There are other times. though, that the extra pairs on an extension cable from an old 1A2 system saves you from an expensive and messy wiring addition in an old building with finished ceilings and layers-thick brick walls. It's certainly easier and a lot more fun to do demolition work, but isn't always the best or least expensive solution.
Just sayin'
I have taken advantage of that several times. In one old bank building, the owner would not allow us to fish an Ethernet cable between floors for fear of disturbing existing asbestos. Used a StarTech 2-wire extender (basically a point-to-point DSL) on the old 25-pair cables to get Ethernet to a lower-floor office. Still have a couple harmonicas we used there (that company moved out when the building was gutted for renovation).
