--- title: "#1 Welcome to the COS Advent Calendar!" description: Welcome to this year's edition of our Advent Calendar! image: https://insights.cossystems.com/hubfs/Advent%20Calendar%20496x300%201-2.png --- ![](https://insights.cossystems.com/hubfs/Advent%20Calendar%20496x300%201-2.png) # Unwrap the 2025 COS Advent Calendar: Practical goodies for fiber teams, every day 🎁 It is the holiday season — and this year’s COS Advent Calendar is packed with hands-on treats your team can actually use. Every day until Christmas, we’ll drop a bite-size resource you can put to work right away: fun videos, real-world case studies, seasonal playbooks, whitepapers, and more. Kick off with a hello from Isak & Maren, then dive in! ## What’s inside (and why you’ll care) - Do-this-today how-tos. Clear guides for the work you do daily — so operators and admins can move fast with confidence.  - Seasonal playbooks. Practical scripts to run timely campaigns—like holiday promotions in the customer portal. - Case studies & spotlights. Stories from operators and partners showing what’s actually working—demand aggregation tactics, offer design, and how open-access models lift take rates without increasing headcount. - “What’s new” product tour. A crisp overview of updates that smooth daily work - Industry context, made simple. We zoom out with white papers and explainers so your roadmap stays aligned with where the market is headed—without the jargon. [ Reach out and learn more! ](https://www.cossystems.com/contact-us/) [ Check out our Youtube channel for more insightful videos! ](https://www.youtube.com/channel/UCq1Qt3qaaifS84J8J7Jz33Q)   ## Related Articles [![](https://insights.cossystems.com/hubfs/Advent%20Calendar%20496x300%2022.png) ](https://insights.cossystems.com/cos-advent-calendar/22-open-access-comes-alive-at-network-x-paris) [Open Access Network (OAN)](https://insights.cossystems.com/cos-advent-calendar/tag/open-access-network-oan) ### [#22 Open Access Comes Alive at Network X Paris](https://insights.cossystems.com/cos-advent-calendar/22-open-access-comes-alive-at-network-x-paris) At Network X 2025 in Paris, the [Broadband Forum Innovation Demos](https://www.broadband-forum.org/video-insights/2025-innovation-demonstrations-overview/) served as a powerful stage to demonstrate what open access looks like when it actually works. For us,... ![Maren Buchmüller](https://insights.cossystems.com/hs-fs/hubfs/1687264710275.jpeg?width=45&name=1687264710275.jpeg) [Maren Buchmüller](https://insights.cossystems.com/cos-advent-calendar/author/maren-buchmüller) [Read More](https://insights.cossystems.com/cos-advent-calendar/22-open-access-comes-alive-at-network-x-paris) [![](https://insights.cossystems.com/hubfs/Advent%20Calendar%20496x300%2011.png) ](https://insights.cossystems.com/cos-advent-calendar/11-cos-wholesale-engine-the-orchestrator-for-open-access-ma-driven-fiber-networks) [Campaigns](https://insights.cossystems.com/cos-advent-calendar/tag/campaigns) [Promotions](https://insights.cossystems.com/cos-advent-calendar/tag/promotions) ### [#11 COS Wholesale Engine: The Orchestrator for Open Access & M&A-Driven Fiber Networks](https://insights.cossystems.com/cos-advent-calendar/11-cos-wholesale-engine-the-orchestrator-for-open-access-ma-driven-fiber-networks) As Open Access and wholesale fiber models take off, many operators are hitting the same wall: their legacy BSS/OSS stacks weren’t built for multi-ISP, multi-vendor, or... ![Maren Buchmüller](https://insights.cossystems.com/hs-fs/hubfs/1687264710275.jpeg?width=45&name=1687264710275.jpeg) [Maren Buchmüller](https://insights.cossystems.com/cos-advent-calendar/author/maren-buchmüller) [Read More](https://insights.cossystems.com/cos-advent-calendar/11-cos-wholesale-engine-the-orchestrator-for-open-access-ma-driven-fiber-networks) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Maren Buchmüller", "url" : "https://insights.cossystems.com/cos-advent-calendar/author/maren-buchmüller" }, "dateModified" : "2025-12-01T08:42:19.036Z", "datePublished" : "2025-11-30T23:15:00.000Z", "headline" : "#1 Welcome to the COS Advent Calendar!", "image" : [ "https://insights.cossystems.com/hubfs/Advent%20Calendar%20496x300%201-2.png" ], "mainEntityOfPage" : { "@id" : "https://insights.cossystems.com/cos-advent-calendar/1-intro-to-advent-calendar", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://insights.cossystems.com/hubfs/cos.png" }, "name" : "COS Systems" } } ``` ```json { "@context" : "https://schema.org", "@type" : "VideoObject", "caption" : { "@type" : "MediaObject", "contentUrl" : "https://insights.cossystems.com/media-transcripts/200959506768/en.vtt", "inLanguage" : "en", "name" : "en Captions" }, "contentUrl" : "https://2664240.fs1.hubspotusercontent-na1.net/hubfs/2664240/intro-video-advent-calendar-isak-och-maren.mp4", "dateModified" : "2025-11-26T10:21:37.455Z", "description" : "Welcome to this year's COS Advent Calendar! Join Maren and Isak as they unveil an exciting annual tradition packed with surprises and valuable insights. \n\nIn this video, you'll learn about the unique and engaging format of the Advent Calendar, which has garnered enthusiastic responses in previous years. Each day, participants can open a new door to discover fresh content, including:\n\n- **Daily Surprises**: From case studies to exciting product enhancements, there's something new to explore every day.\n- **Open Access Day Highlights**: Look forward to the upcoming Open Access event in 2026, hosted with Fiber Connect in Florida.\n- **Innovative Insights**: Get a sneak peek into future trends, white papers, and open access materials that will equip you for what's ahead.\n\nThis year has been incredibly busy at COS, and we have plenty of valuable information to share with you. \n\n\nDon’t miss out on this opportunity to stay updated and inspired. Follow us along this journey and enjoy the wealth of knowledge we have in store for you.", "duration" : "PT1M36.867S", "height" : 1080, "name" : "intro-video-advent-calendar-isak-ond-maren", "thumbnailUrl" : "https://2664240.fs1.hubspotusercontent-na1.net/hubfs/2664240/intro-video-advent-calendar-isak-och-maren.mp4/medium.jpg?t=1764152497455", "uploadDate" : "2025-11-25T17:43:14.224Z", "width" : 1920 } ```