| 单词 | main distributing frame (MDF) |
| 释义 | main distributing frame (MDF)A distributing frame, on one part of which terminate the permanent outside lines entering the central office building and on another part of which terminate cabling such as the subscriber line multiple cabling or trunk multiple cabling, used for associating any other outside line. It usually carries the central office protective devices and functions as a test point between line and office. In a private exchange, the main distributing frame is for similar purposes.; 一部分成为中央办公大楼的永久外线的端点,另一部分接用户电缆的一种配线 盘。用户电缆可以连接任何终端或其它外线。它通常具有对中央办公室进行保护的装置 及线路与办公室之间的测试点的功能。在专用交换机构中,主配线架具有类似的用途。 |
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