Nortel Networks 311

Operation 593

is ready to receive digits, it returns dial tone. Outward address signaling is

then applied from the Meridian 1 in the form of loop (interrupting) dial pulses

or DTMF tones.

For outgoing calls, the software sends an outgoing seizure message to

place a low-resistance loop across the tip and ring leads toward the CO.

See Figure 159 "Ground start call states - incoming call" (page 601) and

Figure 160 "Ground start call connection sequence - incoming call" (page

602). When the CO detects the low-resistance loop, it prepares to receive

digits.When the CO is ready to receivedigits, it returns a dial tone. Outward

address signaling is then applied from the CS 1000 in the form of loop

(interrupting) dial pulses or DTMF tones.

For outgoing calls from a telephone set or attendant console, software

sends an outgoing seizure message to place a low resistance loop across

the tip and ring leads towards the CO. When the CO is ready to receive

digits, it returns dial tone. The outward address signaling is applied from the

system in the form of DTMF tones or dial pulses.

Polarity-sensitive/-insensitive packs feature The CS 1000 software

provides the polarity-sensitive/polarity-insensitive (PSP and PIP) packs

feature for the accuraterecording 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 answersuper vision from the far-end.

For trunks not equipped with answer supervision, the PIP class of service

is enabled and call-duration recording begins immediately upon near-end

trunk seizure. The PSP and PIP classes of service are enabled in the Trunk

Administration program LD 14.

The Meridian 1 software provides the Polarity-Sensitive/Insensitive Packs

(PSP and PIP) 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 answersuper vision from the far-end.

For trunks not equipped with answer supervision, the PIP class of service

is enabled and call-duration recording begins immediately upon near-end

trunk seizure.

The PSP and PIP classes of service are enabled in the Trunk Administration

program (LD 14).

Nortel Communication Server 1000

Circuit Card Reference

NN43001-311 01.04 Standard

Release 5.0 23May 2008