Patent ID: 8144736
Filing Date: 2012-03-27
Classification: H04J

Abstract:
1. A fire alarm network fiber optic multiplex modem, comprising: plural local interfaces, a digital interface of the plural local interfaces configured to receive digital data and an analog interface of the plural local interfaces configured to receive analog data, wherein the digital interface is configured to receive a signal that is unsynchronized with the fiber optic multiplex modem and wherein the signal is oversampled at plural intervals within a frame cycle, both the digital data and the analog data comprising audio; a fiber optic interface; a multiplexor which combines the digital data and the analog data received at the local interfaces into an outgoing data stream, wherein at least one digital value is placed in the outgoing data stream based on the oversampled signal; a fiber optic modem which transmits the outgoing data stream to the fiber optic interface and which receives an incoming data stream via the fiber optic interface; and a demultiplexor which separates the incoming data stream into separate data streams, and which forwards each of said separate data streams to a corresponding local interface.