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Baud Rate

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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 signaling 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.

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    To transmit data at 33600 bps using a signal with a baud rate of 6000, we would need to transmit 33600/6000 = 5.6 bits/baud. This is effectively saying that we need to transmit 5.6 data bits per signal change.

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