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S/UNI-QUAD
PMC-Sierra, Inc.
PM5349 S/UNI-QUAD
DATASHEET
PMC-971239 ISSUE 6 SATURN USER NETWORK INTERFACE (155-QUAD)
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
48
10.8.3
Framing 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.
10.8.4
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 x
7
+ x
6
+ 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).
10.9.1
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.
10.9.2
Line 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.
10.9.3
Line 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.