By C. G. Guy (auth.)
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The advent of cheap receiving antennas and decoders because of direct-broadcast television should mean that a much wider use of satellites is made in areas where the data flow is inherently unidirectional. The major disadvantage of a satellite link is the time delay over the channel because of the distance involved. This can be as high as 300 ms, which could be a problem for some applications. Packet radio systems using the frequency range around 400-500 MHz are coming into use, using network architectures similar to conventional WANs.
It is also possible to perform some pulse shaping before transmission in order to tune the signal to the characteristics of the channel. If the pulses are band limited so that some higher and lower frequency components are removed before transmission, then lSI will become much less of a problem. Noise is the name given to any unwanted interference which is 28 Data Communications for Engineers introduced by whatever means between the transmitter and the receiver. The receiver must be capable of distinguishing the wanted signal, however distorted by the effects described in previous sections, from the noise.
If either will do then the current mode is retained. This can be illustrated by assigning the 4B3T code blocks for the following data sequence: Data Bits 0001 1011 ~~ 1001 1110 1111 1011 2 2 2 2 0111 1001 0001 4B3T code -+0 +0+ --+ 0+- -0+ -0- +-+ ++- -+0 Running Sum 0 +2 +1 +1 +1 -1 0 +1 +1 Baseband Digital Transmission 49 The frequency spectrum of the 4B3T code is fairly even up to the signal element rate, with no DC level for random data. However, there is a significant low frequency component which might be a disadvantage in some circumstances.