My personal experience with 60vdc (actually square wave) in the US had to do with strand mounted devices on the pole for CATV equipment. And more of a headend issue with cable tv companies than a CO environment. This was in the process of being changed to 90vdc about two years ago. Strictly US again.
COs using 48vdc and 230vac seemed popular for Western Europe, but that's just from limited experience with only a few customers. I wouldn't know what the standard for repeaters out on line would be in the US or international. Anyone know that?
