PM5347 datasheet(85/302 Pages) PMC

85 / 302 page

PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Persistency:

The Persistency process checks for the repeated reception of the same C2

byte. An unstable counter is incremented for each received C2 byte that

differs from the byte received in the previous frame. For example, a single

corrupted byte value in a sequence of constant values causes the unstable

count to increment twice, once on receipt of the corrupted value, and again

on the next (uncorrupted) value. A path signal label unstable alarm or a

synchronization status unstable alarm is declared when either unstable

counter reaches five.

The unstable counter is reset to zero, the unstable alarm is removed, and the

byte value is accepted when the same label is received in five consecutive

frames. The accepted value is passed to the Compare process for

comparison with the expected value.

Compare:

A path signal label mismatch alarm or a synchronization status mismatch

alarm is declared if the accepted C2 byte (i.e. the byte value that has passed

the persistency check) does not match the expected C2 byte (previously

downloaded by the microprocessor).

The OBR mismatch mechanism follows the following table:

PM5347 Datasheet(PDF) 85 Page - PMC-Sierra, Inc