NT8D15 E&M Trunk card Page 635 of 894

Figure 148

E&M Type II signaling patterns – originating party release

leads

Open

Near end EA/EB

Closed

 

Near end M/SB leads

Open

Closed

Idle

 

 

Near

Dialing

 

DT end

 

 

 

seizes

 

 

Far

Far end

 

 

answers

 

 

end

Far

 

(no ans

System

disc

end

sup)

first

disc

end disc

 

 

 

Near end

Far end

answers

disc first

(ans sup)

 

Outgoing calls from system (near end)

leads

Open

Near end EA/EB

Closed

Near end M/SB leads

Open

Closed

Near end

 

disc

 

Idle

Far end

Far end

disc first

 

disc

 

Dialing

 

Near end

Near end

disc first

Far

answers

end

(COS-ans sup)

seizes

 

Near end ans

 

(COS-no ans sup)

 

Incoming calls to system (near end)

553-AAA1153

Circuit Card Description and Installation

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