Trunk cable fault detection and reconfiguration arrangement in a

Details Trunk cable fault detection and reconfiguration arrangement in a Trunk cable fault detection and reconfiguration arrangement in a

1991-09-03

1994-01-25

Dwyer, James L.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Including fault responsive disconnection of tested component

370 8512, 370 8515, H04M 308

Patent

active

052822370

ABSTRACT:
A ring communications network having a plurality of line concentrators (10) each including a ring-in port (16), a ring-out port (18), and a plurality of station ports (20), includes the feature of being able to detect a fault in the trunk cable between concentrators and reconfiguring the ring to bypass that fault. Fault detection is accomplished by injecting a phantom DC voltage at the ring-out port and sensing whether current due to that voltage is present at both the ring-out port and the ring-in port of the next adjacent concentrator in the ring.

REFERENCES:
patent: 4899142 (1990-02-01), Nakayashiki et al.
patent: 4964120 (1990-10-01), Mostashari
patent: 5081452 (1992-01-01), Cozic
patent: 5132832 (1992-07-01), Matz et al.
patent: 5199026 (1993-03-01), Lund
ANSI/IEEE Std 802.5-1985 pp. 77-80.

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