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Modems work by converting digital signals on the computer to and from the analogue signals needed by telephone lines. Their name is derived by combining the two words, modulator and demodulator. They also have a telephone line socket, which is why they must be approved by the Australian Communications and Media Authority(1) (ACMA) for use in Australia.
Your modem must be compatible with your computer type, so when you buy one make sure you've got the right software and computer cable for your type of computer.
Some modems also come with software that allows your computer to send and receive faxes, or even act as a telephone answering machine.

2) Modem Block Diagram




3) Cross-over cables



Ethernet crossover cables are most often used in home networks when connecting two ethernet computers without a hub. An Ethernet crossover cable has it's send and receive wires crossed. When using a hub or switch, this is automatically done for you.



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Approximate Pages: 15 (250 words per double-spaced page)

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