Excavating
Patent
1993-12-03
1996-05-14
Envall, Jr., Roy N.
Excavating
370 953, G06F 1110
Patent
active
055175074
ABSTRACT:
A data message (201) is transmitted (301) to a plurality of communication units (103, 105, 107, and 109). The data message (201) is received (401) by the plurality of communication units, which determine (403) whether the quality of the received data message is acceptable. When at least one of the plurality of communication units determines that the received data message is of unacceptable quality, the at least one of the plurality of communication units transmits (411) an energy burst (203) in a predetermined time window. Upon detection of the energy burst (203), the transmitting device may retransmit (309) the data message to the plurality of communication units.
REFERENCES:
patent: 4888767 (1989-12-01), Furuya et al.
patent: 4914654 (1990-04-01), Matsuda et al.
patent: 4951281 (1990-04-01), Muto et al.
patent: 5210751 (1993-05-01), Onoe et al.
Crisler Kenneth J.
Gannon Mark A.
Marturano Lawrence J.
Needham Michael L.
Brown Thomas E.
Envall Jr. Roy N.
Lukasik Susan L.
Motorola Inc.
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