PM7324 S/UNI-ATLAS
S/UNI-ATLAS
DATASHEET
PMC-1971154
ISSUE 7
S/UNI-ATM LAYER SOLUTION
1.1
Policing
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Policing is performed in the ingress direction for adherence to peak cell rate (PCR), cell delay
variation tolerance (CDVT), sustained cell rate (SCR) and burst tolerance (BT). Violating cells
can be noted, dropped or tagged.
Policing is performed using the virtual scheduling Generic Cell Rate Algorithm (GCRA)
described in ITU-T I.371.
Two policing instantiations available per VC. The policed cell streams can be any combination
of user cells, OAM cells, Resource Management, high priority cells or low priority cells.
Per-PHY policing may also be enabled. Each of 32 PHY devices may have a single leaky
bucket enabled, in addition to the dual leaky bucket of the connection. Violating cells can be
noted (counted only), dropped or tagged.
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1.2
Cell Counting
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Counts maintained on a per-VC basis include total low priority cells, total high priority cells
and cells violating the traffic contract. Per-VC counts are maintained for both the ingress and
egress directions.
Counts maintained on a per-PHY basis (in both the Ingress and Egress directions) include:
number of CLP0 cells received, number of CLP1 cells received, number of OAM cells
received, number of RM cells received, number of errored OAM cells, number of errored RM
cells, number of cells with unassigned/invalid VPI/VCI/PTI and the number of cells received
with a non-zero GFC (ingress UNI only).
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PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC AND FOR ITS CUSTOMERS’ INTERNAL USE
5
PMC [ PMC-SIERRA, INC ]
