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2-11
Making Measurements
TEST MODE
Code is not known, it can be determined and corrected from measurements
described later. Refer to the “Advanced Features” section mentioned later in this
chapter.
NOTE In the Active Cell mode, the Colour Code is automatically set.
Once these have been selected, the Agilent 8922M/S is ready to measure incoming
signals of the type specified. The mobile phone should be set up to generate a
corresponding test signal to the one expected. This will require access to the mobile
phone manufacturer’s servicing or test modes.
Mobile Phone
Receiver Testing
Using Test Mode
It is possible to analyze the mobile phone’s response to the Agilent 8922M/S
Broadcast Channel (BCH), by varying the BCH number and amplitude, (4),
see Figure 2-3 on page 2-10. TEST MODE provides the Agilent 8922M/S with a
“forced” traffic channel (TCH) generator which can be turned on and off without the
need for any signaling or the presence of a mobile phone. A forced TCH can be
generated on any channel in the GSM Base Station range and is enabled by the On/
Off toggle field (1) below the Traffic Chan or the and
keys.
The presence of both the BCH and forced TCH signals from the Agilent 8922M/S
allows the mobile phone’s receiver to be stimulated with signals identical to those
used on a real call. These signals can be used in conjunction with the mobile phone
manufacturer’s service and test modes to help measure and troubleshoot the mobile
phone. With these features, it is possible to make bit error rate measurements and
test the mobile phone’s receiver sensitivity when there is no call set up.
ORG CALL END CALL