Fiber Optics - Cabletron Systems 100BASE-FX Cabling Manual

Ethernet Media

Fiber Optics

As both multimode and single mode fiber optics use the same standard connector
in the Ethernet 10BASE-FL and FOIRL specifications, both cabling types are
treated in the section that follows. The recommended connector for 100BASE-FX
networks is discussed in the closing pages of this section.
NOTE
Straight-Tip
The 10BASE-FL standard and FOIRL specification for Ethernet networks define
one style of connector as being acceptable for both multimode and single mode
fiber optic cabling - the Straight-Tip or ST connector (note that ST connectors for
single mode and multimode fiber optics are different in construction and are not
to be used interchangeably). Designed by AT&T, the ST connector replaces the
earlier Sub-Miniature Assembly or SMA connector. The ST connector is a keyed,
locking connector that automatically aligns the center strands of the fiber optic
cabling with the transmission or reception points of the network or cable
management device it is connecting to.
4-28
The 10BASE-F specification is broken up into three main
categories; 10BASE-FP Passive Fiber Optic Star, 10BASE-FB
Active Fiber Optic Backbone, and 10BASE-FL Active Fiber
Optic Link. Cabletron Systems produces Ethernet products that
comply with the 10BASE-FL specification.
Side Elev.
Solid Glass
Center
Keyed
Connector
Figure 4-20. ST Connectors
Front Elev.
Hollow Center
Channel
P
Cladding
Key Guide
Channel
Locking Key
1845n20
Connector Types