Nortel Networks Circuit Card User Manual

 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 

.