EP0093623A2
Expired / Lapsed
EP
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Transceiver multiplexor
Assignee: Xerox Corp
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Filing: 1983-05-05
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Granted: —
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Expires: 2003-05-05
Abstract
Abstract A transceiver multiplexor (22) is adapted to receive data signals transmitted from a plurality of clustered local stations (14) and transmit the signals to a local area neetwork communication medium (16) via a transceiver (20) coupled to the multiplexor or transmit them to any one of the local stations. The multiplexor includes transfer means to perform this function. Collision detecting means is also provided in the multiplexor in order to determine the simultaneous occurrence of transmission between two or more local stations and provide a collision signal to interrupt transmission from the involved stations. This collision detection supplements conventional collision detection at the transceiver capable of detecting transmission collisions when two or more transceivers are attempting communication on the medium but would not be capable of detecting collisions of transmitted data signals among two or more such clustered local stations. A collision among clustered stations connected to the multiplexor is determined from differences in data signals transmitted by two or more stations.
Inventors
- 👤 David R. Boggs
- 👤 John F. Shoch
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 00:49
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
161 words
A transceiver multiplexor for receiving data signals from any one of a plurality of local data-generating stations (14) and transmitting them either to a communication medium (16) via a transceiver (20) coupled thereto or to any of the local stations, and comprising selectively-operable means (22) for transferring a data signal from any transmitting local station to the transceiver, collision detection means each having one inlet coupled to an outlet of a respective local station to receive a transmitted data signal therefrom, and having an other inlet coupled to receive transmitted data from said transfer means, the output of said collision detection means being representative of a collision whenever more than one of the local stations is transmitting a data signal, the output of each collision detector being coupled as an input to its respective local stations, whereby any one of the collision detectors produces a collision signal when the signals presented at said collision detecting inlets are not substantially the same.
Claim 2
Dependent Claim
161 words
A transceiver multiplexor for receiving data signals from any one of a plurality of local data-generating stations (14) and transmitting them either to a communication medium (16) via a transceiver (20) coupled thereto or to any of the local stations, and comprising selectively-operable means (22) for transferring a data signal from any transmitting local station to the transceiver, collision detection means each having one inlet coupled to an outlet of a respective local station to receive a transmitted data signal therefrom, and having an other inlet coupled to receive transmitted data from said transfer means, the output of said collision detection means being representative of a collision whenever more than one of the local stations is transmitting a data signal, the output of each collision detector being coupled as an input to its respective local stations, whereby any one of the collision detectors produces a collision signal when the signals presented at said collision detecting inlets are not substantially the same.
Claim 3
Dependent Claim
33 words
The transceiver multiplexor of claim 1, wherein each of said collision detecting means includes a delay means (62) at said one input to roughly match the propagation delay through said transfer means (42).
Claim 4
Dependent Claim
61 words
The transceiver multiplexor of claim 1 or 2, wherein said collision detecting means comprises an exclusive OR means (64) connected to a suppressor means (66), adapted to eliminate short term outputs from said exclusive OR means up to a predetermined value and representative of small propagation delays of substantially identical data signals present at both inlets of said exclusive OR means.
Claim 5
Dependent Claim
18 words
The transceiver multiplexor of claim 4 wherein said suppressor means is a low pass RC filter (70, 72).
Claim 6
Dependent Claim
206 words
A local area network communication system including a transmission medium (16) and a plurality of transceivers (20) connected to said medium to transmit and receive data signals communicated over said medium, a transceiver multiplexor (22) coupled to said transceiver and to a plurality of local stations (14) and having means to receive transmitted data from any of said stations for transfer to said transceiver for transmission onto said medium and to receive transmitted data from said medium for transfer to any one of said stations, first collision detecting means in said transceiver for generating a first collision signal whenever a data signal communicated on said medium by another transceiver is received by the subject transceiver during the time said subject transceiver is transmitting a signal onto said medium, second collision detecting means in said multiplexor for generating a second collision signal whenever a data signal communicated by one of said local stations to said subject transceiver via said multiplexor is communicated during the time anotehr data signal is being communicated by another of said local stations, both of said collision signals being coupled to said local stations to interrupt the transmission of a data signal by any one of said local stations in the same cluster.
Claim 7
Dependent Claim
206 words
A local area network communication system including a transmission medium (16) and a plurality of transceivers (20) connected to said medium to transmit and receive data signals communicated over said medium, a transceiver multiplexor (22) coupled to said transceiver and to a plurality of local stations (14) and having means to receive transmitted data from any of said stations for transfer to said transceiver for transmission onto said medium and to receive transmitted data from said medium for transfer to any one of said stations, first collision detecting means in said transceiver for generating a first collision signal whenever a data signal communicated on said medium by another transceiver is received by the subject transceiver during the time said subject transceiver is transmitting a signal onto said medium, second collision detecting means in said multiplexor for generating a second collision signal whenever a data signal communicated by one of said local stations to said subject transceiver via said multiplexor is communicated during the time anotehr data signal is being communicated by another of said local stations, both of said collision signals being coupled to said local stations to interrupt the transmission of a data signal by any one of said local stations in the same cluster.
Claim 8
Dependent Claim
98 words
The local area network communication system of claim 5, wherein said second collision detecting means comprises a delay means connected to receive data being transmitted by a respective local station, signal generator means connected to receive at its inputs said data signal from said delay means and from said transfer means, said signal generator means productive of said second collision signal when the magnitude of the difference in the signals at said inlets is greater than the difference encountered at its inlets owing to propagation delays of a substantially identical data signal present at both of its inlets.
Claim 9
Dependent Claim
56 words
The local area network communication system of claim 6, wherein said signal generator means comprises an exclusive OR gate (64) connected to a low pass filter (66) for eliminating short-term outputs up to a predetermined value and representative of small propogation delays of substantially identical data signals present at both inlets of said exclusive OR gate.
Claim 10
Dependent Claim
20 words
The local area network communication system of claim 7, wherein said low pass filter is an RC network (70, 72).
References Cited (Backward Citations)
No citation records indexed.
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