Nortel Networks 553-3001-211 manual Physical description, Self Test

Page 156 of 894 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.

Physical description

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.

Self Test

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 page 157.

553-3001-211 Standard 2.00 September 2004