Nortel Networks Circuit Card - Manual (Page 590)

Page 590 of 906 NT8D14 Universal Trunk card
553-3001-211 Standard 3.00 August 2005
Figure 127
Two-way, loop DR, TIE trunk call states – outgoing call to far-end PBX
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
Battery-ground
or loop pulse
or DTMF
Near end
originates
Idle
Near end
hangs up
(Note)
Near end
disconnects
first
Near end
disconnects
first
Near end
disconnects
Far end
disconnects
Far end
disconnects
first
Far end
answers
(no ans sup)
Far end
answers
(ans sup)
553-AAA1141
Low-resistance
loop
Note: Where no far-end answer supervision is provided, party at near end hangs
up after recognizing far-end call termination.