NT8D15 E&M Trunk card Page 631 of 894

Figure 146

E&M Type I signaling patterns – originating party release

lead

Open

Near end E

Ground

 

Near end M lead

 

 

Ground

 

Battery

Idle

 

 

Near end

Dialing

 

seizes

 

 

 

DT

 

 

 

 

 

 

 

Far

Far end

 

 

 

answers

 

 

 

end

Far

 

 

(no ans

Near

 

disc

end

 

sup)

 

first

disc

end disc

 

 

 

 

 

Near end

Far end

answers

disc first

(ans sup)

 

lead

Open

Near end E

Ground

Outgoing calls from near end

Near end M lead

GroundBattery

Near end

 

disc

 

Idle

Far end

Far end

disc first

 

disc

 

Dialing

 

Near end

Near end

disc first

Far

answers

end

(ans sup)

seizes

 

Near end ans

 

(no ans sup)

 

Incoming calls to near end

553-6263

Circuit Card Description and Installation

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Nortel Networks 553-3001-211 manual Type I signaling patterns originating party release, Outgoing calls from near end
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