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
Description
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
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