Hi guru,
This 51 and 26 frames are the logical channel .
The tdma frame of 8 time slots(physical channel), on which the time slot 0(bcch time slot) contains the 51 multiframes and repeates on every ts0 of tdma frame,and the 26 multiframe is placed on tch ts .
I realize that 900 cells are carrying more sdcch traffic than 1800.i have try to change some parameters like cro,crh,layerthr but still no changes.by having different values on accmin for 1800 and 900 can it be a reason?