fast ACCH (GSM) (FACCH)
Associated Control Channels(ACCH) are channels for the transmission of signaling and control data in GSM networks. A distinction is made between slow ACCHs, i.e. the Slow Associated Control Channel( SACCH) with 50 bit/s, and the fast Fast ACCH (FACCH) with 333 bit/s. The FACCH can be assigned for time-critical signaling. The FACCH can be assigned for time-critical signaling. The FACCH has a much better block error rate than the slower ACCH versions.