Racal Data Communications Inc.

Racal-Milgo Limited

William A Dambrackas

Charles R Baugh

Michael B Marshall

Yoon B Park

Larry S Greenstein

Edwin J Hilpert

Alex Downie

George R Kushin

In a data communication system involving modems transmitting over a link including terrestrial and one or more satellite links, a nontransmitting modem sends a secondary channel tone during the absence of data transmission. The cessation of said tone is detected by the other modem and used to de-squelch the remote modem receiver. In this manner, the receiver is protected from echoes impinging upon it during long transmission delay times. This method optimizes data throughput by adapting to the transmission delay of the circuit.

Method and apparatus for maximizing efficiency in satellite

A statistical multiplexer is disclosed that includes interfaces for asynchronous and synchronous data equipment, and a CPU/control logic. The CPU/control logic cooperates with the interface for the synchronous data equipment for allocating bandwidth to synchronous data equipment when bandwidth is requested and for deallocating bandwidth when bandwidth is no longer required. The allocation and deallocation of bandwidth is controlled by predetermined control frames generated by the CPU/control logic. Such control frames are responded to by the synchronous data equipment interface of the multiplexer originating the control frame and the synchronous data equipment interface of the multiplexer receiving control frames.

Statistical multiplexer with dynamic bandwidth allocation for

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Miami, FL, United States of America

William A Dambrackas