Wavetek ANT-20, Руководство по эксплуатации

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Broadband Analyzer/Generator ANT-20/ANT-20E
S-8 Specifications “ATM Layer”
2.3 ATM Layer Quality of Service Measurements
2.3.1 General Features
2.3.2 Error Related Parameters
Measurement algorithm conforms to ITU-T recommendation O.191, issue of 9th January 1997.
The following parameters are measured as count and rate (or ratio) values.
•
Cell loss
•
Cell error
•
Cell misinsertion
•
Severely errored cell block, SECB
The “Analyzed Cell Count” is also indicated.
2.3.3 Delay Related Parameters
Delay measurements are only possible if the generator cell stream is looped back to the
receiver, i.e. when the instrument receives its own cell stream again.
Number of measurement channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum measurement channel bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . .366792 cells/s
1
Maximum total bandwidth of all test channels . . . . . . . . . . . . . . . . . . . . . . . . . . .366792 cells/s
1
1 In practice, the upper limit is given by the physical mapping.
Minimum cell transfer delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . min. CTD
Maximum cell transfer delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. CTD
Mean cell transfer delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . mean CTD
2-point cell delay variation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-pt. CDV
PP