NT8D14 Universal Trunk card Page 583 of 894

Figure 128

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

 

Ground on tip,

Battery on tip,

 

battery on ring

ground on ring

Idle

Far end

 

 

hangs up

 

 

(Note 4)

 

 

 

Far end

 

 

originates

Far end PBX

Low-resistance

loop

 

resistance

loop

 

High-

 

Battery-ground

Near end

 

or loop pulsing,

stores

 

or DTMF

office DN

Near end

(Note 1)

(Note 2)

answers

CO end

 

 

(ans sup)

answers

 

CO/FX/WATS

(Note 3)

(no ans sup)

 

ground start

 

 

 

 

disconnect

 

Far end

 

 

disconnects

 

 

first

 

 

Far end

 

Far end

disconnects

 

Near end

 

disconnects

 

first

disconnects

 

 

 

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.

553-AAA1143

Circuit Card Description and Installation

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Image 583
Nortel Networks 553-3001-211 manual Far end PBX Low-resistance Loop Resistance High, Co/Fx/Wats
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