Description
A number of measurements can be initiated (with the INITiate command) while other measurements are being made, and the test set will perform as many operations simultaneously as its architecture allows. This technique is referred to as concurrency. Performing measurements concurrently can greatly improve test throughput.
Operating Considerations
The test set has three parallel signal paths to improve measurement throughput.
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Demodulation downconverter path.
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Measurement downconverter path.
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Power detector path.
Since measurements are DSP (digital signal processor) based, and there are four A/D converters available to digitize or "sample" the input signal for analysis by the DSP, the test set will always have the capability to perform one transmitter measurement, one receiver measurement, and maintain the radio link concurrently. The test set's ability to perform multiple transmitter, or multiple receiver tests concurrently will depend on the availability of resources within the test set and availability of the signal to be tested.
Table Key
Empty cell: These measurements can operate concurrently with no conflicts.
A: Cannot operate concurrently. The measurement which is initiated most recently will cause all other conflicting measurements to be closed.
B: These measurements share a sampler path. If multiple measurements are initiated at the same time, they will execute sequentially. However, if multiple measurements are configured to operate off the same trigger event and only a single occurrence of that event happens, only the first initiated measurement will complete .
C: The traffic channel ARFCN or transmit power level can be changed while the measurement is in progress. However, this causes the measurement to re-start, obviously increasing test time.
D: When this measurement is initiated, all other measurements are closed.
E: The Block Error Rate (BLER) measurement cannot operate concurrently with the GPRS Bit Error Rate (GBER) measurement or the SRB Loopback BER measurement.
This note is applicable to GSM only.
The downlink speech source cannot be used when the FBER or BER measurements are running. These measurements take absolute control of the downlink speech source and use it to generate the pseudo-random data.
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