The present invention provides a communication network comprising a host network, a plurality of base stations, at least a mobile host capable of establishing links to the base stations, and a hierarchy-network of plural routers which are improved in transferring performances for ensuring continuous operations with a reduced load without packet loss.

An automated notification system for use in a facility, including a telephone system, a controller, a paging system, and a warning system. The warning system includes warning lights, warning speakers, and warning displays. The telephone system includes extension handsets, and the paging system includes paging speakers. The extension handsets, paging speakers, warning speakers, warning lights, and warning displays are distributed throughout the facility. An alert condition may be activated using one of the extension handsets or by an activation device within the facility. Upon detection of an alert condition, the controller actuates the warning system and uses the paging system to provide audible and visual warnings throughout the facility, and provides outgoing notification to emergency personnel through the telephone system. Remote units located in outlying areas around the facility are wirelessly signaled by the control unit to provide appropriate warnings in such locations.