Encyclopedia > Main distribution frame

  Article Content

Main distribution frame

In telecommunication, 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.

Note 1: The MDF is used to cross-connect any outside line with any desired terminal of the multiple cabling or any other outside line.

Note 2: The MDF usually holds central office protective devices and functions as a test point[?] between a line and the office.

Note 3: 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

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Philippe de Carteret III

...     Contents Philippe de Carteret III Philippe de Carteret III was Seigneur of Sark from 1643 to 1663. Preceded by:Philippe de Carteret ...