Please, help to investigate problem: In Siemens network we placed new BSC, and connect to it some BS. After that in our alarm center occurs many messages: “3 consecutive DL TRAU/PCU frames bad” it concens only BS, connected to new BSC. On other BSC such messages also presents, but amount is low.
We contact Siemens TAC, but they didn’t tell us somth. useful infirmation. About qos – CDR in normal correlation. I suggest that the reason for this situation is in BSC’s module PLLH – which controls synchronization. Abis link was chacked – no errors (for more than 24 hours).