Communications: electrical – Continuously variable indicating – With meter reading
Patent
1984-11-29
1986-12-30
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
370 16, 34082502, H04Q 900
Patent
active
046332464
ABSTRACT:
A Time Divison Multiplex Ring (TDM Ring) comprising a plurality of nodes (central offices) connected together by interchange trunks (main and standby paths) in a ring type configuration. Each node contains a multiplexer, a demultiplexer, data, alarm, bridging, switching circuits, transmitters and receivers on the main and standby paths, all arranged so that (a) data and alarm signals are transmitted in a first direction on the main path and in an opposite direction on the standby path, (b) the bridging circuit forms a transmission path between the transmitter and receiver on the standby path of each node only in response to a predetermined alarm signal originating from an alarm circuit in another node received at a given node on the main transmission path and (c) the switching circuit is responsive to the presence of a predetermined alarm status to switch the data and alarm circuits at each node from a connection where all transmission is on the main path to a connnection whereby such signals are transmitted at least in part over the standby path.
REFERENCES:
patent: 4159470 (1979-06-01), Strojny et al.
patent: 4446551 (1984-05-01), Seo
patent: 4519070 (1985-05-01), Bell
patent: 4530085 (1985-07-01), Hamada et al.
patent: 4538264 (1985-08-01), Bahr et al.
patent: 4542496 (1985-09-01), Takeyama et al.
Jones J. Richard
Mann Alan B.
Abernethy J. David
FiberLAN, Inc.
Moffitt Roy B.
Yusko Donald J.
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