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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.
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 .
Source: from Federal Standard 1037C and from MIL-STD-188
Last updated: 05-12-2005 17:07:44
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details