| 摘要 |
Diverse communication terminals attach via broadband radio to a communicatio ns network at any of typically three hierarchical cell sizes increasing from, typically, a single building to a city to a region. Almost all telecommunications traffic transpires, however, within lowest-level "picocells 1" to and from low cost ''base stations 11" that hav e typically one radio transceiver (111), four optical transceivers (112), an ATM switch (113) and an ATM controller (114). Each local 'base station (11)" is interconnected to a regional "end office switch (12)", where is realized connection to a worldwide wire/fiber line communications backbone (4), upon a multi-hop mesh network (100) via short highly-focused free-sace broadband directional optical links (10). By this free-space wireless broadband access the need for new broadband access cabling the "last mile" to subscriber/users is totally surmounted. Subscriber service is of the order of 20 Mb/s peak rate, and 10 Mb/s average rate.
|
