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Baud Rate Problem

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Some computers need to have large numbers of RS-232 lines (e.g. servers or Internet providers). For this reason, plug-in cards with multiple RS-232 lines exist. Suppose that such a card contains a processor that must sample each incoming line at 8 times the baud rate to see if the incoming bit is a 0 or a 1. Also suppose that such a sample takes 1 usec. For 28,800-bps lines operating at 3200 baud, how many lines can the processor support? Note: The baud rate of a line is the number of signal changes per second. A 3200-baud line can support 28,800 bps if each signalling interval encodes 9 bits using various amplitudes, frequencies and phases. 56K modems do not use RS-232, so are not a suitable example of RS-232 timing.

Number of lines required = 28,800*3200*10^-6 lines

I have a question where did the 10^6 come from? I am trying to figure on how this problem was solved.

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Solution Summary

The solution defines baud rate and baud and gives an example of each before explaining how the given problem was solved. The solution is approximately 210 words.

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Baud Rate: It's the number of signal changes per second.
Baud: The baud, indicates the number of bits per second that are transmitted.

For example, 3200 baud means that 3200 bits are transmitted each second. At higher speeds, it is possible to encode more than one bit in each ...

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