Communications: electrical – Continuously variable indicating – With meter reading
Patent
1985-08-26
1987-11-10
Weldon, Ulysses
Communications: electrical
Continuously variable indicating
With meter reading
34082503, 34082552, 370 88, 370 94, G08B 500, H04Q 500, H04J 324
Patent
active
047060808
ABSTRACT:
A process is disclosed for effecting transmission over a generally cyclic communication system comprising numerous networks interconnected by gateway pairs. Each gateway of each pair implements a store-and-forward protocol whereby each gateway forwards message packets propagated over its associated network except for any packets that are destined for a device which has previously appeared in the sending address of another packet. In order to utilize this protocol as a basis for transmission, the system is covered with a set of spanning trees that satisfy capacity and reliability requirement. Each spanning tree is assigned a unique identifier and each packet traversing the system is assigned to and conveys the specified spanning tree. Each gateway passes the packet to determine the assigned spanning tree and forwards the packet accordingly. To mitigate system flooding by a newly connected device, the protocol may also incorporate a delay to allow the gateways to learn the location of the new device.
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Bell Communications Research Inc.
Falk James W.
Peoples John T.
Smith Ralph E.
Weldon Ulysses
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