553-AAA1141

Page 580 of 894 NT8D14 Universal Trunk card

Figure 126

Two-way, loop DR, TIE trunk call states – outgoing call to far-end PBX

Far end PBX

 

 

System (near) end

 

 

Ground on tip,

Low-resistance

High-resistance

 

battery on ring

loop

loop

 

 

Near end

 

 

 

disconnects

 

Groundon tip, batteryon ring

Idle

first

 

 

 

 

Battery-ground

Near end

 

or loop pulse

disconnects

originates

or DTMF

disconnects

 

 

Near end

 

Far end

 

Near end

Far end

Far end

 

answers

 

hangs up

disconnects

 

(no ans sup)

 

(Note)

first

 

 

on tip,

on ring

(ans sup)

first

Battery

ground

 

 

Far end

Near end

 

 

answers

disconnects

Note: Where no far-end answer supervision is provided, party at near end hangs up after recognizing far-end call termination.

553-3001-211 Standard 2.00 September 2004

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