Figure 129 on – Nortel Networks Circuit Card User Manual

Page 592

Page 592 of 906

NT8D14 Universal Trunk card

553-3001-211 Standard 3.00 August 2005

Figure 129
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.