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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.
The jacket color (or connector boot color) on some cables may give you an indication. The link below gives reference to common fiber jacketing color codes. The switch/router port type may be of some use. A 1000Base-SX port is used with multimode fiber.However, it will not tell you whether the fiber core is 62.5 or 50 micron multimode fiber.Some fiber port types (or pluggable transceivers) will only work with singlemode fiber.orrect Answer by Tom Randstrom about 4 years 9 months ago. It can be difficult to identify fiber types for installed cable. This is the reason that it is critical for installers and technicians to maintain the network documentation. But, I am preaching to the chior with you because you are the one cleaning up the mess.