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<div class="div">
<h1>Tri-Band</h1>

<p>This feature supports the use of the ETSI-specified GSM900
frequency band extension. According to the ETSI GSM 05.01 specification, in
some countries it may be possible to allocate an extra frequency band for
the GSM900 from the area of 880-890 MHz uplink and 925-935 MHz downlink (10
MHz below the currently used 25 MHz sub-bands).</p>


<p>In case the whole extension band could be utilised, the
number of frequencies available would increase from 124 to 174. The E-GSM900
(the extended GSM900) band consists of the absolute radio frequency channel
numbers 975 to 1023. The channel number 0 (zero) is also taken into account.
This means that a total of 50 radio frequency channels are included in this
E-GSM900 band.</p>


<p>For a GSM operator, the E-GSM900 extension band can represent
the most cost-effective way of adding capacity to his system if the Primary
GSM spectrum is used.</p>


<p>The additional band is added to the lower end of the currently
used GSM900 spectrum as presented in the figure below:</p>


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<p>The Tri-Band release provides an implementation in which
the E-GSM900 and P-GSM900 frequencies are configured in separate cells. In
other words, the frequencies from the primary GSM900 band and the frequencies
from the extended GSM900 band cannot be configured in the same cell. This
feature requires also support from MS.</p>
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