Nortel Networks Circuit Card User Manual
Page 136 of 906
Option settings
QPC43 Peripheral Signaling card
QPC71 E&M/DX Signaling and Paging Trunk cards
Options (minimum vintage N)
Plug location
NT5D21 Core/Network module
NT8D35 Network module
F13
Application
Unit 0 E35 switch
Unit 1 E5 switch
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
E&M
off
off
off
on
off
off
on
off
off
off
off
on
off
off
on
off
Paging
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
DX 2-wire
(conductor
loop <
2.5 K ¾)
(conductor
loop <
2.5 K ¾)
on
on
off
off
off
on
off
on
on
on
off
off
off
on
off
on
DX 2-wire
(conductor
loop >
2.5 K ¾)
(conductor
loop >
2.5 K ¾)
on
on
on
on
off
on
off
on
on
on
on
on
off
on
off
on
DX 4-wire
(conductor
loop <
2.5 K ¾)
(conductor
loop <
2.5 K ¾)
off
off
off
off
on
on
off
on
off
off
off
off
on
on
off
on
DX 4-wire
(conductor
loop >
2.5 K ¾)
(conductor
loop >
2.5 K ¾)
off
off
on
on
on
on
off
on
off
off
on
on
on
on
off
on
Note: DX trunks must be balanced correctly. If the loop is <2.5 K ¾, far-end balancing is
standard. If the loop is >2.5 K ¾, far end balancing requires standard plus 2.5 K ¾. To connect
PBX to PBX, switches should be arranged for loops to be >2.5 K ¾ at one end and <2.5 K ¾ at
the other. Apply similar treatment when connecting to Pulse QPJ69 trunks.
standard. If the loop is >2.5 K ¾, far end balancing requires standard plus 2.5 K ¾. To connect
PBX to PBX, switches should be arranged for loops to be >2.5 K ¾ at one end and <2.5 K ¾ at
the other. Apply similar treatment when connecting to Pulse QPJ69 trunks.