88 Matrix ETERNITY NE System Manual
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.
6. 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.
7. Increase or decrease the Loop Current (mA) according to the Loop Length
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, 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.
8. Set the value of the OFF-Hook Current (minimum) according to the current drawn by the SLT instrument
connected to the SLT port.
ETERNITY NE 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 an SLT instrument draws current equal to or greater than the configured threshold value of current
for OFF-Hook detection, ETERNITY will consider the SLT instrument as OFF-Hook and will offer dial tone
to the SLT.
9. Set the value of ON-Hook Detection (maximum) according to the current drawn by the SLT instrument
connected to the SLT port.
ETERNITY 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 an SLT instrument draws current equal to or lower than the configured threshold value of current for
ON-Hook detection, ETERNITY will consider the SLT instrument as ON-Hook and routes calls to this port.
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 an 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.
19. 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.
20. 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.
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