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