| 摘要 |
<p>Free-space, line-of-sight, electro-magnetic communication (i.e., via light or microwaves) is employed to provide a wide range of communication services to geographically scattered users. A relay point (30) or end point (40) is typically associated with each user. Each relay point (30) receives and retransmits information via line-of-sight communication. The end points (40) are also receivers and transmitters of information via line-of-sight communication. Although spaced from one another, the relay and end points are close enough to one another to communicate via line-of-sight links. Hard-wired connections to the users are therefore unnecessary. Broadcast radio frequency communication capability may be provided as a backup for maintaining at least some service in the event of line-of-sight communication failure or interruption. This radio capability may additionally be used to provide cellular communication service to small cells associated with the relay and end points. <IMAGE></p> |
