PMC-Sierra PM5349 manual Operation, ATM Mapping into the STS-3c STM-1 SPE

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 OPERATION

13.1SONET/SDH Frame Mappings and Overhead Byte Usage

13.1.1 ATM Mapping

The S/UNI-QUAD processes the ATM cell mapping for STS-3c (STM-1) as shown below in Figure 10. The S/UNI-QUAD processes the transport and path overhead required to support ATM UNIs and NNIs. In addition, the S/UNI-QUAD provides support for the APS bytes. In Figure 10, the STS-3c (STM-1) mapping is shown. In this mapping, no stuff columns are included in the SPE. The entire SPE is used for ATM cells.

Figure 10: ATM Mapping into the STS-3c (STM-1) SPE

 

270

bytes

 

9

 

261

bytes

bytes

 

 

 

Sectio n

 

 

 

O verh ead

 

ATM Cell

 

(Reg en .

B3

 

 

Sectio n)

 

 

 

 

 

Pointer

C2

 

 

 

 

9

 

G 1

 

 

ATM Cell

bytes

Line

 

 

 

 

O verh ead

H4

 

 

(M u ltiplex

ATM Cell

 

 

Sectio n)

 

 

 

 

 

 

 

 

ATM Cell

STS -3c Transport O v erhead

 

 

STM -1 Section O v erhead

 

 

A1

A1

A1

A2

A2

A2

J0

Z0

Z0

 

 

 

 

 

 

 

 

 

B1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H1

H1

H1

H2

H2

H2

H3

H3

H3

 

 

 

 

 

 

 

 

 

B2

B2

B2

K1

 

 

K2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S1

 

 

 

 

M 1

E2

 

 

 

 

 

 

 

 

 

 

 

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

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Page 207
Image 207
PMC-Sierra PM5349 manual Operation, ATM Mapping into the STS-3c STM-1 SPE