Hi Pix and NK
t3101 is the timer of IMMEDIATE CHANNEL ASSIGMENT so is not related to the sdcch ! immediate assignment means the MS’s will be assigned a signaling channel directly from TCH, and hence the word “direct” came. i am confused because you are talking about sdcch. plz you can read the definition of the immediate assignment or t3101 again !
once you answer, I have more to say regarding the issue.