Figure 131 on – Nortel Networks Circuit Card User Manual
Page 595
NT8D14 Universal Trunk card
Page 595 of 906
Circuit Card
Description and Installation
Figure 131
Two-way, loop DR, TIE trunk call states – incoming call through senderized, tandem PBX
from a CO/FX/WATS trunk
System (near) end
Ground on tip,
battery on ring
Battery on tip,
ground on ring
Battery-ground
or loop pulsing,
or DTMF
(Note 1)
Far end
originates
Idle
Far end
hangs up
(Note 4)
Far end
disconnects
first
Far end
disconnects
first
Far end
disconnects
Near end
disconnects
CO/FX/WATS
ground start
disconnect
Near end
stores
office DN
(Note 2)
Near end
answers
(ans sup)
(Note 3)
CO end
answers
(no ans sup)
553-AAA1143
Note 1:
Dial CO/FX/WATS and office DN.
Note 2:
If ground start trunk, outpulse toward office after ground detection.
If loop start trunk, outpulse toward office 1 second later.
Note 3
: Pseudo-answer supervision is provided by near end at expiration of
end-of-dial timer.
Note 4:
Where no far-end answer supervision is provided, party at far end
hangs up after recognizing near-end call termination.
Far end PBX
High-resistance
loop
Ground on tip,
battery on ring
Low-resistance
loop