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ATM Operation
Measuring ATM Delay Performance
ATM delay measurements
Each cell transmitted may experience a different delay through the ATM network.
The delay calculated for each cell can be analyzed over a period of time to produce
delay measurements. The following ATM cell delay measurements have been
standardized by the ATM Forum and also in ITU-T Recommendation O.191.
• Mean cell transfer delay: the average of the delays calculated for each cell over
the measurement time.
• Maximum cell transfer delay: the maximum value of delay calculated over the
measurement time.
• Peak to peak two point CDV: the difference between the maximum delay and the
minimum delay calculated over the measurement time.
These measurements are made using the timestamp field within the O.191 test cell.
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Cell Delay
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