Computer Hardware Terms, Glossary and Dictionary

In telecommunication, Main Distribution Frame (MDF) is a distribution frame on one part of which the external trunk cables entering a facility terminate, and on another part of which the internal user subscriber lines and trunk cabling to any intermediate distribution frames terminate. MDF is a cable rack that interconnects and manages the telecommunications wiring between itself and any number of IDFs (Intermediate distribution frame), which connects internal lines to the MDF. For example, an enterprise that encompasses a building with several floors may have one centralized MDF on the first floor and one IDF on each of the floors that is connected to the MDF.

Related Terms

MDF: Main Distribution Frame