POTS (Plain Old Telephone Service) Fiber converter

Model #: FOI-2971 | FOI-4972

FOI-2971 | FOI-4972

The FOI-2971 and FOI-4972 provide complete electrical isolation for 2-wire telephone communications. The FOI-4972 supports standard analog phones, STU-III (secure telephone unit) phones, STE (secure telephone equipment) phones, fax machines, and modems and supports Caller ID.

The units can be used in areas of high electrical noise or in and out of RF shielded enclosures. The fiber optic cable is not susceptible to interference caused by impulse noise, crosstalk, or EMI. Privacy of communications is also enhanced because the fiber optic cable does not radiate any emissions. FiberPlex recommends “R” units for high security applications because the units have added filtering and shielding for RFI suppression.

In addition, fiber optic cable offers much longer transmission distances than traditional telephone line cord wiring. Multimode optics on the units can extend the distance to 2km, while singlemode optics can further extend the distance to 20km. A typical link consists of an FOI-2971 connected to the POTS line and an FOI-4972 at the subscriber’s phone with a duplex fiber optic cable between them.

Flexible Mounting and Powering Options

The FOI-2971 and FOI-4972 are part of the FOI line of products designed for ruggedized mil applications. They are housed in the familiar FOI shielded can enclosure. For standalone applications they can be powered by adding a PSQ‐4909 AC supply or a PSQ‐4920 DC power supply (not included). Optionally, up to 8 FOI units can be mounted on CMA chassis adapters and installed in an RMC‐3101 or RMC‐2101 rack mount chassis. The units are powered redundantly by a common back plane connection.

Typical Applications Include:

  • Standard POTS Telephones
  • STU-III and STE Phones
  • Fax Machines
  • Modems

FOI-4972 has solid state relays on the outer black and yellow pair which can be used to activate external signaling devices when ringing is detected

Two FOI-4972 can be connected back to back to create a private line automatic ringdown circuit.

ELECTRICAL SPECIFICATIONS
 
Min
Typ
Max
Power Requirement Voltage Range (V)
7
9
12
Supply Current (mA)
-
525
-
 
Audio Input Level (dBm)
-
-
5
Load Impedance (Ω)
-
600
-
Frequency Response (±3 dB) (Hz)
200
-
8k
 
Solid State Relay Load Voltage (V)
-
-
350
Load Current AC/DC (mA)
-
-
120
Load Current DC (mA)
-
-
200
On Resistance AC/DC (Ω)
23
-
35
On Resistance DC (Ω)
7
-
10
 
Environmental Storage Temperature (°C)
-40
-
85
OperatingTemperature (°C)
0
-
50
 
Interface Connector RJ-11
PHYSICAL SPECIFICATIONS - FOI-2971
 
Length
Width
Height
Weight
Case Dimensions Size 2
4.5 in (114 mm)
1.312 in (33 mm)
2.562 in (65 mm)
2 lb (0.9 kg)
PHYSICAL SPECIFICATIONS - FOI-4972
 
Length
Width
Height
Weight
Case Dimensions Size 4
4.5 in (114 mm)
1.453 in (37 mm)
2.562 in (65 mm)
2 lb (0.9 kg)
OPTICAL CHARACTERISTICS - All
Fiber
Size
Max Distance
Wavelength
Output Power
RX Sens Loss Budget
Multimode
62.5 / 125 μm
2 km
820 nm
-18 dBm
-30 dBm 12 dB
Singlemode 9 /125 μm 20 km 1300 nm -15 dBm -32 dBm 17 dB
oi_FOI-2971.png.
Standalone Operation  
PSQ-4909  Standalone AC Power Supply
PSQ-4920 Standalone DC Power Supply
WMA-3002 Wall Mount Adapter
WMA-2001 Wall Mount Adapter with ST Optical Patch
Chassis Mounting  
RMC-2101 2U, 19" Rack Mount Chassis. Holds up to 9 FOI Modules
CMA-2001 Chassis Mount Adapter for RMC-2101 Chassis. (1) per FOI Module required
PSM-2010 Spare Power Supply for RMC-2101
RP2 16 Channel Modular Bolt-On Connector Panel for RMC-2101
  
RMC-3101 3U, 19" Rack Mount Chassis. Holds up to 9 FOI Modules
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101
Industrial Solutions
RMC-3700  Environmental Enclosure for FOI Modules
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101

How to Buy

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