Patent ID: 9013980
Filing Date: 2015-04-21
Classification: G01R,H04L

Abstract:
1. A signaling circuit for providing communication over a compromised communication channel in a system having a first node and a second node connected via the communication channel, the signaling circuit comprising: wherein the first node comprises a fire alarm control panel and the second node comprises fire safety equipment; a master signal processor of a ground fault detection system, the master signal processor arrangement electrically connected to first and second portions of the communication channel, the first and second portions of the communication channel being employed in the first node, wherein the first and second portions of the communication channel comprise first and second coupling transformers, respectively, in the first node, the master signal processor arrangement being outside of the first node and the second node and being electrically connected to the first and second coupling transformers; a slave signal processor of the ground fault detection system, the slave signal processor arrangement coupled to the master signal processor arrangement and electrically connected to third and fourth portions of the communication channel, the third and fourth portions of the communication channel being employed in the second node; wherein the master signal processor and slave signal processor are configured to communicate a fire alarm as a fail-safe when the communication channel is compromised due to a detected ground fault.