NT8D14 Universal Trunk card Page 587 of 894

Figure 131

Two-way, loop OAID, TIE trunk call states – incoming call from far-end PBX

 

System (near) end

 

Ground on tip,

Battery on tip,

 

battery on ring

ground on ring

 

Idle

 

 

Forced

 

loop

near end

 

disconnects

 

 

 

-resistance

 

Far end

 

disconnects

Far end

first

disconnect

 

High

 

 

end

 

 

Far

 

Near end

 

disconnects

loop

 

 

first

 

 

Low-resistance

Battery-ground

 

or loop pulses,

Near end

or DTMF

answers

Far end

 

 

 

 

originates

 

 

 

553-AAA1145

Circuit Card Description and Installation

Page 586 Page 588
Page 587
Image 587
Nortel Networks 553-3001-211 manual Resistance Far end, Far end First Disconnect High End, Or Dtmf, Far end Originates
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