What is FACCH (Fast Associated Control Channel)?

The Fast Associated Control Channel shows up in place of the traffic channel when extensive signalling is needed among the GSM mobile and the network when the versatile is in call. FACCH is utilized to convey data between GSM Mobile Station(MS) and Base Transceiver Station(BTS) more rapidly. FACCH data messages can without much effort be communicated in 20 ms duration, as utilized by traffic channels(TCH). The FACCH channel sends messages by supplanting speech information with flagging information for brief timeframes.