Agilent Technologies 8922M, S GSM manual Mobile Phone Receiver Testing Using Test Mode

NOTE

Mobile Phone

Receiver Testing

Using Test Mode

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.

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.

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 ORG CALL and END CALL 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.

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