Access unit for local area network and concentrator system there

Details Access unit for local area network and concentrator system there Access unit for local area network and concentrator system there

1994-09-15

1997-04-08

Chin, Wellington

Multiplex communications

Pathfinding or routing

Through a circuit switch

34089505, 333105, H04L 1242, H04L 1240

Patent

active

056194943

ABSTRACT:
The single port of a concentrator is branched into a plurality of ports by connecting a connector for the former-stage connector to the port of the concentrator and connecting the former-stage connector of the same structure in the other access unit to the connector for the latter-stage circuit to thereby cascade a plurality of access units. The LAN is expanded by connecting the workstation to the port connector of each of the cascaded access units. The thus, connected workstations provide an overlap signal of an AC signal and a DC signal. DC signal extraction circuit in the access unit extracts the DC signal from the overlap signal. A relay drive circuit is operated by the DC signal so that a relay is switched to the port connector side and the circuit is then connected to the workstation.

REFERENCES:
patent: 3581010 (1971-05-01), Kobayashi et al.
patent: 4417242 (1983-11-01), Bapst et al.
patent: 4701630 (1987-10-01), Annunziata et al.
patent: 4733153 (1988-03-01), Katzenstein
patent: 4862158 (1989-08-01), Keller et al.
patent: 4935926 (1990-06-01), Herman
patent: 5034738 (1991-07-01), Ishihara et al.
patent: 5101405 (1992-03-01), Bekki et al.
patent: 5179291 (1993-01-01), Nishikawa et al.

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