Nortel Networks 1000 User Manual

Page 596

596

NT8D14 Universal Trunk card

Table 209
NT8D14 Universal trunk card - trunk interface electrical characteristics (cont’d.)

Characteristic

CO/FX/WATS
trunks

DID or tie
trunks

RAN
trunks

Paging
trunks

DC signaling loop length
(max)

1700-ohms loop with
near-end battery of
–42.75 V

2450-ohms loop with
near-end battery of
–44 V

600/
900-ohms
loop

600 ohms
loop

Far-end battery

–42 to –52.5 V (Note
4)

–42 to –52.5 V

–42 to
–52 V

N/A

Minimum detected loop
current

20 mA

10 mA

N/A

Ground potential
difference

±3 V

±1 V

Low DC loop resistance
during outpulsing

<300 ohms

N/A

High DC loop resistance

Ground start

S 30k ohms;
loop start

S 5M ohms

N/A

Ring detection

17 to 33 Hz
40 to 120 V rms

N/A

Line leakage

S 30k ohms, tip-to-ring,
tip-to-ground, ring-to-ground

N/A

AC induction rejection

10 V rms, tip-to-ring,
tip-to-ground, ring-to-ground

N/A

Note 1: Selected in software.

Note 2: Selected by jumper strap settings on card. Refer to

Table 229 "Jumper strap settings

- factory standard (NT8D14BA, NT8D14BB)" (page 614)

Table 230 "Jumper strap settings -

extended range (NT8D14BA, NT8D14BB, NT8D14BB Release 10 and up)" (page 615)

, and

Table

231 "Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB)" (page
615)

for details.

Note 3: Loop start answer supervision introduced with vintage BA cards and Release 19 software.

Note 4: For loop extender application, the maximum voltage applied between tip and ring is –105 V
±5%. The minimum DC loop resistance for this type of application is 1800 ohms.

Electrical characteristics of the Universal Trunk Card are listed in

Table

210 "Universal Trunk Card electrical characteristics" (page 596)

Table 210
Universal Trunk Card electrical characteristics

Characteristic

DID trunk

CO trunk

Terminal impedance

600 or 900 ohms (selected by
software)

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008