ATM Traffic Descriptors
PCR CLP=0+1, SCR CLP=0, and MBS CLP=0
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/05B-5
Beta Draft Confidential
Table B-3 illustrates what happens to CLP=0 and CLP=1 cells in different situations if
you select this option. This example assumes you set the traffic parameters as follows:
• PCR of CLP=0+1 is 70,000 cells/sec
• SCR of CLP=0 is 40,000
• MBS of CLP=0 is 32
All values in the table represent the measured traffic rate at a given point in time.
Table B-3. PCR CLP=0+1, SCR CLP=0, and MBS CLP=0
CLP=0+1
(CPS)
SCR of
CLP=0
Stream
MBS of
CLP=0
Stream
Result
68,000 40,000 30 The switch does not drop any cells because the
stream does not exceed traffic parameters.
70,000 40,000 60 The switch drops CLP=0 cells from the aggregate
cell stream if the burst tolerance is exceeded. The
number of cells that are dropped depends on the
traffic pattern combination of sustained and burst
cells. The larger the burst, the more cells are
dropped.
70,000 50,000 30 The switch drops 10,000 CLP=0 CPS because
CLP=0 exceeds the SCR. It may drop additional
cells because the cell burst of 30 cells at PCR,
combined with the sustained traffic, may exceed
the burst tolerance.
77,000 40,000 60 The switch drops 7,000 CPS from the CLP=0+1
stream because the stream exceeds the PCR. The
number of CLP=0 and CLP=1 cells dropped
depends on the ratio of CLP=0 to CLP=1 cells in
the aggregate stream. In addition, the switch will
drop some CLP=0 cells if they exceed the burst
tolerance.
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