EP0383291A1
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EP
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Transmission failure diagnosis apparatus
Assignee: Furukawa Electric Co Ltd
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Filing: 1990-02-14
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Granted: —
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Expires: 2010-02-14
Abstract
Abstract There is disclosed a transmission failure diagnosis apparatus for use in a multiplex transmission system which sends and receives data by time division communication among a plurality of nodes connected by a common transmission path (1). The diagnosis apparatus comprises a reception circuit (21), connected in the transmission path, for receiving a transmission signal on the transmission path, an amplitude detection circuit (22) for detecting the signal amplitude of a transmission signal received by the reception circuit, and a judgment circuit (23) for judging failures in the system on the basis of the amplitude of the transmission signal detected by the amplitude detection circuit.
Inventors
- 👤 Toshimich Tokunaga
- 👤 Hiroo Moriue
- 👤 Yusaku Himono
- 👤 Osamu Michihira
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/1607; H04L1/1614; H04B; H04B17/00; H04J; H04J3/00; H04J3/02; H04J3/14; H04L12/00; H04L12/28; H04L12/40; H04L12/40006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
98 words
A failure diagnosis apparatus for use in a multiplex transmission system which sends and receives data by time division multiplex communication among a plurality of nodes connected by a common transmission path, comprising: reception means connected to said transmission path for receiving a transmission signal on the transmission path; and amplitude detection means for detecting the signal amplitude of the transmission signal received by the reception means; said apparatus characterized by further comprising judgment means for judging a failure in the system on the basis of the amplitude of the transmission signal detected by the amplitude detection means.
Claim 2
Dependent Claim
98 words
A failure diagnosis apparatus for use in a multiplex transmission system which sends and receives data by time division multiplex communication among a plurality of nodes connected by a common transmission path, comprising: reception means connected to said transmission path for receiving a transmission signal on the transmission path; and amplitude detection means for detecting the signal amplitude of the transmission signal received by the reception means; said apparatus characterized by further comprising judgment means for judging a failure in the system on the basis of the amplitude of the transmission signal detected by the amplitude detection means.
Claim 3
Dependent Claim
23 words
A failure diagnosis apparatus according to claim 1, wherein said transmission signal contains an identifier for identifying the node of a transmission origination.
Claim 4
Dependent Claim
42 words
A failure diagnosis apparatus according to claim 2, wherein said common transmission path is made up of a pair of signal lines and said transmission signal is represented by a first and a second differential signal between said pair of signal lines.
Claim 5
Dependent Claim
39 words
A failure diagnosis apparatus according to claim 1, wherein said judgment means includes means for comparing the amplitude of a transmission signal detected by the amplitude detection means with that of the transmission signal during an error free time.
Claim 6
Dependent Claim
105 words
A failure diagnosis apparatus according to claim 3, wherein said reception means includes a first reception circuit for receiving said first and second differential signals separately from each other and outputting the received signal to said amplitude detection means and a second reception circuit for receiving said first and second differential signals in a differential input format and outputting the received signal data to said judgment means, said judgment means including means for determining a faulty node on the basis of said identifier in the received signal data from the reception means and the amplitude of the received transmission signals from said amplitude detection means.
Claim 7
Dependent Claim
139 words
A failure diagnosis apparatus according to claim 3, wherein in one frame of a transmission signal sent and received among nodes in the multiplex transmission system there is defined an ACKNOWLEDGE bit field with the number of bits corresponding to the number of all nodes, and each bit position in the bit field is assigned to the respective node, wherein it is agreed that each node sends out an ACKNOWLEDGE bit at the respective bit position which is assigned to itself if the transmission signal which it has received is normal, and wherein this diagnosis apparatus is included in one specific node in the multiplex transmission system and said judgment means of this diagnosis apparatus determines a faulty node on the basis of the amplitude of a transmission signal corresponding to each ACKNOWLEDGE bit in the ACKNOWLEDGE bit field.
Claim 8
Dependent Claim
76 words
A failure diagnosis apparatus according to claim 3, wherein said reception means includes a circuit for receiving said first and second differential signals separately from each other and outputting the received differential signals to said amplitude detection means, said amplitude detection circuit including a circuit for sampling the peak value of an output signal from the above-mentioned circuit and converting this peak value to a digital value and outputting said digital value to said judgment means.
Claim 9
Dependent Claim
23 words
A failure diagnosis apparatus according to claim 1, wherein this diagnosis apparatus is contained in one specific node in this multiplex transmission system.
References Cited (Backward Citations)
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