Multiplex communications – Wide area network – Packet switching
Patent
1991-02-06
1993-01-19
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 8512, 3701001, 370 855, H04J 302
Patent
active
051812029
ABSTRACT:
A transmit-receive station connected to a high speed ring bus carrying data signals that may be received from and sent to each station on the ring bus has two sources of transmit clocking signals. One source is based on the frequency and phase of data signals received on the ring bus from another station and the other source is a local crystal oscillator having essentially the same frequency as the first source but in an indeterminate phase. When changing the source of clocking signals for transmission of data originating at the station, bit slippage may be minimized by providing the local oscillator output signal in four phases and using the phase most nearly aligned with the other clocking signal when the change is made.
Control of access to transmit by a station employs a token having a message field of seven bits and a access control bit. Each message from ready for transmission is assigned a priority number which is used with the token to cause the data message frames at different stations to be transmitted in a sequence based on their respective priority numbers.
REFERENCES:
patent: 3980820 (1976-09-01), Niemi
patent: 4553234 (1985-11-01), Brandsmo
patent: 4602365 (1986-07-01), White
patent: 4627070 (1986-12-01), Champlin
patent: 4646291 (1987-02-01), Perntz
patent: 4665518 (1987-05-01), Champlin
patent: 4759015 (1988-07-01), Takai
patent: 4760571 (1988-07-01), Schwarz
patent: 4982400 (1991-01-01), Ebersole
Rydell Earl E.
Walser Robert A.
FMC Corporation
Kamp R. C.
Lee Michael
Megley R. B.
Olms Douglas W.
LandOfFree
Ring bus station having dual oscillators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ring bus station having dual oscillators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ring bus station having dual oscillators will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-106006