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a) Terrestrial Radio Channels i) Wireless LAN uses local radio channels ii) Wireless WAN uses wide radio channels b) Satellite Radio Channels i) Use satellite communication links. Consist of geostationary satellites, and  low-earth orbiting satellites (LEO – i.e GPS sats). The Network Core  1) Packet Switching  – a network communication that does not reserve bandwidth for  any connection. Internet is a best effort packet switched network. a) Supports more users than circuit switching, and provides almost continuous  usage of the link. b) Store and Forward Delay  – each switch must wait for entire packet to arrive  before sending out first bit of packet. Delay = Q links x L/R trans delay. c) Queuing Delay –  If link is busy then packet must wait in output buffer. 2) Circuit Switching –  a network communication that reserves bandwidth for each  connection (called a circuit) either by FDM or TDM. Dedicated Connection.
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This note was uploaded on 10/08/2008 for the course ECE 4450 taught by Professor Wicker during the Fall '07 term at Cornell.

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page2 - a Terrestrial Radio Channels i Wireless LAN uses...

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