Building Telephone Closets

LaPrice Ali

CNT2300-91 Service Project

Ben Franske

May 2010

Building Telephone Closets for Small to Medium sized Buildings

One of the of the 1st things to decide is where do you want the phone closet to be. Remember you want the closet is to be centrally located so as to ensure that all copper voice and data cable sheath lengths out to the outlets are less than 90 m (295ft).

Once you decided where. The phone company will bring in their facilities. This is called the MDF or Main Distribution Frame.This closet shall interconnect with each Telecommunications Closet (TC) or Intermediate Distribution Facility (IDF) via distinct, dedicated multimode and single-mode fiber optic backbone cables, 25 pair twisted pair CAT 5 data risers and 100 pair twisted pair voice riser cables. In smaller buildings, where only one telecommunications closet is required, the MDF will also function as the IDF.