Physical Description - Nortel Circuit Card Installation Manual

Page 158 of 906

Physical description

Self Test
553-3001-211 Standard 3.00
NT1R20 Off-Premise Station Analog Line card
used whenever the phone lines have to leave the building in which the switch
is installed.
The NT1R20 OPS analog line card provides:
• line supervision
• hookflash
• battery reversal
Each unit is independently configured by software control in the Analog (500/
2500 type) Telephone Administration program LD 10.
You can install this card in any IPE slot.
The line interface and common multiplexing circuitry is mounted on a 31.75
cm by 25.40 cm (12.5 in. by 10 in.) printed circuit board.
The OPS analog line card connects to the IPE backplane through a 160-pin
connector shroud. A 25-pair amphenol connector below the card is cabled to
the cross connect terminal (also called the Main Distribution Frame (MDF)).
Telephone lines from station equipment cross connect to the OPS analog line
card at the cross connect using a wiring plan similar to trunk cards.
The faceplate of the NT1R20 OPS analog line card is equipped with a red
LED. When an OPS analog line card is installed, the LED remains lit for two
to five seconds while the self-test runs. If the self-test completes successfully,
the LED flashes three times and remains lit. When the card is configured and
enabled in software; then the LED goes out. If the LED continues to flash or
remains weakly lit, replace the card. See Figure 21 on
August 2005
page 159.