On the second floor, rooms B279, B332, B294, and B375 have painted double doors with a perpetual hum. The maps are out of date and do not show the actual rooms. The northern three share room numbers with the house storage. The southern one is the front end of what was a closet. The back of the closet is now part of the Brown House den storage. The door to Louden's den storage ("B293" according to the door) is a metal door, unline other den storage doors. The map indicates that when the telecom room was installed, the den storage door was moved to where it is now, east farther.
According to the maintenance log, these closets are Telecom rooms. See https://restma.its.iastate.edu/query_wo_results.html?RC-21102305
There are four fiberoptic lines coming up from the basement in each house's tub room. Each line stops at a floor in a switch. The network cables coming out of the switch run into holes into the hallway ceiling. The cable trays above the drop ceiling are mostly empty. There appears to be another false ceiling above the drop ceiling where the Ethernet cords are.
During winter break of 2014-2015, the triangular exit signs near the dens were installed.