L8 - Circuit and packet virtual circuit switching revisited...

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Circuit and packet virtual circuit switching revisited.
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Circuit and Packet Switching Show Fig. 2-43 (removes obsolete message switching in old 2-39)
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In packet switching - routing information is in a header in the beginning. Packet might be switched before the whole packet is received.
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The Mobile Telephone System First generation : Analog voice 1960's IMTS - 23 voice channels,100 kilometer region, 150-450 mhz band. High power, few users. 1982 - AMPS (Advanced Mobile Phone System) 10 kilometer cells - allows about 100 cells in same 100 kilometer region + only 1% of power of old system. 7-cell frequency reuse. One base station per cell.
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Increasing capacity with microcells - higher density, less power, but more base stations.
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AMPS: 832 Full duplex channels - (uplink) 824-849 mhz (downlink) 869-894 mhz. ( Full duplex means: transmission between two end points can be in both directions at the same time. Each mobile gets an uplink channel and a downlink channel.) Frequency reuse - group of 7 cells About 30 khz per- channel bandwidth.
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