PM5347S Datasheet, PDF(75/302 Page) PMC-Sierra, Inc – SATURN USER NETWORK INTERFACE PLUS

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PM5347S Datasheet, PDF (75/302 Pages) PMC-Sierra, Inc – SATURN USER NETWORK INTERFACE PLUS

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PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

The BIP-8 calculation is based on the scrambled data of the complete STS-3c/1

(STM-1) frame. The section BIP-8 code is based on a bit interleaved parity

calculation using even parity. Details are provided in the references. The

calculated BIP-8 code is then inserted into the B1 byte of the following frame

before scrambling. BIP-8 errors may be continuously inserted under register

control for diagnostic purposes.

Framing and Identity Insert

The Framing and Identity Insert Block inserts the framing bytes (A1, A2) and

trace/growth bytes (J0/Z0) into the STS-3c/1 (STM-1) frame. Framing bit errors

may be continuously inserted under register control for diagnostic purposes.

Scrambler

The Scrambler Block utilizes a frame synchronous scrambler to process the

transmit stream when enabled through an internal register accessed via the

microprocessor interface. The generating polynomial is x7 + x6 + 1. Precise

details of the scrambling operation are provided in the references. Note that the

framing bytes and the identity bytes are not scrambled. All zeros may be

continuously inserted (after scrambling) under register control for diagnostic

purposes.

9.12 Transmit Line Overhead Processor

The Transmit Line Overhead Processor (TLOP) provides line level alarm signal

insertion, and line BIP-24/8 insertion (B2).

APS Insert

The APS Insert Block inserts the two automatic protection switch (APS) channel

bytes in the Line Overhead (K1 and K2) into the transmit stream when enabled

by an internal register.

Line BIP Calculate

The Line BIP Calculate Block calculates the line BIP-24/8 error detection code

(B2) based on the line overhead and synchronous payload envelope of the

transmit stream. The line BIP-24/8 code is a bit interleaved parity calculation

using even parity. Details are provided in the references. The calculated

BIP-24/8 code is inserted into the B2 byte positions of the following frame.

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERSâ INTERNAL USE 59

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