Nortel Circuit Card Installation Manual page 585

Figure 123
DID trunk, loop DR call states – incoming call from CO
Note: The near end may be configured for immediate start, delay dial, or
wink start.
Ground on tip, battery on ring Battery on tip, ground on ring
Idle
Forced
near end
disconnect
Battery-ground
or loop pulsing
or DTMF
(Note)
Far end
originates
NT8D14 Universal Trunk card
System (near) end
Forced
far end
disconnect
Near end
disconnects
first
Circuit Card
Page 585 of 906
Far end
disconnects
first
Near end
answers
553-AAA1137
Description and Installation