FDDI connector utilizes two 2.5mm ferrules. The ferrules are sheltered from damage because of the fix shroud that has been constructed in the FDDI connector. FDDI connector is a duplex multimode connector designed by ANSI and is utilized in FDDI networks. FDDI connectors are generally used to connect to the equipment from a wall outlet, but the rest of the network will have ST or SC connectors.
ESCON connectors derive their name from their original application, IBM’s enterprise system connection (ESCON) for mainframe computers. ESCON connectors are similar to FDDI connectors, but contain a retractable shroud instead of a fixed shroud. ESCON connectors have two 2.55 mm ceramic ferrules and a robust strain relief design.
MU connector – simplex, duplex – snap in, 1.25mm ferrule.
MU connectors and adapters were developed by NTT, and have push-pull mechanism. They are called “mini SC” and are more popular in Japan. Applications include high-speed data communications, voice networks, telecommunications, and dense wavelength division multiplexing (DWDM). MU connectors are also used in multiple optical connections and as a self-retentive mechanism in backplane applications.
MU Connector – Simplex and Duplex
MU Adapter – Simplex MU Adapter – Duplex
E2000 connector. 1.25mm ferrule, snap-in mechanism. Available in single mode and multimode.
Externally a E2000 connector looks like a miniature SC connector. The connector is easy to install, with a push-pull latching mechanism which clicks when fully inserted.
It features a spring-loaded shutter which fully protects the ferrule from dust and scratches. The shutter closes automatically when the connector is disengaged, locking out impurities which could later lead to network failure, and locking in potentially harmful laser beams. When it is plugged into the adapter the shutter opens automatically.
MT-RJ connector, duplex only, available in singlemode and multimode (not 1.25mm ferrule, but rather a two-fiber ferrule design derived from MT). Overall size is about the same as a RJ45 connector.
MT-RJ connector is derived from MT ferrule design. It has a miniature two-fiber ferrule with two guide pins parallel to the fibers on the outside. The guides pins align ferrules precisely when mating two MT-RJ connectors. MT-RJ connectors are designed with male-female polarity which means male MT-RJ connector has two guide pins and female MT-RJ connector has two holes instead.
MT-RJ connectors are used in intrabuilding communication systems. Since they are designed as plugs and jacks, like RJ-45 telephone connectors, adapters can be used with some designs, but are not required for all.
http://www.fiberoptics4sale.com/page/FOFS/CTGY/Volition_Patch_Cords (3M Volition), duplex only. No ferrules at all. Plug and jack versions.
VF-45 (3M Volition) is designed by 3M. VF-45 features plug and jack design without the need of adapters. VF-45 plug is inserted into the socket(jack) at a 45 degree angle, pressing a pair of fibers into V-grooves inside the socket. This design eliminates the need for expensive ferrules thus reduces connector costs.
Opti-Jack connector. Duplex only. 2.5mm ferrule. Plug and jack version.
Opti-Jack connector is a version of Fiber Jack connector design from Panduit Corporation, that provides a snap-lock plug and socket for a pair of fiber cables. It enables fibers to be quickly plugged and removed in a manner similar to RJ-45 connectors. It is designed around two ST-type 2.5mm ferrules in a package the size of a RJ-45.
Fiber Jack is a duplex fiber-optic connector standardized by the TIA (FOCIS-6). TIA stands for Telecommunications Industry Association. Fiber Jack allows two fibers to mate in a snap-lock type of plug and socket similar in size and convenience to an RJ-45 connector.
Opti-Jack(Panduit name Opto-Jack, TIA name Fiber Jack) Connector and Adapter