The use and general aspects of the A-bis interface are given in TS 08.51
. The split of telecommunications functions and management procedures between BSC and BTS are defined in TS 08.52
. The split of operations and maintenance functions and procedures between BSC and BTS is defined in the 12 series of recommendations. TS 12.21
describes the operations and maintenance procedures, messages, and message codings.
This recommendation covers the transport of the messages by Layer 2 frames as defined in TS 08.56