Multiplex communications – Wide area network – Packet switching
Patent
1989-06-16
1989-12-26
Orsino, Joseph A.
Multiplex communications
Wide area network
Packet switching
178 2R, 36457105, H04J 116
Patent
active
048902780
ABSTRACT:
Apparatus and method are disclosed for providing a calibrated measurement of signals applied to a local area network cable segment. A remote segment monitor unit has the signal sampling circuit coupled to a signal generating unit. The signal generating unit is controlled by a network system member (node) and applies a series of known signal levels to the signal sampling circuit of the remote segment monitor unit. The known signal levels from the signal generating unit and the signal levels measured by the remote segment monitor as a result of the known signal levels are compared and an appropriate scale factor entered in the processing circuit of the remote segment monitor. Using the calibrated remote segment monitor, the location of network nodes can be identified from the signal levels measured by the remote segment monitor. From the signals transmitted by cable segment, signal levels of transaction signals applied to the cable segment by the system nodes can be determined and marginal conditions can be identified prior to an actual failure of a system node.
REFERENCES:
patent: 4669052 (1987-05-01), Bianco
patent: 4712106 (1987-12-01), McNally
Felker Michael A.
Gilstrap John W.
Martos Jesus J.
Trujillo Ruben
Viverito Angelo N.
Digital Equipment Corporation
Holloway William W.
Orsino Joseph A.
Pledger T. Carter
Scutch III Frank M.
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