F-TEL fiber optic telephone adapter from RAD
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.
RAD 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.
F-TEL Fiber Optic phone adapter product data
sheet (pdf)
