Concentrator for local area network with loop topology

Details Concentrator for local area network with loop topology Concentrator for local area network with loop topology

1989-12-15

1991-07-23

O'Shea, Sandra L.

Communications: electrical

Continuously variable indicating

With meter reading

370 56, 370 8515, H04B 300

Patent

active

050347381

ABSTRACT:
A concentrator for a local area network with loop topology uses a connector to which a first workstation is connected and a relay contact for switching between a state in which second and third workstations positioned at both sides of the first workstation are connected to each other and another state in which the first workstation is connected via the connector between the second and the third workstations. The concentrator includes an activation member for activating the relay contact and a pair of condensers to be charged by direct current from the first workstation when the first workstation is connected. The activation member is operated by discharging the direct current. A controller controls the discharging of one of the pair of condensers by detecting the changes in connection conditions of the first workstation.

REFERENCES:
patent: 4078228 (1978-03-01), Miyazaki
patent: 4417242 (1983-11-01), Bapst et al.
patent: 4584518 (1986-04-01), Higashino et al.
patent: 4701630 (1987-10-01), Annunziata et al.
patent: 4733153 (1988-03-01), Katzenstein
patent: 4800532 (1989-01-01), Honeck et al.
patent: 4847611 (1989-07-01), Bekki et al.
patent: 4862158 (1989-08-01), Keller et al.

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