Nortel Circuit Card Installation Manual page 643

Figure 149
E&M Type I signaling patterns – originating party release
NT8D15 E&M Trunk card
Near end M lead
Ground
Idle
Dialing
Far
Near
end
end disc
disc
Near end
disc first
Outgoing calls from near end
Near end M lead
Ground
Near end
disc
Idle
Far end
disc
Near end
disc first
Far
end
seizes
Near end ans
(no ans sup)
Incoming calls to near end
Battery
Near end
seizes
DT
Far end
Far
answers
end
(no ans
disc
sup)
first
Far end
answers
(ans sup)
Battery
Far end
disc first
Near end
answers
(ans sup)
553-6263
Circuit Card Description and Installation
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