Patent ID: 7693080

Claim:
A network monitor configured to couple with a wire pair configured in a loop, the wire pair having a contact therein movable between a closed position and an open position, the network monitor comprising: a first port having: a first termination coupled with the wire pair on one side of the contact, a first transceiver chip coupled with the first termination and configured to convert signals sent over the wire pair from RS-485 voltage levels to standard levels, first isolator coupled with the first transceiver chip; a second port having: a second termination coupled with the wire pair on an opposite side of the contact, a second transceiver chip coupled with the second termination and configured to convert signals sent over the wire pair from RS-485 voltage levels to standard levels; a second isolator coupled with the second transceiver chip; a router coupled with the first port via the first isolator and coupled with the second port via the second isolator; a microcontroller coupled with the router, the first termination and the second termination; a third port configured to be coupled with a fire detector panel, the third port having: a third isolator coupled with the router, a third RS-485 transceiver chip coupled with the third isolator, and termination jumpers coupled with the third transceiver chip, wherein the network monitor is configured to initiate one of a healing operation and a disconnect operation if an error ratio between good data detected by at least one counter and detected bad data detected by the at least one counter exceeds a preset limit.