Use an IOA shelf (also called an IOA bracket) when installing half-height IOAs in the router. IOA shelves screw into the midplane between the upper/right bay (Adapter 0) and lower/left bay (Adapter 1). For example, in an E320 router, IOAs in the upper bay rest on the shelf, while IOAs in the lower bay use the guides on the bottom of the shelf to remain vertical. See Figure 20.
Figure 20: IOA Shelf
Caution: We recommend that you power down the router before removing or installing an IOA shelf between two slots that have modules installed in them already. Otherwise, you might short-circuit the installed modules if you accidentally touch the shelf to a module. An IOA shelf installation guide is available to ensure safe installation. Contact your account representative for more information.
To install an IOA shelf: