Nortel Networks Circuit Card - Manual (Page 587)

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