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I used to do IT support back in the day. Our csr’s were large commercial users, but also included the the military in some circumstances. A repair man was sent out once to a large military base for a dead csu/dsu. He found that an enlisted tech had thrown the CSU’s O N / O F F switch to the OFF position thinking it stood for officer mode insomuch as they were sending encrypted data and he didn't have sufficient clearance. :~)

Speaking of CSU/DSUs, that reminds me of a client I used to service... I had installed a high speed Internet link, and about 3 weeks later, I got a call that their Internet was down. After speaking with them on the phone, it sounded like the problem was at their end, though they assured me that nothing had changed. But when I got there, everything was working without any problems. By the time I got back to the office, there was a message waiting for me that they were back down again. We played this game for the next 2 days. I was never able to find a problem. Finally I got a call back from the ISP for a conference call, and as I shut off the light and locked up their wiring closet, their Internet went down. It turned out that their phone provider had been out to upgrade their system. And it seems they decided to use an outlet from the datacomm battery backup. The power cable they unplugged was to the DSU/CSU, and they just plugged it into a wall outlet. Well, it just happened that the wall outlet was switched, and tied to the light switch for the wiring closet. Basically, every time we shut off the lights in their wiring closet, we wound up shutting off the power to the CSU/DSU, killing their Inernet connection. We left the light on in the closet until they got the phone provider to install the proper UPS.

Mark