Computer Hardware Installation Guide

Electrical specifications 773
Characteristic
DID Trunk
CO trunk
Low DC loop resistance during
outpulsing
N/A 300 ohms
High DC loop resistance N/A Ground start equal to or greater
than 30 kS. Loop start equal to
or greater than 5 MS
Line leakage Equal to or greater than 30 kS
(Tip to Ring, Tip to GND, Ring
to GND).
Equal to or greater than 30 kS
(Tip to Ring, Tip to GND, Ring
to GND)
Effective loss See pad table See pad table
Table 287 "Electrical characteristics" (page 773) lists the electrical
characteristics of the trunk interface on the E and M Trunk card.
Table 287
Electrical characteristics
Characteristic
4-wire trunk 2-wire trunk
Signaling range Type I 150 ohms
Type II 300 ohms loop
Type I 150 ohms
Signaling type Type I, Type II Type I
Far-end battery –42 to –52.5 V dc –42 to –52.5 V dc
Near-end battery –42.75 to –52.5 V dc –42.75 to –52.5 V dc
Ground potential difference ±10 V dc ±10 V dc
Line leakage between E lead and
ground
ˇ
S20K
1
/2
³20K
1
/2
Effective loss See pad table (Table 307
"Pad switching algorithm"
(page 792))
See pad table (Table 307
"Pad switching algorithm"
(page 792))
Terminating impedance 600 ohms 600 ohms
Balance impedance N/A 600 ohms
Table 287 "Electrical characteristics" (page 773) lists the electrical
characteristics of the trunk interface on the E and M Trunk card.
Table 288
Electrical characteristics of the E and M Trunk interface
Characteristic
4-wire trunk 2-wire trunk
Signaling range Type I 150 ohms
Type II 300 ohms loop
Type I 150 ohms
Signaling type Type I, Type II Type I
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.