109
Making Measurements
Measuring ATM Non-Conforming cells and one-point Cell Delay
Variation.
Measuring ATM Non-Conforming cells and
one-point Cell Delay Variation.
Description ATM policing is performed using the Generic Cell Rate Algorithm
(GCRA). The HP 37717C can perform a single GCRA policing test using
the Peak Cell Rate and CDV tolerance parameters. Any cell received that
does not conform to the GCRA test is measured as a non-conforming cell.
If no non-conforming cells are measured, the Maximum 1-point Cell
delay Variation (CDV) measurement tells you what margin of error there
is. When the 1-point CDV equals the CDV tolerance, a non-conforming
cell is measured. If you select CDV Tolerance DISABLED, no non-
conforming cells are recorded and the maximum 1-point CDV result is
the minimum value of CDV Tolerance required to ensure cell
conformance.
HOW TO: 1 Configure the receiver for ATM measurements. See "Selecting the
ATM Measurement Parameters " page 104.
2 Select the PEAK CELL RATE and CDV TOLERANCE for the test.
TIP:
If you are unsure of the PEAK CELL RATE to choose, run a short test
first The MEASURED AVG. CELL RATE shows the average cell rate
during the test. This is the minimum suitable value for the PEAK CELL
RATE. If you select AVERAGE as the PEAK CELL RATE, the measured
average value is automatically entered. The test must be stopped before
the AVERAGE can be entered.
3 Press to start a test.
4 You can view the NON-CONFORMING CELL COUNT and MAX 1-PT
CDV results on the or
display. MAX 1-PT CDV is only available as a
CUMULATIVE result.
RUN/STOP
RESULTS
ATM CUMULATIVE
SHORT TERM
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