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Business Data Communications?

A company's telephone exchange digitizes telephone channels at 8000 smp/s,using 8 Bits for quantization. this telephone exchange must transmit simultaneously 24 of these telephone channels over a communications link. what is the required data rate? and in order to provide answering machine service, the telephone exchange can store 3-min audio messages of the same quality as that os the telephone channels. how many megabytes of data storage space are needed to store each of these audio messages?

8000 x 8 bits = 64Kb/s
24 x 64Kb/s = 1536000 -
remenber that the signalling/timing channel will take up one of the 24 channels
(in the U.S.A I beleive they call it a T1 circuit - 23 data 1 signalling/timing....here in the U.K. E1 32x64Kb/s thats 30 data, 1 timing, 1 signalling)

as for the data storage sounds like you could look at it like this:
3 mins ->
3 x 60 = 180
180 x 64000 = 11.5Mb for one 3 min message (bits)
therefore 11.5Mb /8 = 1.44MB for one 3 min message(Bytes)

HALO2

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