Nortel Networks NN43001-106 - Manual (Page 492)

492 B34 Codec Static Loss Plan Downloading
Some markets, however, require adjustments on the loss setting depending
on the call connection. This is referred to as Dynamic Pad Switching, or
Dynamic Loss Switching, and is addressed by the Dynamic Loss Switching
feature, which is described elsewhere in this publication. The B34 Codec
Static Loss Plan Downloading feature provides the basis for the Dynamic
Loss Switching feature; if Dynamic Loss Switching is enabled for a system,
Static Loss Plan Downloading is suppressed on that same system.
The transmission plan for each country follows the European
Telecommunications Standards Institute (ETSI) standard of loss values
(referred to as "new values"), or existing values (loss values currently
provided by existing cards in ETSI countries). New IPE cards must be
capable of accepting these existing values for use in existing systems, so as
to maintain port-to-port loss integrity.
Typically, existing (pre-Phase 8B) systems do not require flexible B34
equipped IPE cards unless their loss plans change; these systems use the
existing loss plans. New systems installed with Phase 8B software contain
only flexible B34 equipped IPE cards, and can use either existing loss plans
or the ETSI loss plans. Systems equipped with both flexible B34 equipped
IPE cards and non-B34 equipped IPE cards require type approval to be
secured under existing loss plan values.
The Static Loss Plan Download feature allows the selection of a loss plan
table which is either compliant with the old or the new loss plan for various
countries. The feature is supported on international IPE analog trunk cards
(XCOT, XFCOT, XDID, XCO/XDID, XFEM, or any trunk configured with
XTRK type of XCOT, XDID, or XFEM) with the right firmware support. In
special situations and with the right authorization, a customized table may
be defined.
When selecting a loss plan table, it is important to verify whether the
existing or ESTI mode is to be exhibited by the system (the "Feature
implementation" section explains how to install a loss plan table using LD
97). A Service Change interface allows an existing or ETSI table to be
selected by specifying a loss plan table number. If the loss plan needs to be
upgraded in the field or if a newly defined loss plan has to be installed, a
service change may be performed by an authorized craftsperson to enter
a table of customized loss plan values for each port type, or to customize
a pre-defined table by changing the table values. The table can then be
downloaded upon any of the following conditions:
• at system initialization for all units
• when a trunk or line card, or trunk or line unit is enabled
• when the XPEC is enabled
• when the IPE shelf is enabled
• when a configured card is reset
Nortel Communication Server 1000
Features and Services - Book 1 of 6 (A to B)
NN43001-106 01.04 Standard
Release 5.0 27 July 2007
Copyright © 2007, Nortel Networks
.