A. Frequency division multiple access
B. Time division multiple access
C. Code division multiple access
D. Bandwidth division multiple access
Explanation: The channelization protocols use frequency, time and code to divide the bandwidth of the channel. Bandwidth is divided into frequency bands in FDMA, same bandwidth is used by the stations in TDMA.
A. Preamble bits
B. Synchronization bytes
C. Guard bits
D. Start points
Explanation: Time division multiple access allocates the time slots for station to use the channel. These time slots are synchronized by preamble bits, which acts as guard time between two time slots.