Redundant switchover system for TDMA satellite communication equ

Details Redundant switchover system for TDMA satellite communication equ Redundant switchover system for TDMA satellite communication equ

1984-03-15

1986-06-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 16, H04J 314, H04J 316

Patent

active

045970793

ABSTRACT:
In a redundant switchover system for a TDMA satellite communication system for relaying messages from earth station to earth station (A, B, C) via a communication satellite (SAT), an initially active terminal unit (1) for determines at an early stage that the transmit burst synchronization is lost, and an initially stand-by terminal unit (2) determines at a later stage that the transmit burst synchronization is lost. Thus, a fault in only the transmit portion of a first unit, which is undetected by other means, is detected by the first terminal unit, but not the second terminal unit. The second terminal unit does not determine loss of transmit burst synchronization until after the second transmit portion has been in operation for a sufficient period of time to establish whether it is operating properly.

REFERENCES:
patent: 4397018 (1983-08-01), Fennel, Jr. et al.

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