Nortel Networks Circuit Card 311 User Manual

Page 680

680

NT8D14 Universal Trunk card

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 255 "Jumper strap settings

- factory standard (NT8D14BA, NT8D14BB)" (page 698)

Table 256 "Jumper strap settings -

extended range (NT8D14BA, NT8D14BB, NT8D14BB Release 10 and up)" (page 698)

, and

Table

257 "Trunk types - termination impedance and balance network (NT8D14BA, NT8D14BB)" (page
699)

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 236

"Universal Trunk Card electrical characteristics" (page 680)

Table 236
Universal Trunk Card electrical characteristics

Characteristic

DID trunk

CO trunk

Terminal impedance

600 or 900 ohms (selected by
software)

Signaling range

2450 ohms

1700 ohms

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

01.04

Standard

Release 5.0

23 May 2008