Here they are. We nick-named them "our telephone booths" because that's what they are. 75% of the equipment is telco equipment. The other 25% is IP routers.

See the row of a dozen slim modules in the bottom of the right rack? Each one is a 64 or 128 kbps ISDN leased-line. Those are what is left from the wall-mounted NTBA units. Remember the holes from the last picture? That's the wall behind the booths.

BTW, opening the doors raises the noise level significantly.