Nortel Networks 311 사용자 설명서
Electrical specifications
677
Table 233
Universal trunk card - trunk interface electrical characteristics
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)
(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)
start (Note 3)
Loop start (with
ans sup) (Note 3)
ans sup) (Note 3)
Continuous,
level, or pulse
level, or 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
with near-end
battery of –44 V
600/900-ohm
loop
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
ˇ
S 30k ohms;
loop start
loop start
ˇ
S 5M ohms
N/A ˇ
S
N/A
N/A
Ring detection
17 to 33 Hz 40 to
120 V rms
120 V rms
N/A
N/A
N/A
Note 1: Selected in software.
Note 2: Selected by jumper strap settings on card. Refer to
,
, and
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.
±5%. The minimum dc loop resistance for this type of application is 1800 ohms.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.