Matrix Visionpro System Manual page 44

Generally, most telephone instruments that are connected have nominal characteristics with AC
impedance of 600. However, the VISIONPRO allows you to connect instruments with AC impedance
other than 600.
• Transmit Gain and Receive Gain: You can increase or decrease the level of Outgoing Speech (Transmit
Gain) and Incoming Speech (Receive Gain) on the SLT port by changing the Tx Gain and Rx Gain
respectively to the desired level. Different levels can be set for each port.
• Answer Signaling: An 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 has matured.
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 an SLT port, when an outgoing
call is made from that SLT port to any other port, for example, CO port and the called party (remote party)
answers, the Public Network provides an Answer Signal to the trunk port to indicate call maturity.
This signal can be passed on to the SLT port to indicate 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.
To generate Answer Signaling on the SLT Port, select Polarity Reversal. Select 'None' if Answer Signaling
is not required to be generated on the SLT port.
• Disconnect Signaling: 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 an SLT port, when an outgoing call is
made from that SLT port to any other port, say, CO port and the called party (remote party) disconnects
(goes ON Hook), the Public Network provides a Disconnect Signal to trunk port to indicate call
disconnection. This signal can be generated on the SLT port to indicate the PCO machine/Billing
equipment connected to this port to consider the call as disconnected and stop billing. Thus, Disconnect
Signaling on the SLT port helps prevent excessive billing.
VISIONPRO supports two types of Disconnect Signals on the SLT Port:
• 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, 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
programmed 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 user gets Error
tone.
To generate Disconnect Signaling on the SLT Port, select Polarity Reversal or Open Loop as
appropriate. Select None if Disconnect Signaling is not required to be generated on the SLT port.
Matrix VISIONPRO System Manual 38