Computer Hardware Installation Guide

ManualsBrandsNortel Networks ManualsComputer HardwareCircuit Card 311

771

772

773

774

775

776

777

778

779

780

772 NT8D15 E and M Trunk card

Electrical speciﬁcations

This section lists the electrical speciﬁcations for the E and M Tr unk card.

The electrical characteristics of all trunk circuits are provided in Table 286

"Electrical characteristics of trunk cards" (page 772).

Table 285 "Electrical characteristics of E and M Trunk cards" (page 772) lists

the electrical characteristics of the trunk interface on the E and M Trunk card.

Table 285

Electrical characteristics of E and M Trunk cards

Characteristic

4-wire trunk 2-wire trunk

Signaling range Type I#160;#160; 150 ohms

#160;#160; #160;#160; Type

II#160;#160; 300 ohms loop

Type I#160;#160; 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

S20K

Effective loss See pad table (Table 306 "Pad

switching algorithm" (page

791))

See pad table (Table 306 "Pad

switching algorithm" (page 791))

Terminating impedance 600 ohms 600 ohms

Balance impedance N/A 600 ohms

Table 286

Electrical characteristics of trunk cards

Characteristic

DID Trunk

CO trunk

Nominal impedance 600 or 900 ohms, (selected by

software)

600 or 900 ohms, (selected by

software)

Signaling range 2450 ohms 1700 ohms

Signaling type Loop Ground or loop start

Far-end battery -42 to -52.5 V -42 to -52.5 V

Near-end battery N/A -42.75 to -52.5 V

Minimum loop current N/A 20 mA

Ground potential difference + 10 V + 3 V

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23 May 2008