(b) A 900 MHz digital cellular network has the following characteristics: ink of 925-945MHz R-F channel spacing=400kHz number of time slots per R.F channel=8 Determine the: (i) channel bandwidth; (ii) number of up-link RF channels; (iii) total number of up-link TDM channels. (7 marks)

Channel bandwidth:The channel bandwidth is the difference between the upper and lower frequencies of the channel. In this case, the channel bandwidth is: Number of up-link RF channels:The number of up-link RF channels can be calculated by dividing the total frequency range available for the up-link by the channel spacing. In this case, the total frequency range available for the up-link is: So, the number of up-link RF channels is: Total number of up-link TDM channels:The total number of up-link TDM channels can be calculated by multiplying the number of up-link RF channels by the number of time slots per RF channel. In this case, the total number of up-link TDM channels is: Therefore, the channel bandwidth is , the number of up-link RF channels is , and the total number of up-link TDM channels is .