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

By C. G. Guy (auth.)

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The receiver will apply a threshold to the incoming signal, taking anything over the threshold to be a I and anything below it to be a zero. 6 shows that 51 Baseband Digital Transmission some bits will be determined in error if the transmitted value of a 1 is too close to that of a 0. How much the curves illustrating the possible variations in received signal overlap is determined by the signal-to-noise ratio of the channel. 2) where a is a constant determined by the line coding scheme and Q(x) is a function giving the probability that a particular value of a random variable will be above (or below) a fixed point, for a particular distribution.

This code maps 4 data bits to each period and is known as 4B3T or 4-binary, 3 ternary. 1). 1 An example of a 4B3T code Data Bits Mode 1 Mode 2 0000 +1 0-1 +1 0-1 0001 -1 +1 0 -1 +1 0 0010 0-1 +1 0-1 +1 0011 +1 -1 0 +1 -1 0 0100 0 0 +1 0 0-1 0101 0 +1 0 0-1 0 0110 +1 0 0 -1 0 0 0111 +1 -1 +1 -1 +1 -1 1000 -1 +1 +1 +1 -1 -1 1001 +1 +1 -1 -1 -1 +1 1010 +1 +1 +1 -1 -1 -1 1011 +1 0 +1 -1 0-1 1100 0 +1 +1 0-1 -1 1101 +1 +1 0 -1 -1 0 1110 0 +1 -1 0 +1 -1 1111 -1 0 +1 -1 0 +1 Which one is chosen depends on the cumulative sum of all the previous levels.

This could be achieved by having two physical links or by sharing space on one link. The section on multiplexing, later on in this chapter, describes one method of sharing the capacity of a link in a way that can make it appear to be full duplex. It is worth noting here that the terms duplex and half duplex are used in a slightly different way when talking about connecting terminals to hosts. If the software is set up so that a character typed at the terminal keyboard is immediately echoed to the screen, as well as being sent to the host, then the link is said to be half duplex.

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