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Comnet : FDC1S


  • One or two fiber loop units available
  • Instantaneously reports optical fiber breakage or damage locally or remotely
  • Dry relay contacts may be configured for NO or NC operation
  • Automatic resettable solid state current limiters for modem protection
  • Voltage transient protection on all power and signal input/output lines provides protection from power surges and other voltage transient events.
  • Ambient operating temperature range: -40° C to +75° C for deployment in virtually any unconditioned out-of-plant or roadside environment
  • Bi-color status indicating LEDs provide rapid indication of critical operating parameters
  • Plug-and-play design for ease of operation – no optical or electrical adjustments required
  • Hot-swappable rack modules
  • Interchangeable between stand-alone or rack mount use – ComFit
  • May be DIN-rail mounted by the addition of ComNet DIN-Rail adaptor plate (Model DINBKT1 or DINBKT4, sold separately)
  • Lifetime warranty

Product Description

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 single-mode 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. An LED status indicator is provided for a local indication of the optical path continuity. Packaged in the exclusive ComNet ComFit housing, these units may be either wall or rack-mounted, or may be DIN-rail mounted by the addition of ComNet model DINBKT1 adaptor plate. The dual-channel version contains two independent transmitter and receiver units in one compact package, and is ideal for continuously monitoring the optical status of two separate fiber loops. As these modems are industrially hardened and rated for operation from -40 to +75 degrees C, they may be deployed in virtually any unconditioned out-of-plant or roadside environment. Plug-and-play design ensures ease of operation, and no optical or electrical adjustments are ever required.

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