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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.
Multi-mode optical fiber - Comparison with single-mode fiber. 1  The main difference between multi-mode and single-mode optical fiber is that the former has much larger core diameter, typically 50â100 micrometers; much larger than the wavelength of the light carried in it.