Main distribution frame
From Free net encyclopedia
In telecommunications, a 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.
The MDF is used to cross-connect any outside line with any desired terminal of the multiple cabling or any other outside line.
The MDF usually holds central office protective devices and functions as a test point between a line and the office.
The MDF in a private exchange performs functions similar to those performed by the MDF in a central office. Synonym (in telephony) main frame.
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