2201R Mobile Tester User Guide
Chapter 3 Performing manual tests and measurements in GSM mode
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Testing multiband phones
A typical mobile phone today supports three or four GSM frequency bands: GSM 900, GSM 1800, GSM 850 and
GSM 1900. GSM 900 and GSM 850 can be selected by simply entering a channel number that falls into these bands
because their channel numbers are associated with the band. See Table 7 on page 42 for a list of bands and
frequencies.
GSM 1800 and GSM 1900, however, use the same channel numbers in different bands. Therefore, you should select
one of these “upper bands” before starting a test. This is done in the GSM/GPRS Parameters menu as explained in
’Defining the upper frequency band’ on page44.
You can change the frequency band during the call, without the need to release the call and set up a new one,
provided that you do not change the upper frequency band.
Example
: If you have a phone supporting four bands and you want to test it in all four bands, you can, for example,
select the BCCH in one of the upper bands (say, GSM 1800) and choose a TCH number in that same band, and set up
a call to perform measurements in the upper band. In the next step, you may change the TCH to a channel in the
GSM 900 band (without releasing the call), perform measurements there, and then change the TCH again to a
channel in the GSM 850 for measurements in that band. Finally you release the call, change the upper band (to
GSM 1900 in this case), set the BCCH and TCH to channel numbers from that band and set up a call for your
measurements in this fourth band.
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