Rohde & Schwarz CMU-K20, Operating Manual

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CMU-K20/-K21/-K22/-K23/-K24 General Settings
1115.6088.12 3.5 E-10
Non Signalling
(GMSK and 8PSK-modulated signals supported) Signalling
(GMSK-modulated signals supported)
lation parameters.
Application Phase Error 8PSK:
Diagram showing the phase error within the burst as a func-
tion of time plus a statistical evaluation of 8PSK modulation
parameters.
tion parameters.
Application Phase Error 8PSK:
Diagram showing the phase error within the burst as a func-
tion of time plus a statistical evaluation of 8PSK modulation
parameters.
Spectrum
Diagram showing the amount of energy that spills outside
the designated channel. The off-channel spectrum is
caused by the modulation (spectrum due to modulation)
and to the bursty nature of the RF signal (spectrum due to
switching). Statistical results and the results of the limit
check are indicated in addition. A special mode for spec-
trum due to switching measurement on multislot configura-
tions is available.
Spectrum
Diagram showing the amount of energy that spills outside the
designated channel. The off-channel spectrum is caused by
the modulation (spectrum due to modulation) and to the bursty
nature of the RF signal (spectrum due to switching). Statistical
results and the results of the limit check are indicated in addi-
tion. A special mode for spectrum due to switching measure-
ment on multislot configurations is available.
– Receiver Quality
Table showing the results of the bit error rate test including
the limit check and the receiver parameters reported by the
mobile station. Bit error rates for different bit classes, the re-
sidual bit error rate and frame erasure rate, the raw bit error
rate, the data block error rate and the USF BLER can be as-
sessed in various measurement modes. The Block Error Rate
(BLER) can be measured on GPRS channels.
A graphical overview of the menus is given at the end of this chapter.
General Settings
A number of settings can be made in several of the configuration menus assigned to the measurement
groups
Power , Modulation, Spectrum, and Receiver Quality . In combination, these settings define the
scope of the measurement, i.e. the number of bursts measured and the results displayed. The following
brief overview is intended to avoid confusion of terms.
Application Applications are different measurements belonging to the same measurement
group. They effectively split up a measurement group into various related sub-
groups which can be configured separately.
They are selected via the Application softkey in the measurement menus.
Statistic Count /
Statistics Cycle
The statistic count is equal to the integer number of evaluation periods which
form one statistics cycle. An evaluation period corresponds to the duration of a
burst (measurement groups
Power , Modulation, and Spectrum) or a speech
frame (measurement group Receiver Quality). Depending on the repetition mode
(see below), a measurement may extend over one or several statistics cycles.
The statistic count is set in the Control tab of the configuration popup-menus
assigned to each measurement group.
Repetition Mode The repetition mode defines how many statistics cycles are measured if the
measurement is not stopped by a limit failure (see stop condition On Limit Fail-
ure below). Two modes are available for all measurements:
Single Shot The measurement is stopped after one statistics cycle
Continuous The measurement is continued until explicitly terminated by the
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