Nortel Circuit Card Installation Manual page 587

Figure 125
Two-way, loop DR, TIE trunk call states – incoming call from far-end PBX
Note: Where no near-end answer supervision is provided, party at far end hangs up
after recognizing near-end call termination.
Ground on tip,
battery on ring
Idle
Far end
originates
Battery-ground
or loop pulse,
or DTMF
Far end
disconnects
first
Far end
disconnects
disconnects
NT8D14 Universal Trunk card
System (near) end
Far end
hangs up
(Note)
Near end
answers
(no ans
sup)
Near end
disconnects
Near end
Circuit Card
Page 587 of 906
Battery on tip,
ground on ring
Near end
answers
(ans sup)
first
Far end
disconnects
first
553-AAA1139
Description and Installation