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.; 一部分成為中央辦公大樓的永久外線的端點(diǎn),另一部分接用戶電纜的一種配線 盤。用戶電纜可以連接任何終端或其它外線。它通常具有對中央辦公室進(jìn)行保護(hù)的裝置 及線路與辦公室之間的測試點(diǎn)的功能。在專用交換機(jī)構(gòu)中,主配線架具有類似的用途。