How does a No. 1 Crossbar work? - Dial Equipment Appreciation, Part 2

All about the sounds and workings of the telephone network. There will be two back-to-back videos on the 1XB. This is the first. Our No. 1 Crossbar originally served Seattle out of the Kenwood/Lakeview central office in the northeast part of the city. It was brought to the museum in 1986. In 2018, it began a process of upgrades, adding 2 additional terminating senders, and 3 additional originating senders. The upgrade process is still underway. The marker video I mentioned: 00:00 Introduction 03:50 Block Diagram 05:11 How a Crossbar Switch Works 09:33 Calls through a No. 1 Crossbar 11:05 Connection & Dialing 13:26 Originating Marker 18:03 Signaling & Terminating Sender 23:50 Party Test 25:39 Terminating Marker 30:00 Review