Multiplex communications – Wide area network – Packet switching
Patent
1988-11-30
1990-05-29
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 131, 370 97, H04J 302, H04J 314
Patent
active
049301187
ABSTRACT:
In a demand assignment TDMA communication system, a central station transmits a frame sync and a polling signal at periodic intervals to terminal stations to elicit a response therefrom. Each terminal station transmits a test signal in response to reception of the frame sync. The central station or a repeater station detects the strength of the test signals received by a regular-channel receiver and a spare-channel receiver and determines if each of the receivers is operating normally or abnormally. The response received by the regular-channel receiver is supplied to a utilization circuit when this receiver is determined as operating normally and the response received by the spare-channel receiver is supplied instead to the utilization circuit when the regular-channel receiver is determined as operating abnormally while the spare-channel receiver is determined as operating normally.
REFERENCES:
patent: 4059736 (1977-11-01), Perucca et al.
patent: 4442518 (1984-04-01), Morimoto
patent: 4597079 (1986-06-01), Aoki et al.
Jung Min
NEC Corporation
Olms Douglas W.
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