Abstract: In a mobile satellite system, a mobile communication system includes a user interface system, an antenna system, a transceiver system, a logic and signaling system. The logic and signaling system provides a communication function permitting the mobile communication system to roam between the mobile satellite system and a terrestrial based communication system responsive to the user selection of a primary service and an alternate service. The mobile communication system also includes a digital terminal equipment unit initiating setup and release for a data call, and a facsimile interface unit initiating setup and release for a facsimile call. The facsimile interface unit generates a line control packet responsive to a line state transition indicating transmission of information associated with a new line state over a communication channel.
Type:
Grant
Filed:
July 29, 1998
Date of Patent:
August 21, 2001
Assignee:
Motient Services Inc.
Inventors:
Michael K. Ward, Gary G. Churan, William R. Tisdale, David J. Ross