PMC-Sierra PM5349 Framing and Identity Insert, Scrambler, Transmit Line Overhead Processor Tlop

PMC-Sierra, Inc.

S/UNI-QUAD

DATASHEET

PM5349 S/UNI-QUAD

PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)

10.8.3Framing and Identity Insert

The Framing and Identity Insert Block inserts the framing bytes (A1, A2) into the STS-3c (STM-1) frame. Framing bit errors may be continuously inserted under register control for diagnostic purposes.

10.8.4Scrambler

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.

10.9 Transmit Line Overhead Processor (TLOP)

The Transmit Line Overhead Processor (TLOP) provides line level alarm signal insertion, and line BIP-24 insertion (B2).

10.9.1APS 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.

10.9.2Line BIP Calculate

The Line BIP Calculate Block calculates the line BIP-24 error detection code (B2) based on the line overhead and synchronous payload envelope of the transmit stream. The line BIP-24 code is a bit interleaved parity calculation using even parity. Details are provided in the references. The calculated BIP-24 code is inserted into the B2 byte positions of the following frame. BIP-24 errors may be continuously inserted under register control for diagnostic purposes.

10.9.3Line RDI Insert

The Line RDI Insert Block controls the insertion of line remote defect indication. Line RDI insertion is enabled using the TLRDI input, or register control. Line RDI is inserted by transmitting the code 110 (binary) in bit positions 6, 7, and 8 of the K2 byte contained in the transmit stream.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use 48