You can identify a fiber optic cable model by reading the printed legend on the jacket, checking color codes, and noting physical and connector characteristics.

Step 1: Examine the Cable Jacket

Most fiber optic cables have manufacturer information printed along the jacket, including the cable model, fiber count, type, and performance specifications. For example, a marking like SR-5B9MR-864 indicates a specific Corning SST UltraRibbon Gel-Free Cable with 864 fibers, single-mode, and low water peak fiber, while additional markings may show the date of manufacture, diameter, weight, minimum bend radius, and maximum pulling tension .

Step 2: Check Fiber Type and Count

• Single-mode fibers (SM) are usually yellow, while multi-mode fibers (OM1 & OM2) are orange or gray, OM3 & OM4 are aqua, and OM5 is lime green .
• The print legend often includes abbreviations like SM (9/125) for single-mode or MMF (50/125) for multimode, indicating core and cladding diameters .
• Fiber count is typically printed as a number, e.g., 864F means 864 fibers .

Step 3: Inspect Connectors

The type of connector can provide clues about the cable's intended use:

• LC – small form-factor connector
• SC – square connector
• ST – round, bayonet-type
• FC – ferrule connector, common in telecom
• MTP/MPO – multi-fiber high-density applications

Step 4: Physical Inspection

• Measure the cable diameter and buffer coating if visible.
• Note the jacket color and any distance markings along the cable, which can indicate the length and help track usage .
• Check for special symbols like a phone handset graphic, which may denote a telecom-specific cable .

Step 5: Use Manufacturer Resources

If the print legend is unclear, consult the manufacturer's datasheet or website. Many manufacturers provide detailed decoding of their cable model numbers and specifications .

Step 6: Optional Testing

For confirmation, you can use testing tools:

• Visible light source to check continuity
• Power meter and light source to measure attenuation
• Optical Time Domain Reflectometer (OTDR) to verify fiber type and length By combining visual inspection, print legend decoding, color coding, and optional testing, you can accurately determine the model and specifications of a telecommunications fiber optic cable.