Nortel Circuit Card, Installation Manual, Page: 652 / 908

Page 652 of 906 NT8D15 E&M Trunk card
553-3001-211 Standard 3.00 August 2005
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
Table 202 lists the electrical characteristics of the trunk interface on the E&M
trunk card.
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) Current flow Low
Originating end disconnects – network taken
down and trunk idled No current flow High
Table 202
Electrical characteristics of E&M trunk cards (Part 1 of 2)
Characteristic 4-wire trunk 2-wire trunk
Signaling range Type I 150 ohms
Type II 300 ohms loop
Type I 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 Š20K¾ Š20K¾
Table 201
DX signaling – incoming calls with originating party release on tandem connections
(Part 2 of 2)
Condition
Current in
signaling lead State of trunk
detector