Rohde & Schwarz CMU-K20, Operating Manual

Page: 252 / 646

Signalling: Connection Control
CMU-K20/K21/K22/K23/K24
1115.6088.12 4.174 E-12
B52 Mode
B52 Mode
qualifies whether the speech codec (option CMU-B52) is reserved for
audio measurements or for the BLER measurement:
Speech Coder
The speech codec is reserved for audio measurements (see
also section
AF/RF Connectors (Connection Control – AF/RF)
on p. 4.179 ff.). The Block Error Rate (BLER) measurement (see
section
Receiver Quality Measurements
on p. 4.118 ff.) can be
performed on one timeslot only.
Multislot Support
The speech codec is used for the BLER measurement so that a
result can be obtained in up to 4 timeslots. The speech codec is
not available for audio tests, however, direct tests on audio
signals are still possible with option CMU-B41,
Audio Generator
and Analyzer
(see CMU 200/300 manual).
Switchover of the
B52 Mode
takes some seconds. This function is not available
unless option CMU-B52 is fitted.
Remote control
CONFigure:NETWork:B52Mode SCOD | MSUP
Network Identity
The field
Network Identity
contains parameters characterizing the radio network
that the CMU mimics:
MCC
3-digit Mobile Country Code, set to 001,
MNC
2-digit Mobile Network Code, set to 01, (3-digit for GSM850 and
GSM1900, set to 010)
NCC
Network Color Code, set to 0,
BCC
Base transceiver station Color Code, set to 0,
Location Area (LAI)
Location Area Code, set to 1.
RAC
Routing Area Code, set to
0
Remote control
CONFigure:NETWork:IDENtity:MCC <MCC>
CONFigure:NETWork:IDENtity:MNC <MNC>
CONFigure:NETWork:IDENtity:NCC <NCC>
CONFigure:NETWork:IDENtity:BCC <BCC>
CONFigure:NETWork:IDENtity:LAC <LAC>
CONFigure:NETWork:IDENtity:RAC <RAC>
Signalling
Modes
The
Signalling Modes
table section determines signalling parameters that the CMU
conveys to the mobile station to influence its function (the parameters for CMU
signals, on the other hand, are set in the BS-Signal tab, see section
RF Signals of
the CMU (Connection Control – BS Signal)
on p. 4.161 ff.). The parameters refer
to:
•
Traffic Mode
and
Bit Stream;
see section
Softkey-oriented Version
on p. 4.169
ff.
•
Definition of a
Starting Time
for the channel change and the handover
.
•
Location Update
•
Input of a mobile subscriber identity used for the location update
(Default IMSI)
•
Power Change
mode
•
Signalling Channel
•
Condition for closing the loop in the mobile station
(Loop Command)
Starting Time Starting Time
determines a time interval after which the mobile station performs a
new registration to the network after a channel, timeslot and fast power change
(see
Power Change
). The value 0 frames means that no starting time is used.
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