PM7326 datasheet(89/238 Pages) PMC

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PM7326 S/UNI APEX

DATA SHEET

PMC-1981224

ISSUE 6

ATM/PACKET TRAFFIC MANAGER AND SWITCH

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Table 8

- OAM & RRM Cell Identification

Type

Parameter

Location

VcVPC = 1

VC Context

VPC End to End OAM

VCI = 4

Cell header

VcVPC = 1

VC Context

VPC Segment OAM

VCI = 3

Cell header

VcVPC = 0

VC Context

VCC End to End OAM

PTI = 5

Cell header

VcVPC = 0

VC Context

VCC Segment OAM

PTI = 4

Cell header

VcVPC = 0

VC Context

RRM

PTI = 11x

Cell header

VPC/VCC End to End OAM cells will be redirected to the uP’s class 0 queue if

the context parameter VcEEOam = 1, independent of the queue method

selected. If VcEEOam = 0 and FCQ is selected, then the cell will be queued

directly onto the class queue.

VPC/VCC segment OAM cells will be redirected to the uP’s class 0 queue if the

context parameter VcSegOam = 1, independent of the queue method selected.

If VcSegOam = 0 and FCQ is selected, then the cell will be queued directly onto

the class queue.

Non user cells not meeting any of the above conditions will not be redirected and

will be treated like a normal user cell in terms of queuing.

The re-direction applied on OAM cells will preclude any performance measuring

sessions on VCs that are programmed with FCQ.

10.9.3 Class Scheduling

Class scheduling is performed on the loop and WAN ports. There is no class

scheduling for the uP ports as all four classes are accessible simultaneously.

The class scheduler provides modified priority scheduling with class zero having

the highest priority and class three having the lowest. The high priority classes

can be utilized for real time services such as CBR and VBR-rt. The lower priority

classes can be utilized for VBR-nrt, GFR and UBR services. There are three

configurations for class scheduling:

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