In telecommunication, a main distribution frame (MDF) is a distribution frame on one part of which the external trunk main distribution frame picture 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 main distribution frame 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.
Source: from Federal Standard 1037C and from MIL-STD-188
Electronics Topics
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. The design and construction of electronic circuits to solve practical problems is part of the fields of electronic engineering, and the hardware design side of computer engineering. The study of new semiconductor devices and their technology is sometimes considered as a branch of physics.
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