Page 158 of 906 NT1R20 Off-Premise Station Analog Line card553-3001-211 Standard 3.00 August 2005used whenever the phone lines have to leave the building in which the switchis installed.The NT1R20 OPS analog line card provides:• line supervision• hookflash• battery reversalEach 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 descriptionThe line interface and common multiplexing circuitry is mounted on a 31.75cm 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-pinconnector shroud. A 25-pair amphenol connector below the card is cabled tothe cross connect terminal (also called the Main Distribution Frame (MDF)).Telephone lines from station equipment cross connect to the OPS analog linecard at the cross connect using a wiring plan similar to trunk cards.Self TestThe faceplate of the NT1R20 OPS analog line card is equipped with a redLED. When an OPS analog line card is installed, the LED remains lit for twoto 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 andenabled in software; then the LED goes out. If the LED continues to flash orremains weakly lit, replace the card. See Figure 21 on page 159.
