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Bob D. worked for Pacific Northwest Bell from the early 1950s up until the early 1980s. He was a jack-of-all trades, and was frequently the guy to call if you had a problem that nobody could figure out. Bob's an absolute treasure! He's a great friend, and has a wealth of information about the inner workings of telephone switches. I took this video a few years ago with the intention of it just being for me, but after watching it again, I felt that others might enjoy it too.

He shows us the test frames of the 1XB and 5XB and tells a little story about how he discovered the ability to cut into anyone's telephone line from the CO.