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However, the advent of metallic connectors like the FC and ST made color coding difficult, so colored boots were often used. The TIA 568 color code for connector bodies and/or boots is Beige for multimode fiber, Blue for singlemode fiber, and Green for APC (angled) connectors.
Singlemode fiber has a core diameter of approximately 9 microns and can accommodate signal transmission down a single path (mode) of light--hence the name, singlemode.. Multimode fiber gets its name from its ability to accommodate signal transmission down several modes of light.