See figure 133 on – Nortel Networks Circuit Card User Manual

Page 598

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Page 598 of 906

NT8D14 Universal Trunk card

553-3001-211 Standard 3.00 August 2005

Figure 133
Two-way, loop DR, TIE trunk call states – outgoing call through far-end PBX to CO/FX/WATS

System (near) end

Far end

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 pulses,

or DTMF

Near end

originates

Dial

tone

Idle

Near end
hangs up

(Note 3)

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)

Universal service

provided by far

end PBX if

originating end is

senderized

553-1144

Low-resistance

loop

(Note 1)

(Note 2)

Note 1

: Immediate-start outpulsing.

Note 2:

Delay-dial or wink-start outpulsing after go signal.

Note 3:

Where no far-end answer supervision is provided, party at near end

hangs up after recognizing far-end call termination.

Stop

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