network closet

from The Free On-line Dictionary of Computing (8 July 2008)

network closet

   <networking> The place where {network} {hardware} (other than
   cabling) is installed.  The space should be used primarily for
   storage, be dry, and have electricity available.  Since
   network equipment rarely needs attention once installed and
   tested, the network closet can have limited accessibility.

   (1995-05-05)