Electrical Specifications - Nortel Circuit Card Installation Manual

Electrical specifications

Table 185
Universal trunk card – trunk interface electrical characteristics (Part 1 of 2)
Characteristic
Terminal impedance
Balance impedance
Supervision type
DC signaling loop
length (max)
Far-end battery
Minimum detected
loop current
Ground potential
difference
Low DC loop
resistance during
outpulsing
High DC loop
resistance
Ring detection
Table 185 gives the electrical characteristics of the NT8D14 Universal Trunk
card.
CO / FX / WATS
600 or 900 ohms
(Note 1)
600 or 900 ohms
(Note 1),
3COM, or 3CM2
(Note 2)
Ground or
loop start
(Note 3)
1700-ohm loop with
near-end battery of
–42.75 V
–42 to –52.5 V
(Note 4)
20 mA
±3 V
<300 ohms
Ground start
Š 30k ohms;
loop start
Š 5M ohms
17 to 33 Hz
40 to 120 V rms
NT8D14 Universal Trunk card
Trunk Types
DID / TIE
600 or 900 ohms
(Note 1)
600 or 900 ohms
(Note 1),
3COM, or 3CM2
(Note 2)
Loop start
(with ans sup)
(Note 3)
2450-ohm loop with
near-end battery of
–44 V
–42 to –52.5 V
10 mA
±3 V
N/A
N/A
N/A
Circuit Card
Page 609 of 906
RAN
600/900 ohms
(Note 1)
N/A
Continuous, level, or
pulse
600/900-ohm loop
–42 to –52 V
10 mA
±1 V
N/A
N/A
N/A
Description and Installation
Paging
600 ohms
N/A
N/A
600 ohm
loop
N/A
N/A
±1 V
N/A
N/A
N/A