PM7323 datasheet(60/219 Pages) PMC

60 / 219 page

STANDARD PRODUCT

PM7323 RCMP-200

DATASHEET

PMC-960543

ISSUE 2

ROUTING CONTROL, MONITORING, & POLICING

200 MBPS

Proprietary and Confidential to PMC-Sierra, Inc.

and for its Customer’s Internal Use.

In general, if a GCRA fails, its TAT parameter is not updated. However, a

coupling can be introduced between the update actions of GCRA1 and GCRA2.

To allow for this contingency, the COCUP (COnditional Conformance UPdate) bit

of the VC table can be set appropriately. If COCUP = 0, the update of GCRA1

and GCRA2 TAT parameters are completely independent. That is, the

conformance or non-conformance of one GCRA has no effect on the other. If

COCUP = 1, however, the GCRA1 TAT parameter update is dependent on the

conformance to GCRA2. Thus, if a cell is compliant to GCRA1, the TAT

parameter for GCRA1 shall be updated if and only if the cell is also compliant to

GCRA2.

In addition, if COCUP=1, the GCRA2 TAT parameter update is dependent on the

conformance to GCRA1. That is, if a cell is to be discarded as a result of non-

conformance to GCRA1, the GCRA2 TAT parameter will not be updated.

Two non-compliant cell counts are maintained based upon one of the following

programmable definitions, as determined by the state of the NCOMP[1:0] register

bits in the VBR/CBR Cell Rate Policing Configuration register:

1. Non-compliant CLP=0 cells and non-compliant CLP=1 cells.

2. Dropped CLP=0 cells and dropped CLP=1 cells.

3. Cells which are non-compliant with GCRA#1, and cells compliant with

GCRA#1 which are non-compliant with GCRA#2.

4. Cells which are non-compliant with GCRA#1, and cells which are non-

compliant with GCRA#2

AAL5 Packet Tagging and Dropping

An AAL5 packet can be up to 1366 cells long. If a cell is dropped early in a

packet due to policing or congestion, then the remaining cells of the packet

represent wasted bandwidth. Optionally, all remaining cells of a packet can be

dropped or tagged once a single cell has been dropped or tagged.

On a per-VC basis, the RCMP-200 has a configuration bit indicating the AAL as

Type 5 and two status bits that indicate a cell within the packet has violated either

or both of the GCRAs. For each cell received on an AAL5 connection, if either of

the status flags are set, the actions dictated by the appropriate ACTION field will

be taken on the remainder of the packet. The policing parameters for that GCRA

will not be updated. If an EOM (SDU_type=1) cell is received, the cell is passed

PM7323 Datasheet(PDF) 60 Page - PMC-Sierra, Inc

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