551B Key Systems Unit

A Western Electric Key Systems Unit (KSU) from the early 1970s. It's a tangled mess of wires and connections, but it is complete. Came with the ring generator too (not pictured). The second KSU cabinet was probably added to supply the customer with another line.

Archivist's notes: enough time has passed and the building is no longer there, but I "liberated" this KSU from an abandoned Sak's Off Fifth in Millburn, New Jersey. The building had been vacant since at least 2005, and had been caught up in a redevelopment conflict, so it was pretty decrepit in there. This unit was found in a closet to the side of the main shopping floor. I hope to figure out how to wire it up so I can use it.

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