Physical description – Nortel Networks Circuit Card User Manual
Page 629
NT8D15 E&M Trunk card
Page 629 of 906
Circuit Card
Description and Installation
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.
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.