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It is a smallest operating system of size 36 kb. It was used in the features phones.

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As the name indicates, in guided media Electrical/Optical signals are passed through a solid medium (different types of cables/wires) As the path traversed by the signals is guided by the size, shape and length of the wire, this type of media is called guided media. Also, in guided media, the signals are confined within the wire and do not propogate outside of the wire/media. E.g., Copper Unshielded Twisted Pair (UTP), Copper Shielded Twisted Pair (STP), Copper Co-axial cables, Fiber Optic Cables. Twisted Pair Copper:  It is the most widely deployed media type across the world, as the last mile telephone link connecting  every home with the local telephone exchange is made of twisted pair copper. These telephone lines are reused as last mile DSL access links to access the internet from home. They are also used in Ethernet LAN cables within homes and offices. They support  low to High Data Rates (in order of Giga bits) However, they are effective o...

The telecommunications industry differentiates between several distinct FTTX configurations. The terms in most widespread use today are: FTTP  ( fiber-to-the-premises ): This term is used either as a blanket term for both FTTH and FTTB, or where the fiber network includes both homes and small businesses. FTTH  ( fiber-to-the-home ): Fiber reaches the boundary of the living space, such as a box on the outside wall of a home.  Passive optical networks  and  point-to-point Ethernet  are architectures that deliver  triple-play  services over FTTH networks directly from an operator's  central office . [1] [2] FTTB  ( fiber-to-the-building, -business, or -basement ): Fiber reaches the boundary of the building, such as the basement in a  multi-dwelling unit , with the final connection to the individual living space being made via alternative means, similar to the curb or pole technologies. FTTD  ( fiber-to-the-desktop )...