There are two types of multi frame:

1) 26 TDMA--frame of multiframe is used to carry TCH, SACCH and FACCH.

2) 50 TDMA--frame multiframe is used to carry BCCH, CCH, SDCCH AND SACCH.

Five types of bursts:

1. Normal Burst (NB):

. It is used to transmit both information and control bits

. T trail bits are used as guard time in achieving power level.-Training is used to estimate channel characteristics.

. SF stealing flags tells whether data or signalling is being transmitted.

. Normally for FACCH.

Access Burst: . It is used to send the Random Access Channel (RACH) information - RACh contains the first message from MS to BTS.

. It has a long guard period to allow BTS to calculate the Ms distance from the BTS and to provide timing advance information to MS.

3) Frequency Correction Burst (FCCH):

. It uses just to transmit Frequency Correction Channel (FCCH).

.142 bits are set to "0" in the known time slots.

4) Synchronization Burst (SCH):

. It is used to transmit synchronization information

. The training sequence includes a well-known sequence of bits

. Alos contains the running number of TDMA frame.

5) Dummy Burst:-

. It is transmitted when no other bursts are to be transmitted

. Uses same frequency channel which is used for BCCH to ensure if BCCH Transmits Burst in each time slot

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