Multiplex communications – Wide area network – Packet switching
Patent
1984-10-01
1987-07-14
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
34082501, H04J 302, H04B 346
Patent
active
046807500
ABSTRACT:
Malfunctions in an automatic span line switch due to resonances in high-speed span lines are avoided by interposing signal-free intervals whenever the switch causes a possible phase change to occur in the signal being supplied to the span, preventing the transmission of partial signal pulses, and using quasi-random code and keep-alive signals. Unnecessary phase changes are avoided by verifying the validity of data before allowing it to be put on the span following a data loss; disabling the error detection circuitry for a limited time following a switching operation; and preventing the switching of low-priority span on standby if the failure has been remedied during the standby period. In other aspects of the invention, the switch is made adaptable to various types of high-speed spans and to a wide range of quality requirements by allowing for individual adjustment of loss-of-signal time, burst protection time, error count, and bit count for failure and restoral detection, and by selectively allowing different types of errors to be detected. Finally, backup due to one-sided restoral is eliminated by refailing a restored switch if its mate does not restore.
REFERENCES:
patent: 3457373 (1969-07-01), Van Duuren et al.
patent: 3649915 (1972-03-01), Mildonian, Jr.
patent: 3864533 (1975-02-01), Erlund
patent: 3983340 (1976-09-01), Lima et al.
patent: 4042794 (1977-08-01), Lima et al.
patent: 4365248 (1982-12-01), Bargeton et al.
patent: 4393493 (1983-07-01), Edwards
patent: 4477895 (1984-10-01), Casper et al.
Lynch Communication Systems, Inc.
Olms Douglas W.
LandOfFree
Universal high-speed span line switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Universal high-speed span line switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal high-speed span line switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1431603