Nortel-networks NN43001-106 Manual de usuario descargar pdf (Pagina 500)

500 B34 Dynamic Loss Switching

Typically, there are different vintages of ﬁrmware in the ﬁeld:

•

hard-coded B34 ﬁrmware, which is hardcoded with country-speciﬁc

defaults, ignores B34 type 12 messages, and accepts (where applicable)

Short Line/Long Line conﬁguration type 5 messages

•

ﬂexible B34 ﬁrmware with country-speciﬁc defaults, which is ﬁrmware

that is coded with country-speciﬁc defaults, accepts (where applicable)

Short Line/Long Line conﬁguration type 5 messages, and accepts B34

type 12 messages which override any accepted Short Line/Long Line

conﬁguration type 5 messages

•

ﬂexible B34 ﬁrmware with universal defaults, which is ﬁrmware that is

coded with a universal B34 loss value default, may or may not ignore

Short Line/Long Line conﬁguration type 5 messages, and accepts B34

type 12 messages which override any accepted Short Line/Long Line

conﬁguration type 5 messages

To obtain the full functionality of B34 Dynamic Loss Switching, only the two

ﬂexible vintages of ﬁrmware can be used.

Every time a new connection is established, the following process is followed

to determine if and how to adjust the loss involved in the connection:

•

the port type of the originator and terminator is determined, based on

the conﬁgurations of the originator and terminator, respectively

•

this port type is used as a row index (originator) and column index

(terminator) into a connection matrix, to determine the following:

— whether to switch the pad in or out for the originator receive direction

whether to switch the pad in or out for the originator transmit direction

— whether to switch the pad in or out for the terminator receive direction

— whether to switch the pad in or out for the terminator transmit

direction

•

a message conveying this information is then sent to the originator and

terminator, if they are affected port types.

The B34 Dynamic Loss Switching feature, conﬁgured on a system basis,

introduces ﬂexibility in the loss values to be switched. Where previously

the loss values were hardcoded on the analog trunk cards, they are

now software-conﬁgurable on a per-system basis. The loss switching is

still controlled by a connection matrix deﬁned for speciﬁc markets. This

matrix cannot be changed. The loss levels to be used are conﬁgured in a

base-level table and alternative-level table in LD 97. The base level table is

the same as the one implemented and used by the B34 Static Loss Plan

Downloading feature; the alternative level table is a parallel table conﬁgured

for the B34 Dynamic Loss Switching feature.

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

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