if u used Freq reuse 3*3(in 1 cluster) so its mean 22/3= 7 arfcn(in 1 bts).1 bts have 3 sector so configuration bts is s3/2/2(3+2+2=7arfcn).the result is sector 1=3 TRX
sector 2=2 TRX
sector 3=2 TRX,total 7 TRX in 1 BTS
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