Communications: electrical – Continuously variable indicating – With meter reading
Patent
1992-10-01
1994-02-01
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
340825170, 371 112, 370 92, H04Q 900
Patent
active
052835715
ABSTRACT:
An apparatus to detect stations having duplicated addresses, the stations of the type connected in a computer communications network, the stations of the type capable of having an assigned address and having a list of addresses for comparison with a destination address field of a frame detected on the network is disclosed. The apparatus does a transmit self test, and sets a self indicator to "pass" in the event that the self test frame is received, and sets the self indicator to "timeout" in the event that a timeout occurs. The apparatus does a neighbor response test, and sets a neighbor indicator to "timeout" in the event that a timeout occurs, and sets the neighbor indicator to "pass" in the event that a received response frame indicates no destination address match, and sets the neighbor indicator to "fail" in the event that a received response frame indicates that a destination address match did occur. The apparatus tests both the self indicator and the neighbor indicator, and in response to the testing of the self indicator and the testing of the neighbor indicator sets a duplicate address indicator in one of three states, a first state of the three states indicating that there is no duplicate address detected, a second state of the three states indicating that there is a duplicate address, and the third state of the three states indicating an unknown condition.
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Hawe William R.
Hutchison Jerry
Koning G. Paul
Yang Henry
Cefalo Albert P.
Digital Equipment Corporation
Holloway III Edwin C.
Johnston A. Sidney
Young Barry N.
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