Rohde & Schwarz CMU-K20, Operating Manual

Page: 210 / 646

Signalling: Receiver Quality Measurements
CMU-K20/K21/K22/K23/K24
1115.6088.12 4.132 E-12
Measurement Results
The measurement results depend on the application selected.
a) BER and BER Average
The test settings of the current
Receiver Quality
measurement and the results are displayed in the
tables in the center of the menu.
Fig. 4-61 Display of test settings and measurement results (BER)
The measurement results in the left upper table depend on the selected measurement mode (see
definitions at the beginning of section
Receiver Quality Measurements
on page 4.118 ).
RBER/FER
When the residual bit error rate
(Meas. Mode = RBER/FER)
is measured the
following is displayed:
Class II
Residual bit error rate for class II bits (unprotected bits)
Class Ib
Residual bit error rate for class Ib bits (partly protected bits)
FER
Frame erasure rate: relative number of invalid and therefore
erased frames
CRC Error
Result of
cyclic redundancy check.
Number of frames erased on
the signal path from the
device under test
to the CMU
Note: In some specific measurements, not all results may be available. E.g.
the AMR full rate speech codec does not provide any Class II bits; the
output field shows invalid results “– – –“.
BER
When the bit error rate
(Meas. Mode = BER)
is measured the following is
displayed:
Class II
Bit error rate for class II bits (unprotected bits)
Class Ib
Bit error rate for class Ib bits (partly protected bits)
CRC Error
Result of
cyclic redundancy check:
number of frames erased on
the signal path from the
device under test
to the CMU
深圳德标仪器
135-1095-0799