Wavetek ANT-20, Руководство по эксплуатации

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ANT-20/ANT-20E Broadband Analyzer/Generator
Technical Background TB-13
2.5 “Called” mode
Fig. TB-9 Configuration diagram (VI “ATM Test Control”)
Features
•
The “called” instrument is ready to receive calls during the measurement interval. Calls
occurring outside the measurement interval will not be accepted.
•
The contents of the log file are deleted (“ATM Test Results” VI) when the measurement
starts.
•
When a connection is accepted, the QoS parameter are measured for the duration of the
connection. When a new connection is accepted, the previous measured values will be
reset, i.e. the parameters are determined afresh for each connection. I you want to save the
data from previous measurements, activate the “Log QoS Parameters” option (“ATM Test
Results VI).
The NCS value is not reset. NCS results are always determined over the entire
measurement period.
•
If a connection is accepted, the type of source model and the source parameters for the
measurement are determined from the information in the setup message. The source is
initialized so that the traffic contract is loaded as fully as possible.
Test traffic generation starts immediately after the connection is switched (assuming traffic
generation is enabled).
•
NCS (Not Connected Seconds) results are registered during intervals when no connection
exists (Disconnected State).
•
If the “Log QOS Parameters” option (“ATM Test Results” VI) is activated, the QoS results are
written to the log file after each clearing down of a connection.
•
Channel-specific errors can be inserted all the time that the virtual channel is set up.
Called instrument (Reference point)
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