NT8D14 Universal Trunk card Page 573 of 894

Figure 120

DID trunk, loop DR call states – incoming call from CO

CO (far) end

 

System (near) end

 

Ground on tip, battery on ring

Battery on tip, ground on ring

 

Idle

 

 

Forced

 

loop

near end

 

disconnect

 

resistance

far end

first

 

Forced

Far end

 

disconnects

 

 

-

disconnect

 

High

 

 

 

 

Near end

 

 

disconnects

loop

 

first

Battery-ground

 

 

 

resistance-

or loop pulsing

 

or DTMF

Near end

 

 

(Note)

 

 

answers

Low

Far end

 

originates

 

Note: The near end may be configured for immediate start, delay dial, or wink start.

553-AAA1137

Circuit Card Description and Installation

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Nortel Networks 553-3001-211 manual Loop, Low
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