Скачать или смотреть Stop Staring... Use THIS Phone Trick to Test Fiber!

Is that fiber-optic link really lit? In this quick networking tutorial I show two eye-safe methods to test any single-mode or multi-mode fiber patch lead, no expensive meter required. First, aim your smartphone camera at the connector; most phone sensors detect the otherwise invisible 850–1550 nm IR signal coming from our 10 Gb Cisco switch. Next, I attach a visible-red VFL (visual fault locator) so you can see the difference between infrared and test laser light. Along the way you’ll learn why only one strand glows (Tx vs. Rx), why staring down fiber can permanently damage eyesight, and how to apply this trick in data-center or home-lab environments. Perfect for CCNA/CCNP students, IT support, fiber splicers, smart-home builders, and anyone working with high-speed internet links. Never trust your eyes, use your phone or a proper power meter instead!

#fiber #fiberoptics #laser