# fiber Published articles for fiber. This is one page of public article previews, not the complete archive. Follow Next page to continue. Summaries are not the original full articles. ## Multi-Core Fiber: Several Optical Cores Inside One Strand DevFeed: [Multi-Core Fiber: Several Optical Cores Inside One Strand]() Original publisher: [Read original article]() Author: j2sw Published: 2026-08-18T13:39:00Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [Hardware](), [Networks](), [interface]() Tags: [400g](), [cabling](), [channel](), [connectors](), [data-center](), [fiber](), [fiber-optics](), [internet-architecture](), [multi-core-fiber](), [network-engineering-resources](), [networks](), [optical-networking](), [optics](), [space-division-multiplexing](), [transmission]() ### AI overview This article explains how multi-core fiber places several optical cores inside one standard 125-micron cladding. It distinguishes MCF from high-fiber-count cable, describes aggregate capacity using separate channels and space-division multiplexing, and explains the need for specialized optical interfaces, connectors, splicing, and testing. ### Source excerpt Multi-core fiber places several independent optical cores inside one standard 125-micron cladding. It increases channel density, but it also requires different connectors, splicing methods, and testing procedures. The post Multi-Core Fiber: Several Optical Cores Inside One Strand appeared first on Justin Wilson (j2sw). ## Packets Down Range #42:Verizon, H5 tour, China ROAs DevFeed: [Packets Down Range #42:Verizon, H5 tour, China ROAs]() Original publisher: [Read original article]() Author: j2sw Published: 2026-08-14T16:12:36Z Content type: news Language: en Sources: [Justin Wilson (j2sw)]() Topics: [datacenter](), [networking](), [Routing Security](), [.env]() Tags: [bead](), [bgp](), [broadband](), [china](), [data-center](), [fiber](), [internet2](), [isp](), [news](), [packets-down-newsletter](), [packets-down-range](), [peering](), [roa](), [routing-security](), [terminal](), [verizon]() ### AI overview This English news roundup covers interconnection and data center topics, including H5's 325 Hudson, the value of peering beyond transit-cost savings, OpenAI's reported plan, routing visibility for Internet2 traffic, broadband developments in Texas and Indiana, Verizon fiber expansion, China's use of ROAS, and related tools and sites. ### Source excerpt Rain Rain Rain. Indiana has been rained on this week. Things are flooded but the Internet still works! So fire up your terminal, and let's head down range. Patreon Subscribers can view additional news here. It's only $3 a month. It's like buying me a Red Bull once a month. Interconnection & Data Center News-Inside ... Read more The post Packets Down Range #42:Verizon, H5 tour, China ROAs appeared first on Justin Wilson (j2sw). ## Multi-Core Fiber and How It Is Used in Data Centers DevFeed: [Multi-Core Fiber and How It Is Used in Data Centers]() Original publisher: [Read original article]() Author: j2sw Published: 2026-08-12T14:27:20Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [data centers](), [datacenter]() Tags: [400g](), [cabling](), [connectors](), [data-center](), [data-centers](), [fiber](), [fiber-optics](), [it-operations](), [mpo](), [mtp](), [multi-core-fiber](), [network-engineering-resources](), [optics](), [panel](), [parallel](), [single-mode](), [structured-cabling]() ### AI overview This article explains how "multi-core fiber" is used in data center discussions, distinguishing multi-fiber or high-fiber-count cables from true multicore fiber. It covers cable construction, fiber counts, single-mode and multimode options, and MPO and MTP connectors. ### Source excerpt If you work around data centers and high-density builds, you have probably heard the term "Multi-Core Fiber" thrown around. People use it in a few different ways. Sometimes, it means a new fiber trunk that comes into a cabinet as a single cable and breaks out into dozens or even hundreds of fibers. That setup ... Read more The post Multi-Core Fiber and How It Is Used in Data Centers appeared first on Justin Wilson (j2sw). ## What Is an AAU in Cellular Networks? DevFeed: [What Is an AAU in Cellular Networks?]() Original publisher: [Read original article]() Author: j2sw Published: 2026-07-22T19:23:00Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [Networks](), [5G](), [Hardware]() Tags: [5g](), [aau](), [cellular](), [fiber](), [hardware](), [installation](), [lte](), [massive-mimo](), [networks](), [signal](), [telecommunicationds](), [tower](), [wireless-infrastructure](), [wireless-networking]() ### AI overview This article explains Active Antenna Units (AAUs) in cellular networks. It describes how AAUs integrate antennas and radio components, use fiber and power instead of long coaxial runs, reduce RF loss, and support technologies such as Massive MIMO. It also discusses installation considerations, including greater weight and higher hardware cost. ### Source excerpt A little off the beaten path on this one. We are diving into a big part of a Cellular tower deployment. Many sites now use an Active Antenna Unit, or AAU. The radio and the antenna are built into the same enclosure. An AAU combines the antenna, radio transceivers, power amplifiers, and low-noise amplifiers into ... Read more The post What Is an AAU in Cellular Networks? appeared first on Justin Wilson (j2sw). ## How Passive Optical Networks (PON) Work DevFeed: [How Passive Optical Networks (PON) Work]() Original publisher: [Read original article]() Author: j2sw Published: 2026-07-22T12:35:00Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [Networks](), [gpon](), [Internet](), [Ethernet](), [gateway](), [Security](), [Deployment]() Tags: [ethernet](), [fiber](), [ftth](), [gateway](), [gpon](), [internet](), [internet-architecture](), [isp](), [networks](), [passive-optical-network](), [pon](), [providers](), [provisioning](), [router](), [security](), [xgs-pon]() ### AI