Layer 2 Failure Reasons 605a50

1. the mobile station stops the transmitting of measurement reports the BTS never get an acknowledge on a Layer 2 message after the time T200 LAPD N200 is the maximum number of retransmissions 2. the mobile station stops the transmitting of measurement reports the BTS never get an acknowledge on a Layer 2 message after the time T200 LAPD N200 is the maximum number of retransmissions

3. Usually this timer N200 come with T200 during establish the SABAM message which is in Layer 2

during the assaying the channels in the call setup(SDCCH) or during the handover(FACH/FullTCH, FACH/half TCH ) , in the TEMs will see the N200 time out come with handover failure and with data link failure and like this case can be come due to : Link transmission TEMS ( there is problem in the TEMS) hardware issue in the Maine processer in the BTS itself causing delay . Bad RxQual UL 4. N200:means the number of resend SDCCH to moble station The value specifies the maximum number of retransmitting a frame Timer T200 has expired N200 +1 times (MS does not respond any more).

check if there is: bad coverage high interference hardware faulty