On June 21, 2012 at 11:05, fcwilt said...
Well clearly you have to wire the new connector the same as the old one. I did say both ends have to be the same.
My point is that you often cannot see the other end.
You've lost me here.
If you use cables that are factory made, it doesn't matter which way they're terminated. True. But service sometimes requires reterminating cables -- the weak point in following A or B -- and if the entire cabling system has, say, A in factory-made cables and B in hand-made cables, but you can't tell which are factory and which are hand-made because they look the same, there will be blood -- that is, mistakes will be made.
It's easy to say they all have to be the same. In fact, this thread is more or less about working out whether there's a particular "same" to use all the time. There isn't, and the likelihood of particular trades using A or B is pretty consistent, based on the answers here.