Electrical specifications – Nortel Networks 1000 User Manual
Page 691
Electrical specifications
691
Table 258
DX signaling - incoming calls with originating party release on tandem connections (cont’d.)
Condition
Current in
signaling lead
State of trunk
detector
If no-answer supervision is enabled, CO end
disconnects
Current flow
Low
Originating end disconnects – network torn
down and trunk idled
No current flow
High
Note:
* – CO ground start: the trunk is idled and the network taken
down, but the incoming tie trunk is controlled by the originating end.
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
"Electrical characteristics of trunk cards" (page 692)
.
Table 259 "Electrical characteristics of E and M Trunk cards" (page
691)
lists the electrical characteristics of the trunk interface on the E and M
Trunk card.
Table 259
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
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
ˇ
S20K
3
/
4
ˇ
S20K
3
/
4
Effective loss
See pad table (
switching algorithm" (page
709)
)
See pad table (
switching algorithm" (page
709)
Terminating impedance
600 ohms
600 ohms
Balance impedance
N/A
600 ohms
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.