CS 313 Introduction to Computer Networking & Telecommunication. Physical Layer – Transmission Media. Topics. Guided Transmission Media Wireless Transmission Communication Satellites. Transmission Media. Physical layer: Transport a raw bit stream Physical media Guided media
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Physical Layer – Transmission Media
Chi-Cheng Lin, Winona State University
To reduce electrical interference
(a) Category 3 UTP.
(b) Category 5 UTP.
(a) Three examples of a light ray from inside a silica fiber impinging on the air/silica boundary at different angles.
(b) Light trapped by total internal reflection.
(a) Side view of a single fiber.
(b) End view of a sheath with three fibers.
Ground Sky Line-of-sight
Bent pipe mode
Communication satellites and some of their properties, including altitude above the earth, round-trip delay time and number of satellites needed for global coverage.
(Geostationary Earth Orbit)
(Medium Earth Orbit), app.: GPS
(Low Earth Orbit), voice/data communication
VSATs using a hub.
VSATs: Very Small Aperture Terminals