2024-10-12 commercial HF radio

I have quipped before about "underground datacenters," and how they never succeed. During the late decades of the Cold War and even into the '00s, the military and (to a lesser extent) the telecommunications industry parted ways with a great number of underground facilities. Missile silos, command bunkers, and hardened telephone exchanges were...

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Prescript: I originally started writing this with the intent to send it out to my supporter's newsletter, EYES ONLY, but it got to be long and took basically all day so I feel like it deserves wider circulation. You will have to tolerate that it begins in the more conversational tone I use for the supporters newsletter. I am going to write a bit...

We currently find ourselves in something of a series, working our way from private lines to large private line systems like the four-wire private-line national warning system. Let's continue to build on the concept of the private line into large corporate systems. In principle, a large organization in want of a private telephone system could...

Previously on Deep Space Nine, we discussed the extensive and variable products that AT&T and telephone operating companies sold as private lines. One of the interesting properties of private line systems is that they can be ordered as four-wire. Internally, the telephone network handles calls as four-wire with separate talk and listen pairs (or...