(ii) What is the significance of twisting in twisted pair cable?
(iii) How do guided media differ from unguided media?
Answer:
(i) List the advantages of broadband coaxial cable over twisted pair.
Broadband Coaxial Cable
The other kind of co-axial cable systems uses analog transmission on standard cable television cabling. These can be used for digital data transfer also. It is cabled broadband. Although the term "broadband" come from the telephone world, where it refers to anything wider than 4 kHz, in the computer networking world "broadband cable" means any cable network using analog transmission with bandwidth wider than 256 kHz.
Since broadband networks use standard cable television technology, the cables can be used up to 300 MHz (and often up to 450 MHz) and can run for nearly 100 km due to the analog signalling, which is much less critical than digital signalling. To transmit digital signals on an analog network, each interface must contain electronics to convert the outgoing bit stream to an analog signal, and the incoming analog signal to a bit stream. Depending on the type of these electronics 1 bps may occupy roughly 1 Hz of bandwidth. At higher frequencies, many bits per Hz are possible using advanced modulation techniques.
Broadband systems are divided up into multiple channels. Frequently the 6MHz channels used for television broadcasting. Each channel can be used for analog television, CD-quality audio or a digital bit stream at, say 3 Mbps, independent of the others. Television and data can be mixed on one cable.
(ii) What is the significance of twisting in twisted pair cable?
Twisted Pair
Although the bandwidth characteristics of magnetic tape are excellent, the delay characteristics are poor.
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