How does MF signaling work? - Dial Equipment Appreciation, Part 3
16:22
Crossbar's Hidden Superpower: Alternate Routing!
19:03
The Machine that Makes Your Phone Ring
35:12
How does a No. 1 Crossbar work? - Dial Equipment Appreciation, Part 2
17:22
Mobile Radio Duplexer Tuning
41:36
Why isn't the 1XB completing calls?
15:43
What happens if you leave your phone off the hook?
22:38
My vintage Strowger Telephone Exchange Demonstrator
37:31