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They built a phone company for one weekend

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Source: Level 2 Jeff
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  • description: ShadyTel builds an entire mid-90s central telephone exchange, runs it for three days, and tears it down. Every year. I talked to them about their equipment and a new TDM frequency reference setup this year at VCF Midwest. Some of the things I mentioned in the video: - VCF Midwest: https://vcfmw.org - ShadyTel: https://shady.tel - MichaelWasHere blog post on VCF Network: https://www.michaelwashere.net/post/2026-09-14-vcfmw/ - MichaelWasHere blog post on VCF Frequency Reference: https://www.michaelwashere.net/post/2026-09-17-vcfmw-time/ - VCF Midwest 21 Telephone Information and Stats: www.dms-100.net/computers/VCFMW/21/ Support me on Patreon: https://www.patreon.com/geerlingguy Sponsor me on GitHub: https://github.com/sponsors/geerlingguy Merch: https://www.redshirtjeff.com Main Channel: https://www.youtube.com/@JeffGeerling 2nd Channel: https://www.youtube.com/@GeerlingEngineering Contents: 00:00 - This is ShadyTel 00:42 - Frequency reference and T1 lines 03:52 - Physical cabling and copper pairs 04:45 - The full telco equipment stack 07:29 - Talking Clock 08:18 - DSLAM and wireless signals 09:12 - Custom NIDs 10:39 - More about the T1 frequency strata 13:06 - Digging deeper and TDM demo at VCFMW20
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  • title: They built a phone company for one weekend

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