Atm Performance Measurements; User Channel Analysis And Load Measurement - Wavetek ANT-20 Operating Manual

ANT-20/ANT-20E
2.4.2.5

ATM performance measurements

Error-related performance parameters
The measurements are made using test cells.
Results
Lost Cell Count, Cell Loss Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CLR
Misinserted Cell Count, Cell Misinserted Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CMR
Error Cell Count, Cell Error Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CER
Cell transfer delay
The measurement is made using test cells.
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . rate distribution
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 ns to 0.355 s
Measurement range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 µs to 42.9 s
Measurement range offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 0.167 s
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .µs
Cells with transfer delays outside the measurement range are counted as class 0 (underflow) or
class 127 (overflow).
Cell delay variation
The measurement is made using test cells.
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . rate distribution,
The results are only valid if no cell delays outside the measurement range are detected.
2.4.3

User channel analysis and load measurement

Cell filters (VCI, VPI, CLP) for extracting the test channel.
The VCI and CLP filters can be disabled
Mean cell rate
The measurement is made over all connections in parallel and in the test channel
simultaneously.
Measurement interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 s
Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.01%
Load display
Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Mbit/s, Cells/s, %
Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . linear, logarithmic
Specifications OC-12c/STM-4c
Concatenation Options
minimum delay,
maximum delay,
average delay,
peak-to-peak-CDV
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