PM7323 datasheet(61/219 Pages) PMC

61 / 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.

on and the status bits are cleared. Note: If AAL5 packet policing is to be

used, only one GCRA may police the cell stream. The other GCRA must

have its increment field set to 0x00000.

OAM and Resource Management (RM) cells are passed transparently by the

packet discard mechanism.

The CLP=0, CLP=1 and non-compliant cell counts are updated for all cells of an

AAL5 packet.

9.3.5 Cell Counting

The RCMP-200 maintains counts on a per VC basis and over the aggregate cell

stream.

The following parameters are stored on a per VC basis:

• number of low priority cells

• number of high priority cells

• non-compliant cell counts (user programmable)

The number of cells discarded by the policing function and the number of cell

reduced from high to low priority can be derived from the above counts , the

state of the Action1[1:0] and Action2[1:0] fields, and the state of the NCOMP[1:0]

In order to maintain accurate non-compliant cell counts in the VC table, the

RCMP-200 asserts a maskable interrupt whenever the most significant bit is set

for either of the non-compliant cell counts. This allows an external

microprocessor to read the counts to prevent saturation.

The low and high priority cell counts represent the state of the cells before

policing. The non-compliant cell counts can be used to derive the cell counts

after policing.

To provide the ability to provision scheduled measurements and special studies,

each VC can be programmed to count either user information cells, OAM

(including Resource Management) cells or both.

PM7323 Datasheet(PDF) 61 Page - PMC-Sierra, Inc