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Product Data Sheets (pdf)...Single-Mode Fiber Optic In-Line Attenuators

  • Pdf Drawing... 
  • HD Adapter Panel, with (8) Duplex MT-RJ Pairs, PDF Drawing
    PDF Drawing for the JPM416A-R2
  • Visio Stencil Drawing... 
  • Visio Stencil
    Stencil Drawings

Black Box Explains…OM3 and OM4.

There are different categories of graded-index multimode fiber optic cable. The ISO/IEC 11801 Ed 2.1:2009 standard specifies categories OM1, OM2, and OM3. The TIA/EIA recognizes OM1, OM2, OM3, and OM4.... more/see it nowThe TIA/EIA ratified OM4 in August 2009 (TIA/EIA 492-AAAD). The IEEE ratified OM4 (802.ba) in June 2010.

OM1 specifies 62.5-micron cable and OM2 specifies 50-micron cable. These are commonly used in premises applications supporting Ethernet rates of 10 Mbps to 1 Gbps. They are also typically used with LED transmitters. OM1 and OM2 cable are not suitable though for today's higher-speed networks.

OM3 and OM4 are both laser-optimized multimode fiber (LOMMF) and were developed to accommodate faster networks such as 10, 40, and 100 Gbps. Both are designed for use with 850-nm VCSELS (vertical-cavity surface-emitting lasers) and have aqua sheaths.

OM3 specifies an 850-nm laser-optimized 50-micron cable with a effective modal bandwidth (EMB) of 2000 MHz/km. It can support 10-Gbps link distances up to 300 meters. OM4 specifies a high-bandwidth 850-nm laser-optimized 50-micron cable an effective modal bandwidth of 4700 MHz/km. It can support 10-Gbps link distances of 550 meters. 100-Gbps distances are 100 meters and 150 meters, respectively. Both rival single-mode fiber in performance while being significantly less expensive to implement.

OM1 and 2 are made with a different process than OM3 and 4. Non-laser-optimized fiber cable is made with a small defect in the core, called an index depression. LED light sources are commonly used with these cables.

OM3 and 4 are manufactured without the center defect. As networks migrated to higher speeds, VCSELS became more commonly used rather than LEDs, which have a maximum modulation rate of 622 Mbps. Because of that, LEDs can’t be turned on and off fast enough to support higher-speed applications. VCSELS provided the speed, but unfortunately when used with older OM1 and 2 cables, required mode-conditioning launch cables. Thus manufacturers changed the production process to eliminate the center defect and enable OM3 and OM4 cables to be used directly with the VCSELS. OM3/OM4 Comparison
850 nm High Performance EMB (MHz/km)

OM3: 2000

OM4: 4700

850-nm Ethernet Distance
OM3: 1000 m

OM4: 1000 m

OM3: 300 m

OM4: 550 m

OM3: 100 m

OM4: 150 m

OM3: 100 m

OM4: 150 m


  • Manual... 
  • NEMA-4 Rated Fiber Optic Wallmount Enclosure (with 4 Adapter Panels) User Manual
    User Manual for the JPM4000A-R2 (Version 2)

Product Data Sheets (pdf)...Fiber Wall Cabinets, Panels, and Shelf

  • Manual... 
  • Wallmount Z-Hinged Fiber Enclosure User Manual
    User Manual for the JPM450A (Version 1)
  • Pdf Drawing... 
  • Fiber Wall Cabinet, Unloaded, Lock-Style 24-Port (Accepts 4 Adapter Panels) PDF Drawing
    PDF Drawing for the JPM402A-R2
  • Pdf Drawing... 
  • Rackmount Fiber Panel, 1U (Loaded with (24) Single-Mode/Multimode Connectors, LC, 24 Duplex) PDF Dra
    PDF Drawing for the JPM385A
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