It is desired to have full duplex communication over a cable between A and B suc

Question

It is desired to have full duplex communication over a cable between A and B such that
they can simultaneously transmit 56 kilobits/second to each other. They must share a total
bandwidth of 60 khz, which can be divided between them by band pass filters, assumed with no
guard band waste. Assume a pulse rate D pulses/second requires a bandwidth of W = 1.5D herz.
Multiple phase shift keying is to be used, and each pulse must carry an integer number of bits.

Suppose the signal from B is weaker, so that B needs to use 4-phase shift keying.

a) Find how much bandwidth B needs to send its 56 kb/s.

b) Then find how many signal points (phases) A must use, given its remaining share of
the bandwidth.

Explanation / Answer

Find maximum udp payload(on my test bed, its 1472 byte) Create non compressible data with 1472 byte size Send this data from a server to a client multiple times(on my test, its 5000 packets) Client start stopwatch at the time the first packet arrive When all data has been sent, send notification to client stating all data has been sent Client stop stopwatch I calculate bandwidth as (total packet sent(5000) * MTU(1500bytes)) / time lapse I notice that some packets are loss. a best, 20% loss. at worst 40% loss. I did not account this when calculating the bandwidth. I suspect client network device experience buffer overrun. Do I need to take account this factor?

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