Nortel NT1R20 Description page 132

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553-3001-105 Standard 5.00 June 1999
NT5D11 Line-side T1 Interface Card
Disconnect supervision
The line-side T1 card supports far end disconnect supervision by opening the
tip side toward the terminal equipment upon the Meridian 1 system's
detecting a disconnect signal from the far end on an established call. The X11
software release 21 Supervised Analog Line Feature (SAL) must be
configured in overlay 10 for each line-side T1 port. At the prompt FTR
respond OSP <CR>, and against FTR respond ISP <CR>. The line-side T1
card treats OSP and ISP for both originating and terminating calls as hook
flash disconnect supervision, also known as cut-off disconnect. Originating
calls are outgoing from the terminal equipment. Terminating calls are
incoming to the terminal equipment. The line-side T1 card does not support
battery reversal answer and disconnect supervision on originating calls.
After you have configured the software, you are ready to power up the card
and verify the self test results. The STATUS LED on the faceplate indicates
whether or not the line-side T1 card has successfully passed its self test, and
therefore is functional. When the card is installed, this LED remains lit for
two to five seconds as the self-test runs. If the self-test completes
successfully, the LED flashes three times and remains lit until the card is
configured and enabled in software, when the LED goes out. The LED will
go out if either the motherboard or daughterboard is enabled by the software.
If the LED does not follow the pattern described or operates in any other
manner (such as continually flashing or remaining weakly lit), the card should
be replaced.