B-61/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
ATM Traffic Descriptors
PCR CLP=0+1, SCR CLP=0, and MBS CLP=0 With Tagging
Beta Draft Confidential
PCR CLP=0+1, SCR CLP=0, and MBS CLP=0 With
Tagging
You can select this option only for VBR traffic. Traffic conformance is based on the
PCR of the CLP=0+1 aggregate cell stream, as well as the SCR and MBS of the
CLP=0 cell stream with Tagging enabled. The cell streams are checked for traffic
conformance as follows:
• The switch checks the cell rate of the CLP=0+1 stream; the switch drops cells
arriving above the PCR of CLP=0+1. The number of CLP=0 and CLP=1 cells
dropped is based approximately on the ratio of CLP=0 to CLP=1 cells.
For example, if the ratio of CLP=0 to CLP=1 cells is 8 to 5, approximately 8
CLP=0 cells are dropped for every 5 CLP=1 cells that are dropped.
• The switch checks the SCR and the MBS of the CLP=0 stream. If the stream
exceeds SCR, cells arriving above the SCR are admitted until the stream exceeds
tolerance for such cells. Tolerance is based on the MBS, PCR, and CDVT. The
switch tags cells that arrive above the SCR once the stream exceeds this tolerance
level.
Table B-4 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 CPS
• SCR of CLP=0 is 40,000
• MBS of CLP=0 is 32
Note – For more information about these traffic conformance parameters, see the
ATM UNI Specification, Version 3.1 or Bellcore’s GR-1110-CORE Specification.
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