Appendix D ATM Traffic Descriptors
Traffic Descriptors Supported
D-2
255-700-025
PacketStar
™
Access Concentrator 60 User Guide
, Issue 1
Release 6.3.0
•
One bucket, with no tagging for cells with both CLP bit=0 and CLP bit=1
(1B-NT-0+1)
This traffic descriptor uses the parameters one bucket, no tagging, cell loss
priority (CLP)=0+1 cells (high and low priority). The Access
Concentrator ignores the CLP bit value and drops all cells violating the
value set for the peak cell rate (PCR).
•
Two buckets, with no tagging for cells with both CLP bit=0 and CLP bit=1
(2B-NT-0+1-0+1)
This traffic descriptor uses the parameters two buckets, no tagging,
CLP=0+1 cells (high and low priority) for bucket 1, and CLP=0+1 cells
(high and low priority) for bucket 2. The Access Concentrator ignores the
CLP bit value for cells passing into bucket 1 and drops all cells violating
the value set for the PCR. The remainder of the cells are passed to bucket
2. The Access Concentrator ignores the CLP bit value for cells passing
into bucket 2, and drops all cells violating the value set for the sustainable
cell rate (SCR).
•
Two buckets, with no tagging for cells with both CLP bit=0+1 and CLP
bit=0 (2B-NT-0+1-0)
This traffic descriptor uses the parameters two buckets, no tagging,
CLP=0+1 cells (high and low priority) for bucket 1, and CLP=0 cells (high
priority) for bucket 2. For bucket 1, the Access Concentrator ignores the
CLP bit value for cells passing into bucket 1 and drops all cells violating
the value set for the PCR. For bucket 2, the system takes one of the
following actions:
~
When the connection is configured for variable bit rate (VBR) traffic,
the Access Concentrator drops all CLP=0 cells violating the value set
for the SCR in bucket 2.
~
When the connection is configured for constant bit rate (CBR) traffic,
the Access Concentrator drops all CLP=0 cells violating the value set
for the PCR in bucket 2.
•
Two buckets, for cells with CLP bit=0 and CLP bit=0 (2B-NT-0+1-0)
This traffic descriptor uses the parameters two buckets, tagging, CLP=0+1
cells (high and low priority) for bucket 1, and CLP=0 cells (high priority)
for bucket 2. For bucket 1, the Access Concentrator ignores the CLP bit
value for cells passing into bucket 1 and drops all cells violating the value
set for the PCR. For bucket 2, the system takes one of the following
actions:
~
When the connection is configured for variable bit rate (VBR) traffic,
the Access Concentrator tags all CLP=0 cells violating the value set for
the SCR to CLP=1 in bucket 2.
~
When the connection is configured for constant bit rate (CBR) traffic,
the Access Concentrator tags all CLP=0 cells violating the value set for
the PCR to CLP=1 in bucket 2.
The network then might drop some or all cells during congestion.