Nortel Networks 311 사용자 설명서
772
NT8D15 E and M Trunk card
Electrical specifications
This section lists the electrical specifications for the E and M Trunk card.
This section lists the electrical specifications for the E and M Trunk card.
The electrical characteristics of all trunk circuits are provided in
.
lists
the electrical characteristics of the trunk interface on the E and M Trunk card.
Table 285
Electrical characteristics of E and M Trunk cards
Electrical characteristics of E and M Trunk cards
Characteristic
4-wire trunk
2-wire trunk
Signaling range
Type I#160;#160; 150 ohms
#160;#160; #160;#160; Type
II#160;#160; 300 ohms loop
#160;#160; #160;#160; Type
II#160;#160; 300 ohms loop
Type I#160;#160; 150 ohms
Signaling type
Type I, Type II
Type I
Far-end battery
–42 to –52.5 V dc
–42 to –52.5 V dc
Near-end battery
–42.75 to –52.5 V dc
–42.75 to –52.5 V dc
Ground potential difference
±10 V dc
±10 V dc
Line leakage between E lead
and ground
and ground
ˇ
S20K
3
/
4
ˇ
S20K
3
/
4
Effective loss
See pad table (
See pad table (
)
Terminating impedance
600 ohms
600 ohms
Balance impedance
N/A
600 ohms
Table 286
Electrical characteristics of trunk cards
Electrical characteristics of trunk cards
Characteristic
DID Trunk
CO trunk
Nominal impedance
600 or 900 ohms, (selected by
software)
software)
600 or 900 ohms, (selected by
software)
software)
Signaling range
2450 ohms
1700 ohms
Signaling type
Loop
Ground or loop start
Far-end battery
-42 to -52.5 V
-42 to -52.5 V
Near-end battery
N/A
-42.75 to -52.5 V
Minimum loop current
N/A
20 mA
Ground potential difference
+ 10 V
+ 3 V
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.