Data Communications for Engineers by C. G. Guy (auth.)

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By C. G. Guy (auth.)

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The class of a computer is often given as 16 bits or 32 bits, the figures giving a rough measure of the computer's sophistication. Amongst other things the number (16 or 32) is a measure of how many bits of data can be transferred in parallel. In addition to moving the data bits around, the controlling processor within the computer has to provide extra bits of information to specify where the destination of the data bits (the address) and some means of timing so that the destination, for example the memory or disk unit, knows that the data lines carry valid data intended for them.

R = 0 - - - ; _ 112 ..................... 5 ,,·. '"·. 5 \\ •, -- ................... 1 Normalised frequency spectra of raised cosine filters with various rolloff factors (i) Bandwidth requirement: Some codes require more bandwidth for a given data rate than others, depending on how the data bits are mapped to signal elements. g. telephone channels). (ii) Clock recovery: Some codes are better than others at providing clocking information to the receiver, which is an important consideration for high speed synchronous data transfer.

Data Communications for Engineers 38 This can be preset but it is quite common for the receiver to use the first few transmitted characters to work out the transmission rate. It does this by expecting the first few characters to be, usually, a Carriage Return. By sampling the length of the first bit in this known bit pattern it can establish the transmission rate. This feature is sometimes known as autobaud, after the commonly used name for the transmission rate the baud rate. In fact, the baud rate has a precise meaning, which may or may not correspond to the bit rate (see chapter 3), so should not be used in this context.

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