| 摘要 |
A subrack ( 1 ) includes a plurality of plug-in units ( 50 ), a pair of parallel sidewalls ( 10, 20 ), a bottom wall ( 24 ) and a top wall ( 30 ). Each plug-in unit engages a combination of code pins ( 60 ). Each of the bottom wall and top wall includes a first plate ( 35 ) and a second plate ( 31 ) engaged with the first plate. The first plate defines a plurality spaced slide channels ( 351 ) for slidably receiving the plug-in units therein respectively, and forms a plurality of L-shaped flakes ( 40 ) corresponding to the combination of code pins in front of each slide channel. The height, length and deviation to slide channel of the flakes vary with different combinations of code pins on the mounting panel, in order to match the combinations of code pins and enable the plug-in units be inserted into the subrack for preventing from mis-inserting operation.
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