Editing Combined distribution frame (section)

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In [[telecommunications]], a '''combined distribution frame''' (CDF) is a [[distribution frame]] that combines the functions of [[Main distribution frame|main]] and [[intermediate distribution frame]]s and contains both vertical and horizontal terminating blocks.  

The vertical blocks are used to terminate the permanent outside lines entering the station. Horizontal blocks are used to terminate [[inside plant]] equipment. This arrangement permits the association of any outside [[telephone line|line]] with any desired [[terminal equipment]]. These connections are made either with twisted pair wire, normally referred to as jumper wire, or with [[optical fiber]] cables, normally referred to as jumper cables. 

In technical control facilities, the vertical side may be used to terminate equipment as well as outside lines. The horizontal side is then used for [[Patch panel|jackfields]] and battery terminations.