overview This tutorial explains how Passive Optical Networks (PON) deliver residential fiber Internet. It describes the roles of the OLT, passive optical splitters, ONTs, and the customer router or gateway, including how providers share feeder fiber among subscribers and provision authorized ONTs. ### Source excerpt If you've spent any time looking into fiber Internet, you've probably run across terms like GPON, XGS-PON, OLT, and ONT. These are all parts of what's called a Passive Optical Network, or PON. Most residential fiber providers use PON because it lets them connect alot of homes without having to pull a separate fiber from ... Read more The post How Passive Optical Networks (PON) Work appeared first on Justin Wilson (j2sw). ## Sam's First Visit to An Internet Exchange DevFeed: [Sam's First Visit to An Internet Exchange]() Original publisher: [Read original article]() Author: j2sw Published: 2026-06-25T03:54:15Z Content type: release Language: en Sources: [Justin Wilson (j2sw)]() Topics: [networking](), [Networks](), [Internet Traffic](), [BGP]() Tags: [bgp](), [book](), [books](), [children](), [explainer](), [fiber](), [internet](), [internet-architecture](), [internet-exchange](), [internet-traffic](), [ix](), [ixp](), [j2-updates](), [j2sw](), [justin-wilson](), [network-engineering-resources](), [networking](), [networks](), [peering](), [router](), [sam](), [stem-book](), [traffic]() ### AI overview Justin Wilson announces A Kid's First Visit to An Internet Exchange, a children's picture book in which Sam learns how networks connect, peer, and move Internet traffic. The book is available in Kindle and paperback editions. ### Source excerpt Justin Wilson announces his second children's networking book, A Kid's First Visit to an Internet Exchange. Follow Sam as he learns how networks meet, peer, and move Internet traffic. The post Sam's First Visit to An Internet Exchange appeared first on Justin Wilson (j2sw). ## Fiber Optic Cable Colors Explained: Yellow, Orange, Aqua, Green, and More DevFeed: [Fiber Optic Cable Colors Explained: Yellow, Orange, Aqua, Green, and More]() Original publisher: [Read original article]() Author: j2sw Published: 2026-06-16T13:03:00Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [datacenter](), [Networks](), [Ethernet]() Tags: [color](), [data-centers](), [ethernet](), [fiber](), [fiber-colors](), [multi-mode](), [network](), [network-operations](), [single-mode](), [upc](), [yellow]() ### AI overview This article explains how fiber-optic patch-cable jacket colors commonly indicate fiber types, supported wavelengths, or connector styles. It describes yellow single-mode fiber, orange OM1 and OM2 multimode fiber, and aqua OM3 and OM4 multimode fiber, while noting that color improves identification and troubleshooting but does not affect light transmission. ### Source excerpt Fiber optic patch cables come in several colors, each helping identify the fiber type or connector style inside the network. Learn what yellow, orange, aqua, lime green, blue, and green fiber cables typically represent in data centers, ISPs, and telecommunications networks. The post Fiber Optic Cable Colors Explained: Yellow, Orange, Aqua, Green, and More appeared first on Justin Wilson (j2sw). ## How Rain Affects Wireless Microwave Links: 24 GHz, 60 GHz, and 80 GHz Compared DevFeed: [How Rain Affects Wireless Microwave Links: 24 GHz, 60 GHz, and 80 GHz Compared]() Original publisher: [Read original article]() Author: j2sw Published: 2026-06-15T09:47:43Z Content type: tutorial Language: en Sources: [Justin Wilson (j2sw)]() Topics: [Network](), [Network design](), [Internet](), [data centers]() Tags: [24ghz](), [60ghz](), [80ghz](), [adaptive](), [backhaul](), [capacity](), [changes](), [e-band](), [error-correction](), [fiber](), [microwave](), [network](), [network-design](), [perfomance](), [radio](), [reduction](), [rf](), [wireless](), [wireless-networking]() ### AI overview This article explains how rain fade affects wireless microwave links, with emphasis on 24 GHz, 60 GHz, and 80 GHz bands. It describes how precipitation reduces signal strength, causes adaptive modulation and throughput reductions, and can eventually cause a link to drop when fade margin is exhausted. ### Source excerpt Rain can have a major impact on wireless microwave links, especially as frequencies increase. Learn how rain fade affects 24 GHz, 60 GHz, and 80 GHz circuits, and why fade margin is critical for reliable network design. The post How Rain Affects Wireless Microwave Links: 24 GHz, 60 GHz, and 80 GHz Compared appeared first on Justin Wilson (j2sw). ## Temporal Ruby SDK Reaches General Availability with Rust Core and Deterministic Fiber Scheduler DevFeed: [Temporal Ruby SDK Reaches General Availability with Rust Core and Deterministic Fiber Scheduler]() Original publisher: [Read original article]() Author: Chad Retz Published: 2025-10-16T00:00:00Z Content type: article Language: en Sources: [Temporal Blog]() Topics: [Ruby](), [SDKs](), [Rust](), [Programming](), [cancellation](), [Code](), [Open Source]() Tags: [announcements](), [asynchronous](), [cancellation](), [fiber](), [guardrails](), [open-source](), [ruby](), [rust](), [scheduler](), [sdk](), [workflows]() ### AI overview Temporal Ruby is now generally available, providing Ruby developers with a native-feeling SDK for building durable software and Workflows. The article introduces its programming model and demonstrates Activities, deterministic fibers, durable timers, cancellation, and updates, while also discussing the Rust-powered implementation and execution guardrails. ### Source excerpt Temporal Ruby SDK is GA. Build durable Ruby Workflows with native APIs, a Rust-powered core, a deterministic fiber scheduler, and guardrails for safe execution.