 'Flash' is dialed.
25. Answer Signal is a signal generated on the SLT port to indicate that the called party (remote party) has answered the call and the
call is now mature. Answer Signaling on the SLT port is particularly useful when there is a PCO machine or any Billing equipment
connected to the SLT port. With Answer Signaling enabled on a SLT port, during an outgoing call is made from that SLT port to any
other port - CO/Mobile/SIP- when the called party (remote party) answers, the Public Network provides an Answer Signal to the
trunk port to indicate call maturity. This information can be passed on to the PCO machine billing equipment in the form of Answer
Signaling. On detecting Answer Signaling the PCO machine billing equipment can start billing.
Answer Signaling is generated in the form of Polarity Reversal or Battery Reversal, whereby the Battery polarity of the SLT port
gets reversed. For example, if the battery polarity of the SLT port is +ve for TIP and -ve for RING in speech condition, then on call
maturity, TIP becomes -ve and Ring becomes +ve.
26. A 'Disconnect Signal' is the signal generated on the SLT port to indicate that the called party (remote party has disconnected the
call.
Disconnect Signaling on the SLT port is useful when there is a PCO machine or any Billing equipment connected to the SLT port.
With Disconnect Signaling enabled on a SLT port, during an outgoing call is made from that SLT port to any other port - CO/Mobile/
SIP - when the called party (remote party) disconnects, i.e. goes ON Hook, the Public Network provides a Disconnect Signal to
trunk port indicate call disconnection. This signal can be generated on the SLT port to indicate to the PCO machine/Billing equip-
ment connected to this port to consider the call as disconnected and stop billing. Thus, Disconnect Signaling on the SLT port helps
prevent excessive billing.
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