hi all,
i am new to the field of GSM, i am working on NOKIA BSS, recently there was a major outage due to faliur of the optical backbone, when the system was restored i found that the LAPD of most the trx’s and transcoders where not restored and where still blocked i had to bring them up manually,
i am wondering what could have possibly went wrong is it a problem with the BSC. i am working on NOKIA BSC 3i s11.