Optical Fiber• Optical fiber is made of glass or plastic• It transmits signals in the form of lightThe Nature of Light• The speed of light – 300,000 Km/sec in a vacuum – Depends on the density of the medium through which it is traveling• Other properties of light – Refraction, Critical angle, Reflection 7-15
Fiber-optic Cable Connectors• SC (subscriber channel) connector used for cable TV. It uses push/pull locking system• ST (straight-tip) connector used for connecting cable to networking device. It uses a reliable bayonet locking system• MT-RJ is the same size as RJ45 7-22
Wireless Transmission Waves• Radio waves are used for multicast communications, such as radio and television, and paging systems• Microwaves are used for unicast communication such as cellular telephones, satellite networks, and wireless LANs• Infrared signals can be used for short-range communication in a closed area using line-of-sight propagation 7-29
Infrared• Infrared waves with frequencies from 300 GHz to 400 THz for short-range communication in a closed area using line- of-sight propagation• Having high frequencies, it cannot penetrate walls• IrDA (Infrared Data Association) for standards• Example: IrDA port for wireless keyboard – Originally defined a data rate of 75 kbps for a distance up to 8 m – Recent standard for a data rate of 4 Mbps 7-31
A particular slide catching your eye?
Clipping is a handy way to collect important slides you want to go back to later.