Communications: electrical – Continuously variable indicating – With meter reading
Patent
1992-04-10
1994-06-14
O'Shea, Sandra L.
Communications: electrical
Continuously variable indicating
With meter reading
34082503, 34082516, 370 16, 371 81, 371 82, H04L 1250, H04J 1500, G06F 1120
Patent
active
053213939
ABSTRACT:
In a plurality of working interface circuits (12-19), each circuit has at least one transmitter (86) and at least one receiver (88). A spare interface circuit (35) has at least one transmitter (158) and at least one receiver (154). A switch circuit (21) is coupled to the working interface circuits (12-19) and the spare interface circuit (35) and includes a plurality of switches (110-117; 109; 122, 138, 130, 150) which are operable to create a selected one of at least two data paths. A first of these data paths may be selectively formed from a selected one of the working interface circuits (12-19) to the spare interface circuit (35) to monitor the operation of the selected one of the working interface circuits (12-19) without affecting any communications signal transmitted by that working interface circuit. Another data path may be selectively established from a malfunctioning one of the working interface circuits (12-19) to the spare interface circuit (35). For substituting at least a portion of the spare interface circuit (35) for a like portion of malfunctioning one of the working interface circuits (12-19). In a preferred embodiment, a third data path may be selectively established from the spare interface circuit, through the switch circuit and back to the spare interface circuit to monitor the operation of the spare circuit (21).
REFERENCES:
patent: 3694775 (1972-09-01), Rogers
patent: 4451708 (1984-05-01), Kemler et al.
patent: 4517572 (1985-05-01), Dixon
patent: 4774703 (1988-09-01), Force et al.
patent: 5229990 (1993-07-01), Teraslinna
GTE Automatic Electric Journal, "No. 2 EAX, 2A to 2B Processor Conversion", pp. 164-168, Sep.-Oct. 1981, Donato et al.
Carlton Stephen C.
Elias Paul A.
Alcatel Network Systems, Inc.
O'Shea Sandra L.
Rinehart Mark H.
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