Nortel Networks 553-3001-211 manual NT8D15 E&M Trunk card Page 617

NT8D15 E&M Trunk card Page 617 of 894

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 E&M trunk card connects to the backplane through a 160-pin connector shroud. External equipment connects to the card at the back of the MG 1000S using a 25-pin connector. Telephone lines from station equipment cross connect to the OPS analog line card at the MDF using a wiring plan similar to that used for line cards. See Communication Server 1000S: Installation and Configuration (553-3031-210) for termination and cross connect information.

Each card provides four circuits. Each circuit connects with the switching system and with the external apparatus by an 80-pin connector at the rear of the pack. Each trunk circuit on the card connects to trunk facilities by tip an ring leads which carry voice, ringing, tone signaling and battery. Trunk option selection is determined by software control in LD 14.

Figure 139 on page 618 illustrates the faceplate of the E&M trunk card. The words “Dict Trk” appear on the faceplate label because earlier versions of this card provided dictation trunk connections for third-party equipment.

The faceplate of the card is equipped with a red LED. When an E&M trunk 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.

Circuit Card Description and Installation