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The 3ESS at the Connections Museum while running

The Number Three Electronic Switching System (3ESS) is an electronic switching system on the second floor of the Connections Museum. It was originally installed in 1978 as a Community Dial Office (CDO) in the village of Crosby, Washington. It contains a custom tape drive emulator created by volunteers at the museum after the original tapes began to fail. (Full article...)

Did you know...

Panel Switch

• ...that the museum's Panel (pictured), 1XB, and 3ESS are the last working switches of their kind in the world?
• ...that the museum has the world's only authentic phreaking demo at the 1XB?
• ...that the museum's oldest working switch is over 100 years old?
• ...that the museum's only non-Western Electric switch was manufactured by Nortel?
• ...that one of the museum's switches was installed on a battleship, two ghost towns-to-be, and a scout camp?
• ...that the museum has a working video conferencing setup from the 1970s?
• ...that some of the computers in the museum can connect to the internet via authentic dial-up?
• ...that an old waffle maker is used to provide ballast for the museum's working mercury arc rectifier? (under construction)

This is the Telecommunications Inventory Wiki. It is primarily for the Connections Museum inventory. Some information will only be editable by museum volunteers (like items in museum inventories) while other information (like general pages about item models) will be editable more widely.

Before creating new pages, please familiarize yourself with the wiki's namespaces.

Pages support data (under the "Edit data" tab) added in pre-set schemas to populate introductory paragraphs (because the introductory paragraph for certain things like different models of phone will all be very similar).