PMC-Sierra PM5349 manual Transport and Path Overhead Bytes, Transport Overhead Bytes

Models: PM5349

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PMC-Sierra, Inc.

S/UNI-QUAD

DATASHEET

PM5349 S/UNI-QUAD

PMC-971239

ISSUE 6

SATURN USER NETWORK INTERFACE (155-QUAD)

 

 

 

13.1.2Transport and Path Overhead Bytes

Under normal operating conditions, the S/UNI-QUAD processes a subset of the complete transport overhead present in an STS-3c (STM-1) stream. The byte positions processed by the S/UNI-QUAD are indicated in Figure 11.

Figure 11: STS-3c (STM-1) Overhead

A 1

A 1

A 1

A 2

A 2

A 2

J 0

Z 0

Z 0

 

B 1

 

 

 

 

 

 

 

 

B 3

 

 

 

 

 

 

 

 

 

C 2

H 1

H 1

H 1

H 2

H 2

H 2

H 3

H 3

H 3

G 1

B 2

B 2

B 2

K 1

 

 

K 2

 

 

 

 

 

 

 

 

 

 

 

 

H 4

S 1

M 1

 

 

T R A N S P O R T O V E R H E A D

P A T H O V E R H E AD

 

S O H

P O H

Transport Overhead Bytes

A1, A2: The frame alignment bytes (A1, A2) locate the SONET/SDH frame in the STS-3c (STM-1) serial stream.

Z0:The Z0 bytes are currently defined as the STS-3c (STM-1) section growth bytes for SONET/SDH. Z0 bytes are not scrambled by the frame synchronous scrambler.

B1:The section bit interleaved parity byte provides a section error monitoring function.

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

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Page 208
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PMC-Sierra PM5349 manual Transport and Path Overhead Bytes, Transport Overhead Bytes