Rohde & Schwarz CMU-K20, Руководство по эксплуатации

Страница: 49 / 646

CMU-K20/-K21/-K22/-K23/-K24 Signalling Mode
1115.6088.12 2.15 E-10
Additional Information... Alternative Settings
and Measurements
... on Step 1
"
BS Signal
The CMU is able to generate two different RF carrier signals
(traffic channel and BCCH control channel) which can be
configured separately. This allows a complete simulation of
what happens in a real GSM network.
'
chapter 4, p. 4.161 ff.
The control and traffic channels
are configured in the
BS Signal
tab of the Connection Control
menu. To access this card press
the associated hotkey.
#
Network Identity, RF
The network is identified by the three code numbers MCC
(mobile country code), MNC (mobile network code) and NCC
(national color code). These codes are transmitted to the
mobile station on the control channel. The CMU uses the de-
fault settings shown in the diagram on the left side.
Input/output connectors suitable for the type of measure-
ments and signal levels must be chosen – see section
RF
connection on page 2.3 . An external input/output attenuation
value can be specified in order to compensate for known at-
tenuations of the input/output signal like those caused by ca-
bles.
'
chapter 4, p. 4.169 ff.
The network identity and other
parameters characterizing the
network are configured in the
Network tab of the Connection
Control menu. To access this
card press the associated hotkey
(see below).
Input/output connectors and ex-
ternal attenuations are configured
in the
RF / tab.
#
GPRS signalling
With option CMU-K42 the CMU is also able to set up a TBF
connection to a GPRS mobile phone and perform transmitter
and receiver tests in a GPRS test mode.
'
chapter 4, p. 4.187 ff.
... on Step 2
%
SIM card, test SIM
Two types of SIM card are specified for use in the GSM sys-
tem, one the size of a credit card and the considerably
smaller plug-in SIM of about 15 x 20 mm. One SIM card must
be inserted in the mobile phone in order to set up a call.
However, it is also possible to make an emergency call with-
out any card by entering 112.
Most mobile phones require a so-
called test SIM card in order to
test the sensitivity (bit error rate
and related quantities) in a test
mode. A test SIM card is avail-
able from Rohde & Schwarz with
the designation CRT-Z2 (id. no.
1039.9005.02). It features credit
card size and can be easily con-
verted to "plug-in" format.
&
Pin number
Use care when entering the PIN number as only three false
tries are allowed before the card is automatically blocked. It
can be unblocked by entering the PUK number which is ei-
ther known or can be obtained from the company that issued
the card. See also the appropriate section in the operating
manual of your mobile phone.
深圳德标仪器
135-1095-0799