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Speedy Cutover Service, SXS switching cutover to ESS filmed live at Glendale CA central office, 1984

AT&T Tech Channel · documentary · Watch on YouTube

History of computingNetworking & internet infrastructure

What it is

A 1984 AT&T film showing the live cutover of a Glendale, California central office from step-by-step switching to an electronic switching system. Installers prepare the site and then cut cables in a coordinated operation.

Why Hacker News recommends it

HN links it as a vivid example of high-stakes telco cutovers, done with careful coordination, big cable cutters and under a minute of downtime.

  • 2 people recommended it
  • 2 different months
  • 0 strong recommendations
  • first 2018, last 2025

What HN commenters said

  1. “Total downtime was just 47 seconds.”

    Shows a live telco switch cutover with careful coordination and brief downtime.

    tjohns, 2018-12 · Recommendation · in “911 emergency services go down across the US after CenturyLink outage”

  2. “This[1] is a great video on the topic of cutovers.”

    Impressively low-downtime telephone switch cutover.

    Doxin, 2023-04 · Recommendation · in “In 1930, the 22M-pound Indiana Bell building was rotated 90 degrees”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: at&t, central office, ess, telecom history, cutover

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