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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.
49
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