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  • Fiber optic phone adapter providing secure transmission of telephone conversation over fiber optic link for up to 50 km (31 miles)
  • Supports single mode and multimode fibers
  • Available with laser diode option for extended ranges
  • Supports both DTMF and pulse dialing
  • Receives power from AC, DC power supply or on-board nickel-cadmium rechargeable battery
  • Available in two versions:
    • Subscriber unit compatible with any standard telephone set
    • PBX unit for direct connection to PBX


  • F-TEL, fiber optic telephone adapter, provides direct, secure fiber optic connection between any telephone set and a PBX, or between two telephone sets.
  • F-TEL converts the electrical signals into optical signals. Two in-line units are required to complete a fiber link: a PBX unit (F-TEL/CO) for the PBX side and a subscriber unit (F-TEL/SUB) for the subscriber telephone set.
  • F-TEL operates in two typical configurations:
    • Telephone-to-PBX optical connection (subscriber to PBX)
    • Telephone-to-telephone optical connection (subscriber to subscriber).
  • F-TEL is designed to operate with several grades and sizes of fiber optic cable. Use of fiber optic cabling provides immunity to electrical interference such as EMI and RFI.
  • Three optical interfaces are available:
    • 850 nm wavelength for multimode fiber
    • 1300 nm wavelength for single mode fiber
    • Laser diode (1300 nm) for single mode fiber with extended operating range.
  • The laser diode has an internal temperature control circuit to compensate for ambient temperature changes.
  • F-TEL/SUB supports 20 Hz or 25 Hz ringing, as well as DTMF and pulse dialing to meet requirements of national carriers.
  • As a backup to the standard AC or DC power supply, F-TEL can be powered via an external 9-12 VDC power supply or by an on-board nickel-cadmium rechargeable battery.
  • LED status indicators are available on the front panel of both units for indicating the system status