Communications: electrical – Continuously variable indicating – With meter reading
Patent
1988-05-06
1990-02-20
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
370 857, 307115, 307112, H04L 1116
Patent
active
049030159
ABSTRACT:
In a communication device with a star circuit all electrical bus connections are terminated by their characteristic impedance at the side of the stations as well as at the side of a star circuit. In order to enable arbitrary connection/disconnection of stations without modification of the terminating impedances while at the same time the termination remains optimum, each bus connection is provided with a separating element. This element receives an active bus connection state and communicates this state to all other connections so that the local bus connections are also activated. However, when a bus applied to the relevant separating element so that the latter cannot signal a further activation. Furthermore, for each connection there is provided a logic circuit in order to prevent the signalling of the own activation back to the own bus connection, while the inhibit signal for the own bus connection need not be active either.
REFERENCES:
patent: 3337992 (1967-08-01), Tolson
patent: 4531238 (1985-07-01), Rawson et al.
patent: 4701630 (1987-10-01), Annunziata et al.
patent: 4716408 (1987-12-01), O'Conner et al.
patent: 4775864 (1988-10-01), Herman
Berkhoff Egbertus J.
Van Steenbrugge Bernard
Barschall Anne E.
Briody Thomas A.
Haken Jack E.
Pudpud E. O.
U.S. Philips Corporation
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