Cabletron Systems 100BASE-FX, Cabling Manual

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Token Ring Media
9-18 Connector Types
The male ST connector is inserted into the channel of the female connector, its
guide channels aligned with the locking pins of the female connector. Once the ST
connector has been properly aligned, it is pressed in and rotated clockwise, the
locking pins and guide channels pulling the ST connectors together. Once the
locking pins have reached the ends of the guide channels, the ST connector locks
into position.
The locking mechanism of the ST connector assures proper alignment of the fiber
optic strands within the cable and the fiber optic receptors or transmitters in the
networking hardware. The locking mechanism also helps to eliminate excess
pressure or stress on the connection that may be caused by over-torquing a
threaded connector.