The Whitaker Corporation

Thomas A Donnelly

Bret Allen Matz

K C Babu

Michael S Cohen

Kumar K R Hemant

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.

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Harrisburg, PA, United States of America

Thomas A Donnelly