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Setting up Homelab T3

62.0K views· 2,899 likes· 47:51· Jan 21, 2026

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Getting a real T3 connection going down here in the homelab. It runs at a blistering 44.7 Mbits per second, but is also capable of carrying over 600 phone calls. On the way we'll do a deep dive on the history of T-Carrier, specifically T1 and why AT&T invented T-Carrier in the first place. We'll use a bunch of Cisco 7200 routers to get the T3 connection working, including a very interesting Cisco 7201 with a single port adapter slot. Check me out on Patreon: https://www.patreon.com/clabretro Sources: Many BSPs and Bell System articles from https://www.telecomarchive.com/ https://www.telephonecollectors.info/ https://www.youtube.com/watch?v=4d26n6-vVvA https://www.youtube.com/watch?v=wn71QBApCRg https://www.youtube.com/watch?v=iBPTM_irIco https://long-lines.net/tech-equip/misc/Graybar103-0693.html https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~200183~3000108:Lines-Of-The-Bell-Telephone-Compani https://archive.org/details/bstj2-2-41 https://www.telephonecollectors.info/index.php/browse/bsps-bell-system/at-t-specifications/3209-at-t-spec-4455-public-telephone-signs-tl/file https://www.telephonecollectors.info/index.php/browse/ads/western-electric-ads/14633-1960s-ad-we-one-reason-youre-sure-of-connecting-pdf/file https://www.telephonecollectors.info/index.php/browse/document-repository/catalogs-manuals/bell-system-we/1794-weco-l5-carrier-tl/file https://telecomarchive.s3.us-east-2.amazonaws.com/docs/bsp-archive/TR/53121_1975-11.pdf https://upload.wikimedia.org/wikipedia/commons/b/bd/Bell_System_advertisement_in_Western_Electric_v1no1_News_March_1912_promoting_universal_service.jpg https://ia801602.us.archive.org/9/items/bstj44-7-1405/bstj44-7-1405.pdf https://www.comsoc.org/engagement-community/committee/communications-history-standing-committee/communications-history/communications-history/history-articles https://patentimages.storage.googleapis.com/4c/fa/98/01824524c61246/US980356.pdf https://thepastpresented.com/index.php/2017/06/23/before-the-internet-five-conversations-on-one-pair-of-wires-1918/ https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=6685746 https://www.telephonecollectors.info/index.php/browse/document-repository/catalogs-manuals/bell-system-we/1794-weco-l5-carrier-tl/file https://www.construction-physics.com/p/building-the-bell-system https://www.telephonecollectors.info/index.php/browse/ads/western-electric-ads/14605-1960s-ad-we-there-are-4242-wires-in-this-cable-pdf/file Music by Karl Casey @ White Bat Audio #netro #retrotech #retrocomputer #networking #homelab #cisco #telephony Serial to USB converter: https://amzn.to/4mAXDlJ Rack stuff StarTech Universal Rack Rails: https://amzn.to/404JV1Q StarTech 42U Rack: https://amzn.to/482c3oh StarTech 25U Rack: https://amzn.to/3mEB7hS Tripp Lite SMART1500LCD UPS: https://amzn.to/3KZW3Jw 1U 24 Port Patch Panel: https://amzn.to/3Nm0bFa 1U Brush Panel: https://amzn.to/3mExAA3 1U Rack Shelf: https://amzn.to/3oaDclT Video gear Camera: https://amzn.to/4al3xjA Main mics: https://amzn.to/4dCUuO2 Desk mic: https://amzn.to/3ye8BsV Note: The above are Amazon affiliate links. It doesn't cost you extra, but I'll receive a commission which will help keep the content coming. I only link to things I've personally ordered. 00:00 Intro 00:40 Cisco 7201 Overview 05:11 T-Carrier History 15:24 How T1 Works 24:24 Installing IOS on the Cisco 7201 32:26 Setting up a T3 Connection 40:23 T3 Speed Test 44:18 Future Plans 45:38 Final Thoughts

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