Nortel Networks Video Gaming Accessories 553-3001-211 Manual De Usuario
NT8D14 Universal Trunk card
Page 597 of 894
Electrical specifications
Table 180 gives the electrical characteristics of the NT8D14 Universal Trunk
card.
card.
Table 180
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)
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)
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