I have those for popping in the back of defective modems (in the "phone"
port).
> This is handy, since we broke all our lines out onto a rack full of RJ-11
> outlets *8-). NOw all we do is plug one of these little gadgets in where
> the phone cord went, and it's busied. Previously, we'd short tip and
> ring together on our 66-blocks with alligator clips. This didn't scale
> well at ALL for outages and whatnot.
I buy 25 pair cables with 50pin connector on one end and crimp rj11's
on the other end. Pop them straight onto the 21X's. If I need to busy
out entire 21X's, I have a couple of 50pin connectors with all the pins
short together.