I told you a mistake about 4.Traffic channel
Traffic channel is a bad declaration of sdcch.
example:
with 1 TRX, you declare MBCCHC (C=combined=1 TS for SDCCH and MBCCH)
with 2 TRX, you declare MBCCH (1 TS for BCHH and 1 TS for SDCCH)
If you declare MBCCHC with 2TRX then you have alarm Traffic channel activation failure.