122 Matrix ETERNITY NE System Manual
• Define the Digit padding for Caller ID according to number of digits supported by the telephone
instrument connected to the SLT port.
Certain SLT instruments that support CLI require a minimum number of digits in the calling party's number
to be able to identify and display it. The Minimum Caller ID Digits are the number of zeroes to be added to
the calling party's number before displaying it on the called party's instrument.
• Select the appropriate Ringing Signal to match the type of ringing current expected by the telephone
instrument connected to the SLT port.
You may select from these Ring Types: Sinusoidal, Trapezoidal, Low Sinusoidal, Low Trapezoidal.
Default: Trapezoidal.
• Increase or decrease the Loop Current (mA) according to the Loop Length
23
, i.e. the length of the
telephone cable between the wall jack (into which the SLT telephone instrument is plugged) and the SLT
port.
The SLT Port provides the telephone instrument connected to it Loop Current of 25, 30, 35 and 40 mA.
Default: 25mA, which is sufficient to support Loop Length of 1 kilometer.
• Select the Loop Length as Upto 5 Km or Above 5 Km according to your installation scenario. The Loop
Length is the distance between the Central Office and the telephone instrument connected to the SLT port.
• Set the value of the OFF-Hook Current (minimum) according to the current drawn by the SLT instrument
connected to the SLT port.
SARVAM UCS supports OFF-Hook detection for all types and brands of SLT instruments by providing for
configurable values for threshold current for OFF-Hook detection: 10mA, 12mA, 14mA, 16mA and 18mA.
Default: 12mA.
When a SLT instrument draws current equal to or greater than the configured threshold value of current for
OFF-Hook detection, SARVAM UCS will consider the SLT instrument as OFF-Hook and will offer dial tone
to the SLT.
• Set the value of ON-Hook Detection (maximum) according to the current drawn by the SLT instrument
connected to the SLT port.
SARVAM UCS detects ON-Hook state of for all types and brands of SLT instruments by providing for
configurable values for threshold current for ON-Hook detection: 10mA, 12mA, 14mA, 16mA and 18mA.
Default: 10mA.
When a SLT instrument draws current equal to or lower than the configured threshold value of current for
ON-Hook detection, SARVAM UCS will consider the SLT instrument as ON-Hook and routes calls to this
port.
23. The longer the Loop Length of the SLT port, the greater the likelihood of current dissipation, affecting speech quality of the tele-
phone instrument connected to the SLT port. Change the Loop Current according to the Loop Length of the SLT instrument con-
nected to the port.
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