553-AAA1133

Page 562 of 894 NT8D14 Universal Trunk card

Figure 112

Loop start call states – incoming call from CO/FX/WATS

System (near) end

 

 

High-resistance loop

Low-resistance loop

 

tip,battery on ring

Idle

Near end

 

 

 

disconnects

 

 

WATS/ (far)end

 

Dial tone after

 

 

 

Far end

Forced far end

far end timeout

 

disconnects

 

disconnect

 

 

 

first

 

Near end

 

 

 

(Note 2)

 

disconnects

 

 

 

 

 

first

 

 

FX

on

 

(Note 3)

 

 

 

 

 

 

CO/

Ground

Far end

 

Near end answers,

originates

 

ringing is removed

 

 

by ringing

 

(Note 1)

 

Note 1: The originating office may reverse battery and ground when attendant answer is received.

Note 2: No disconnection signal is passed to trunk.

Note 3: The near end provides a high-impedance (>150k ohms) disconnect signal of at least 50 ms before reconnecting the ground detector.

receive digits, it returns a dial tone. Outward address signaling is then applied from the system in the form of loop (interrupting) dial pulses or DTMF tones.

Polarity-sensitive/-insensitive packs feature

The CS 1000 Release 4.0 software provides the polarity-sensitive/ polarity-insensitive (PSP and PIP) packs feature for the accurate recording of outgoing call duration for loop start and ground start operation.

On trunks equipped with far-end answer supervision, the PSP class of service is enabled in software and causes call-duration recording in CDR records to begin only upon receipt of answer supervision from the far-end.

553-3001-211 Standard 2.00 September 2004

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Nortel Networks 553-3001-211 manual Polarity-sensitive/-insensitive packs feature, WATS/ farend
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