Cable Modem makes human life comfortable

Cable Modem
Imagine a world where broadband did not exit. Without this high-speed data transfer, would the Internet still be the hub of information, pictures, movies and business opportunities it is today? The fast connection speeds required the invention of the cable modem and the man who did that was Iranian-born American electrical engineer Rouzbeh Yassini (birth year: 1958).
Yassini worked for General Electric in 1981 building television receivers. To understand how the signals flowed, he took home television sets and dismantled them see how they functioned. This knowledge proved useful when in 1986 he joined Proteon, a data-networking company that used a network cable called “twisted pair” to carry data.
Despite being told that video and data did not mix, Yassini realized right from the beginning that he could employ the same coaxial wire that carried cable television as well. In 1990 he created a new company called LAN-city Corporation. He and his thirteen-strong tea, started to build a device that would provide an interface between a data network on one side and a cable television network to the other-the first cable modem. The initial model retailed at a staggering $15,000 and took these three months to install. Just five years later, however, the third generation LAN-city modem was “plug and play” and cost just $500.
The company was bought very soon after this for $59 million by Bay Networks. Yassini went on to spearhead the development, implementation and certification of DOCSIS, a standard for carrying data over cable modems.

A cable modem is a type of network bridge and modem that provides bi-directional data communication via radio frequency channels on a hybrid fiber-coaxial (HFC) and RFoG infrastructure. Cable modems can have a problem known in industry jargon as “flap” or “flapping”. A modem flap is when the connection by the modem to the head-end has been dropped (gone offline) and then comes back online. The time offline or rate of flap is not typically recorded, only the incidence. While this is a common occurrence and usually unnoticed, if a modem’s flap is extremely high, these disconnects can cause service to be disrupted.

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