Nortel Circuit Card 311 Reference page 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 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 receive digits, 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 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.
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 answer supervision 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).
Copyright © 2003-2008, Nortel Networks
.
Figure 159 "Ground start call states - incoming call" (page 601)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Operation 593
and