Nortel Networks 1000 User Manual

Page 595

Electrical specifications

595

Table 208
Universal trunk card - trunk interface electrical characteristics (cont’d.)

Characteristic

CO/FX/WATS
trunks

DID or TIE
trunks

RAN
trunks

Paging
trunks

Ground potential difference

±3 V

±1 V

Low DC loop resistance
during outpulsing

<300 ohms

N/A

High DC loop resistanc
e ˇ

S ˇ

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.

Table 208 "Universal trunk card - trunk interface electrical characteristics"
(page 594)

gives the electrical characteristics of the NT8D14 Universal

Trunk Card.

Table 209
NT8D14 Universal trunk card - trunk interface electrical characteristics

Characteristic

CO/FX/WATS
trunks

DID or tie
trunks

RAN
trunks

Paging
trunks

Terminal impedance

600 or 900 ohms (Note 1)

600/900
ohms
(Note 1)

600 ohms

Balance impedance

600 or 900 ohms (Note 1), 3COM, or 3CM2
(Note 2)

N/A

Supervision type

Ground or loop start
(Note 3)

Loop start (with ans
sup) (Note 3)

Continuou
s, level, or
pulse

N/A

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008