GSM: Dedicated Channels
traffic channels (TCH) carry user speech and data, as
well as some signaling
a TCH is always allocated with a corresponding Slow
Associated Control Channel (SACCH) used for
reporting handover measurements
TCH slots may be ‘stolen’ from a traffic channel for
Fast Associated Control Channel (FACCH) signaling,
used for call establishment, handover execution, and
authentication
full rate TCH/SACCH occupies one time slot every 8
burst periods (TDMA frame), allowing 8 traffic
channels per carrier frequency