Nortel Meridian M2000 and M3000 Series

Model #: FOI-3901 | FOI-3902

FOI-3901 | FOI-3902

The FOI-3901 and FOI-3902 both provide complete electrical isolation for Nortel’s Meridian™ M2000 and M3000 series digital telephones. The FOI- 3901 connects to the digital line card and automatically senses and corrects any improper polarity reversals on the RJ-11. The bidirectional signaling between the digital line card and telephone is then carried across a duplex fiber optic cable. The FOM-3902 reproduces the digital signaling at the isolated end of the fiber optic link and provides power sufficient to operate M2000 and M3000 series digital telephones. The FOI-3902 is compatible with Nortel’s A0367335 plug-in transformer, which provides power to support the additional features on the M2016S digital telephone. A closet power supply can also be used to provide auxiliary power but the power must be inserted between the FOI-3902 and the digital telephone.

The user can achieve complete electrical isolation for Nortel’s Meridian™ M2000 and M3000 series digital telephones in areas of high electrical noise or in/out of RF shielded enclosures (SCIF). The fiber optic cable is not susceptible to induced impulse noise and since signal ground is not carried over the link, the signal is not affected by elevated ground potential from lightning or other sources. The fiber optic cable enhances privacy of communications. In addition, fiber optic cable offers much longer transmission distance than traditional telephone line cord wiring. Nortel’s Meridian™ digital telephones are limited to a maximum distance of 1750 feet (458m) from the PBX to the telephone on 24 gauge wire, but multimode and singlemode optics on the module extend the distance to 2km. A typical link consists of an FOI-3901 at the PBX and an FOI-3902 at the telephone with a duplex fiber optic cable between them.

Flexible Mounting and Powering Options

The FOI-3901 and FOI-3902 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‐3909 AC supply or a PSQ‐3920 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.

  • Supports all system features on Nortel’s Meridian™ M2000 and M3000 series digital telephones
  • Supports balanced 2-wire signaling between PBX and digital telephone
  • FOI-3902 supplies ±15VDC @ 50mA to power digital telephones
  • FOI-3902 is compatible with Nortel’s A0367335 plug-in transformer.
ELECTRICAL SPECIFICATIONS
 
Min
Typ
Max
Power Requirement Voltage Range (V)
7
9
14
FOI-3901 Supply Current (mA)
-
350
-
FOI-3902 Supply Current (mA)
-
500
-
 
Data Rate 512 kbps
Line Encoding Balanced Differential AMI (Alternate Mark Inversion
Reciever Sensitivity 400 mVpk-pk (-15 dB loss
 
Environmental Storage Temperature (°C)
-40
-
85
OperatingTemperature (°C)
0
-
50
 
Interface Connector RJ-11
PHYSICAL SPECIFICATIONS
 
Length
Width
Height
Weight
Case Dimensions Size 3
5.75 in (146 mm)
1.453 in (37 mm)
3.188 in (81 mm)
2 lb (0.9 kg)
OPTICAL CHARACTERISTICS
Fiber
Size
Max Distance
Wavelength
Output Power
RX Sens Loss Budget
Multimode
62.5 / 125 μm
2 km (10Base) 300m (100Base)
820 nm
-18 dBm
-30 dBm 12 dB
Singlemode 9 /125 μm 20 km 1300 nm -15 dBm -32 dBm 17 dB
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Standalone Operation  
PSQ-3909  Standalone AC Power Supply
PSQ-3920 Standalone DC Power Supply
WMA-3002 Wall Mount Adapter
WMA-2001 Wall Mount Adapter with ST Optical Patch
Chassis Mounting  
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  
CMA-3002 Chassis Mount Adapter for RMC-3101 Chassis. (1) per FOI Module required
PSM-3010 Spare Power Supply for RMC-3101

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