--- title: WHAT touching fiber really does | daily.dev description: A live demonstration showing what happens when you touch fiber optic connector tips with your fingers. Even dry hands leave enough oil to transfer... canonical: https://daily.dev/posts/what-touching-fiber-really-does-j4qb3yoi5 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: WHAT touching fiber really does | daily.dev og:description: A live demonstration showing what happens when you touch fiber optic connector tips with your fingers. Even dry hands leave enough oil to transfer... og:url: https://daily.dev/posts/what-touching-fiber-really-does-j4qb3yoi5 og:image: https://api.daily.dev/og/posts/J4QB3Yoi5.png og:image:alt: WHAT touching fiber really does og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # WHAT touching fiber really does **[David Bombal](https://daily.dev/sources/davidbombal)** · 2 min read · 0 upvotes · 0 comments ## Summary A live demonstration showing what happens when you touch fiber optic connector tips with your fingers. Even dry hands leave enough oil to transfer contamination between connectors, causing a 'coffee cup stain' effect that leads to frame errors on SFP/QSFP ports. The demo shows how dirt spreads from a dirty connector to a previously clean one, and covers proper cleaning technique using a click cleaner tool rather than a shirt, followed by visual inspection to confirm cleanliness. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Ethernet will tolerate your mistakes, but fiber optic cabling absolutely won't](https://daily.dev/posts/ethernet-will-tolerate-your-mistakes-but-fiber-optic-cabling-absolutely-won-t-jcf88hh2c) · XDA Developers · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/what-touching-fiber-really-does-j4qb3yoi5) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"WHAT touching fiber really does","url":"https://daily.dev/posts/what-touching-fiber-really-does-j4qb3yoi5","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/what-touching-fiber-really-does-j4qb3yoi5"},"datePublished":"2026-06-11T18:29:11.171Z","dateModified":"2026-06-11T18:29:26.941Z","description":"A live demonstration showing what happens when you touch fiber optic connector tips with your fingers. 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