Question

A multiplexer combines five 750 kbps channels A, B, C, D, E (see Figure 1 below). Each frame has 1 synchronisation bit added to the beginning of the frame and has slot size of 6 bits, one slot per channel. Synchronous time division multiplexing will start from Channel A, then B, C, D, E and then back to channel A, then B, C, D, E and so on... a) Draw a diagram to show the content of the first two frames of the output for the inputs as shown in the figure below. In your diagram, for each frame, show all the slots containing bits from each channel and the synchronisation bit. (2 marks) (Sync bit is added at the beginning of the frame. It is up to you to choose what sync bit for each frame, as long as there is 1 sync bit at the beginning of each frame. The data generated by each channel is shown in the figure below) b) What is the frame rate (frames per second) (2 marks) and the frame duration (in microsecond) (2 marks)?

Answer 1

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Given that A multiplexer combines five 750 kbps Channels A,BCoE Each fram has I Synchlonisation bet added to the ... beginning of the frame and has slot size. of 6 bits. Solution 6ܣܘܢ} I Syne bit ܐ 9 Tolna D C B A E DCB A sync bit. -> E channet bit e 2 1. flame 2 ☺ channel rate = 150000 bps I bit time duration - - ooo see flame duration : l bit flame duration = 133 us [because of next but time duration, and then set of 5 bits are coming and bundled into new frame] feames per second han = 750000 trames per second e Bit rate of mux output= (75000of games x 64 bits/frone) pel/second = 4500000 bits per second = 4:50Mbps