Rohde & Schwarz 1094.0006.50, Руководство по эксплуатации

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Getting Started With Autotest CTS55
1094.0006.55 3.2 E-7
When a two band autotest sequence is performed, two further autotest steps may be attempted. These
two steps are determined by examining the Dual Band capability of the instrument. If the instrument is
configured for Dual Band handover, then the following two steps apply.
The „Handover To“ step is only performed in the starting network, where the location update occurs and
the „Handover From“ step is only performed after testing has been completed in the handover band.
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Handover To the new band
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Handover From the new band
The Autotest can be carried out on one, two or three channels. In the introduction it is assumed that the
test will be carried out on two channels (mode on delivery). The number of channels can be changed in
the Config-Autotest menu. It is also assumed that the wide tolerances are used (see also the Config-
Autotest menu).
Within this sequence there are several channel changes, which means that channel changes are also
tested.
To become familiar with CTS in Autotest mode try out the functions described immediately using a CTS
and a mobile station. The instructions and information given in this chapter are based on the assumption
that the mobile is connected to the tester via a cable.
For further information on the individual menus and keys, refer to the detailed description of the test
sequence in chapter 4 and to the menu descriptions in chapter 9.
Details of the test set-up and the use of antenna couplers are in chapter 8.
Important notes:
•
In order to exclude unpredictable circumstances that may arise due to the use of a network SIM card
(e.g. the SIM card prohibits the registration (Location Update) on the network simulated by CTS or it
prohibits the signalling for the bit error test), it is strongly recommended that an R&S GSM test SIM
card (part CRT-Z2) is used.
•
The GSM850, GSM, PCN and PCS networks are cellular networks. The area to be covered by the
network is divided up into honeycomb-shaped cells in the ideal case. The graphics on the front panel
of the CTS indicates the network’s cellular structure.
Each cell accommodates a base station transmitting the control information on a defined channel.
The CTS is simulating the radio network, i.e. the base station, so that a control channel is
transmitted. If the CTS is in the area of a cell make sure that the control channel of the CTS differs
from that of the cell. In the case where the CTS uses the same channel as the base station of the
cell, the mobile phone may try to register with the cell or the Location Update with the CTS may be
disturbed.
With the CTS in autotest or quicktest mode the control channel corresponds to the 1st channel set in
the configuration.
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Special attention is required when using an antenna coupler (see chapter 8).