| 摘要 |
A system for accessing a communication channel and displaying information to a user comprises means for transmitting successive packets of information over said communication channel; access means for prioritizing access of said packets of information to said communications channel said access means including means for withholding the transmission of said packets over said communication channel for a predetermined period of time; means for continuously sensing the state of said communication channel during said predetermined period of time; means for determining if said channel is clear after waiting for said predetermined period of time; and means for transmitting said packet after said predetermined period of time if said channel is clear; and command and control means coupled to said location determination means for accepting queries from a user and displaying the location of said transmitting devices on a map, said command and control means including a plurality of subscriber records and subscriber management means for accessing and modifying said records, said command and control means also including network management means for displaying a graphical network tree, said tree containing all of said transmitting devices on the network, said network management means including mapping means for positioning devices on said map and for defining regions of said map in response to user commands.
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