Fiber Isolators for Nortel Meridian Systems
FiberPlex FOM-3940 Fiber Optic Multi-Port Module - 4 channels of Nortel Meridian Telephone; modular card style



The FOM-3941 and FOM-3942 are Multi-Port Fiber Extender and Isolator cards, fitting either Stand-Alone or 16-port rack chassis and designed for Nortel’s Meridian PBX systems.


Overview
The FOM-3941 and FOM-3942 both provide complete electrical isolation for Nortel’s Meridian™ M2000 and M3000 series digital telephones. The FOM-3941 connects to the digital line card and automatically senses and corrects any improper polarity reversals on the RJ-11. If the wiring to pins 3 and 4 are reversed, the module will swap the pair internally. The bidirectional signaling between the digital line card and telephone is then carried across a duplex fiber optic cable. The FOM-3942 reproduces the digital signaling at the isolated end of the fiber optic link and provides power (±15VDC @ 50mA ) sufficient to operate M2000 and M3000 series digital telephones.

The module can be used in areas of high electrical noise or in and out of RF shielded enclosures. The module enhances privacy of communications because fiber cannot be tapped without being detected and does not radiate any emissions. The fiber optic cable is not susceptible to interference caused by impulse noise, crosstalk, or EMI. The potential problem of creating ground loops or ground offsets is also eliminated because there is no conductive path through the glass fiber for ground.

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.

Applications
A typical link consists of an FOM-3941 at the PBX and an FOM-3942 at the telephone with a duplex fiber optic cable in between.

FOM-3940 applications


Features
  • Card Module for the FOM system supporting stand-alone or multi-card 19” rack mounting
  • Supports all system features on Nortel’s Meridian™ M2000 and M3000 series digital telephones
  • Supports balanced 2-wire signaling between PBX and digital telephone.
  • The FOM-3942 supplies ±15VDC @ 50mA to power digital telephones.
 
Ordering
# Model # Description Availability
1 FOM-3941-C 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, PBX side, SFP cage, no optical module Special Order
 
 Accessories
2 FOM-3941-L12 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, PBX side, Multimode LC optics Special Order
 
 Accessories
3 FOM-3941-L5B 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, PBX side, Singlemode LC optics Special Order
 
 Accessories
4 FOM-3941-T12 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, PBX side, Multimode ST optics Special Order
 
 Accessories
5 FOM-3941-T5B 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, PBX side, Singlemode ST optics Special Order
 
 Accessories
6 FOM-3942-C 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, Phone side (supplies power for 'S' type handsets), no optical module Special Order
 
 Accessories
7 FOM-3942-L12 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, Phone side (supplies power for 'S' type handsets), Multimode LC optics Special Order
 
 Accessories
8 FOM-3942-L5B 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, Phone side (supplies power for 'S' type handsets), Singlemode LC optics Special Order
 
 Accessories
9 FOM-3942-T12 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, PBX side, Multimode ST optics Special Order
 
 Accessories
10 FOM-3942-T5B 4 Channel Isolator for Nortel Meridian M2000 and M3000 series telephones, Phone side (supplies power for 'S' type handsets), Singlemode ST optics Special Order
 
 Accessories

 


 
 
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