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Word Count: 653
SUBJECT Mechanism Report WORDS 663 Cable and DSL Modems Since the creation of the Internet home users have always craved power The only thing available was ISDN and the traditional 56k modem With the release of cable modems and the discovery of DSL technology the Internet can be navigated at blazing speeds Cable Modem TYPES Cable modems were introduced in 1995 There are three types of them external internal and interactive setup box The external modem is a small box that is connected to the computer The installation of an Ethernet card is required for this type Since it connects to the computer by a USB port the installation is very easy The second type internal is directly inserted into a slot on the motherboard called the PCI bus This particular modem is only available for PC use and not Macintosh Upgrades may be needed to synchronize a users computer Some Internet service providers may not support internal modems The last type interactive setup box relies on the TV to display output No catches involved with this type Figure 1- Cable Modem System PARTS A cable modem has a complex process of operation It is made up of a tuner demodulator burst modulator MAC interface and CPU TUNER The tuner plugs directly into the modem Its responsible for letting signals pass through it These signals communicate with the PC and the modem itself DEMODULATOR The demodulator analyzes the receiving signals BURST MODULATOR The burst modulator feeds the tuner with signals Also it decodes information hidden in the signals MAC The MAC is a control mechanism which sits between the transmit and receive paths INTERFACE The interface is simply data coming from a users PC CPU The users CPU is used only to assist external cable modems DSL TYPES DSL has been around since 1998 There 9
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