Electrical Specifications - Nortel Circuit Card Installation Manual

Page 652 of 906
Table 201
DX signaling – incoming calls with originating party release on tandem connections
(Part 2 of 2)
Condition
If no answer supervision: CO end disconnects (if
a CO ground start – the trunk is idled and network
taken down, but the incoming TIE trunk is held
under control of the originating end)
Originating end disconnects – network taken
down and trunk idled

Electrical specifications

Table 202
Electrical characteristics of E&M trunk cards (Part 1 of 2)
Characteristic
Signaling range
Signaling type
Far-end battery
Near-end battery
Ground potential difference
Line leakage between E lead
and ground
553-3001-211 Standard 3.00
NT8D15 E&M Trunk card
Note: * – CO ground start: the trunk is idled and the network taken
down, but the incoming tie trunk is controlled by the originating end.
Table 202 lists the electrical characteristics of the trunk interface on the E&M
trunk card.
4-wire trunk
Type I
Type II
Type I, Type II
–42 to –52.5 V dc
–42.75 to –52.5 V dc
+10 V dc
Š20K¾
August 2005
Current in
signaling lead
Current flow
No current flow
150 ohms
300 ohms loop
State of trunk
detector
Low
High
2-wire trunk
Type I 150 ohms
Type I
–42 to –52.5 V dc
–42.75 to –52.5 V dc
+10 V dc
Š20K¾