Rohde & Schwarz 1094.0006.50, Руководство по эксплуатации

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CTS55 Description of the Menus
1094.0006.55 9.25 E-7
9.7.8 Bit Error Rate Menu
In this menu the bit error of the mobile is calculated and displayed. To perform this measurement a
special SIM CARD (i.e. R&S GSM test SIM CRT-Z2) is required which allows the RF loop back at the
mobile station.
In the RF loop back mode, bits sent by the CTS and received by the mobile station are demodulated
and then modulated again by the mobile station and finally sent back to the CTS on the RF path. The
CTS compares the transmitted bits with the received bits and calculates the bit error rate of the mobile
station.
The following values are indicated at the display:
RxLev and RxQual
During an established connection the mobile station measures the level (RxLev) and the quality
(RxQual) of the signal received by the mobile. Both values are reported back to the CTS and are
displayed in this screen.
RBER II, RBER IB and FER
These contain the bit error measurement results, which are updated continuously.
On the bottom part of the screen the number of the averaged frames from the beginning of the
measurement are displayed as number value and as a bar.
Stop
With this key the measurement can be stopped and started again.
Rf Chan
By pressing this key the traffic channel number can be changed.
Tune BS-Sig
By pressing this key the level transmitted by the CTS can be changed.
Number of Frames
By pressing this key the number of frames to average can be changed.