Nortel Circuit Card Installation Manual page 592

Page 592 of 906
Figure 129
Two-way, loop DR, TIE trunk call states – outgoing call to far-end PBX
Note: Where no far-end answer supervision is provided, party at near end hangs
up after recognizing far-end call termination.
553-3001-211 Standard 3.00
NT8D14 Universal Trunk card
Ground on tip,
battery on ring
Idle
Near end
originates
Near end
hangs up
(Note)
August 2005
System (near) end
Low-resistance
loop
Near end
disconnects
first
Battery-ground
or loop pulse
or DTMF
Far end
answers
(no ans sup)
Far end
answers
(ans sup)
High-resistance
loop
Near end
disconnects
Far end
disconnects
Far end
disconnects
first
Near end
disconnects
first
553-AAA1141