Nortel Networks 1000 User Manual

Page 593

Electrical specifications

593

Table 207
Universal trunk card - trunk interface electrical characteristics

Trunk Types

Characteristic

CO / FX / WATS

DID / TIE

RAN

Paging

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)

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)

Continuous,
level, or pulse

N/A

DC signaling loop
length (max)

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

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

600/900-ohm
loop

600 ohm
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 ˇ

N/A

Ring detection

17 to 33 Hz 40 to
120 V rms

N/A

Note 1: Selected in software.

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

Table 224 "Jumper strap settings -

factory standard (NT8D14BA, NT8D14BB)" (page 607)

Table 225 "Jumper strap settings - extended

range (NT8D14BA, NT8D14BB, NT8D14BB)" (page 608)

, and

Table 226 "Trunk types - termination

impedance and balance network (NT8D14BA, NT8D14BB)" (page 608)

for details.

Note 3: 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.

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311

02.06

Standard

27 August 2008