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PM7324

SATURN USER NETWORK INTERFACE ATM LAYER SOLUTION

PMC-Sierra 

S/UNI-ATLAS

DATASHEET

PMC-1971154

ISSUE 7

PM7324 S/UNI-ATLAS

S/UNI-ATM LAYER SOLUTION

• Egress functionality includes programmable direct lookup function, OAM-PM termination,

generation and monitoring, per-connection CLP0 and CLP1 cell counts (programmable) and

OAM-FM termination, generation and alarm generation (monitoring). An egress per-PHY

output buffering scheme resolves the head-of-line blocking issue.

• UPC/NPC function is a programmable dual leaky bucket policing device with a programmable

action (tag, discard, or count only) for each bucket. A total of 3 programmable 16 bit non-

compliant cell counts are provided. The non-compliant cell counts may be programmed to

count, for example, dropped CLP0 cells, dropped CLP1 cells, and tagged CLP0 cells. The

UPC/NPC function also has a continuously violating mode, where a programmable action is

taken on all cells regardless of their compliance. AAL5 partial packet discard is also provided

so that the remainder of an AAL5 packet can be tagged or discarded if a single cell in the

packet is tagged or discarded as a result of violating policing.

• In addition to the per-connection dual leaky bucket, a single leaky bucket UPC/NPC function is

provided on a per-PHY basis. A programmable action (tag, discard or count only) may be

configured for each PHY policing device. Three programmable non-compliant cell counts are

provided for each PHY. The non-compliant cell counts may be programmed to count, for

example, dropped CLP0 cells, dropped CLP1 cells and tagged CLP0 cells. The per-PHY

policing parameters and non-compliant cell counts are maintained in an on-chip RAM that can

be programmed and read via the 16-bit general purpose microprocessor interface.

• Guaranteed Frame Rate frame-based policing selectable on a per-connection basis.

• OAM-Performance monitoring is provided in the ingress and egress direction for bi-directional

PM sessions. A maximum of 512 (256 bi-directional sessions) PM sessions may be

simultaneously active. PM is supported on the F4 and F5 levels. The S/UNI-ATLAS provides

for the generation of Forward Monitoring and Backward Reporting PM cells (both segment

and end-to-end), the termination of Forward Monitoring and Backward Reporting cells, and for

non-intrusive monitoring of Forward Monitoring and Backward Reporting cells. The following

statistics are collected when terminating or monitoring PM flows:

1. Forward Impaired Block.

2. Forward Lost/Misinserted Impaired Block

3. Forward Severely Errored Cell Block (Lost).

4. Forward Severely Errored Cell Block (Misinserted).

5. Forward Severely Errored Cell Block (BIP-16 violations).

6. Forward Severely Errored Cell Block Combined (non-saturating)

7. Forward Lost CLP0+1 cell count.

8. Forward Lost CLP0 cell count.

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC AND FOR ITS CUSTOMERS’ INTERNAL USE 2

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