L8 - Wireless Local Loops 1998 - FCC allocated 33 bands of...

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Wireless Local Loops 1998 - FCC allocated 33 bands of 6 mhz each, in the 2.1-2.5 Ghz range, for two- way radio. Potential range: 50 km. Used for wireless local loops - MMDS (Multichannel Multipoint distribution service). Then in the 28-31 Ghz range a 1.3 Ghz band was allocated to a local loop service: LMDS (Local Multipoint Distribution Service). Potential range: 2-5 km. Subject to clear line-of-sight and rain sensitivity. Standards under development.
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LMDS - 36 Gb/s downstream, 1 Mb/s upstream, shared. Maximum 9,000 active receivers per sector , 4 sectors. Insert Fig. 2-30. Problems - Need line-of-sight, avoid trees Rain causes errors
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Trunks and Multiplexing - Many users sharing a common link - cable, wire or optical fiber. Reason for multiplexing One high capacity link serves many users’ needs simultaneously.
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Categories of multiplexing 1. Time division multiplexing. Synchronous time division multiplexing. Statistical time division multiplexing.
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L8 - Wireless Local Loops 1998 - FCC allocated 33 bands of...

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