ComNet Single Channel Fiber Break Detector

The ComNet FDC1 single-channel and FDC2 dual-channel modems are designed to detect and report a breakage or the loss of optical signal in either multimode or singlemode fiber plants. Featuring a self-contained transmitter and receiver, these units provide an optical output that is transmitted continuously through a customer-furnished fiber loop, where it returns to the internal receiver section. Should the optical path be lost through a deliberate or unintentional breakage of the fiber, relay contacts in the modem immediately change their state and report the loss of optical signal. These contacts are user-configurable as either normally open (NO) or normally closed (NC), and may be utilized for either a local or remote indication of cable plant tampering, damage, or failure. The dual-channel version contains two independent transmitter and receiver units in one compact packag, and is ideal for continuously monitoring the optical status of two separate fiber loops.

• May be DIN-rail mounted by the addition of ComNet DIN-Rail adaptor plate (Model DINBKT1 or DINBKT4, sold separately)


• Interchangeable between stand-alone or rack mount use ComFit


• Plug-and-play design for ease of operation - no optical or electrical adjustments requiredHot-swappable rack modules


• Bi-color status indicating LEDs provide rapid indication of critical operating parameters


• Ambient operating temperature range: -40° C to +75° C for deployment in virtually any unconditioned out-of-plant or roadside environment


• Voltage transient protection on all power and signal input/ output lines provides protection from power surges and other voltage transient events.


• Automatic resettable solid state current limiters for modem protection


• Dry relay contacts may be configured for NO or NC operation


• Instantaneously reports optical fiber breakage or damage locally or remotely


• One or two fiber loop units available