Media
Fiber
Twisted PairSatellite
Cellular
T1 - Copper
WAN - packet Switching - leads to high error rates
Fiber x-25 protocol - error correction and detection
Cellular vs. wireless
Think of what kind of bandwidth
Think of what kind of modem information needs to go through
400,000 Calls a day
A 3 minute song - 4mb Sample rate 44khz voice 8khz
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