Cabinets
The DEC 7000/10000 AXP system is housed in the system cabinet. The upper part of the cabinet contains the LSB card cage on the left and the control panel and power subsystem on the right. Below is the cooling system, which occupies the middle of the cabinet. It consists of a single blower that draws air from the top and bottom of the cabinet, expelling it through vents in the middle. Under the blower are four plug-in unit (PIU) quadrants for PIUs, enclosures which house options.
The expander cabinet houses additional PIUs. It is identical to the system cabinet except that the LSB card cage is replaced by two additional PIU quadrants, identified as 5 and 6. Up to none, one or two expander cabinets are supported by the DEC 7000/10000 AXP systems. The expander cabinets are placed against the sides of the system cabinet, with the first placed to the left and the second to the right.
The DEC 10000 AXP may utilize an additional type of cabinet, the battery cabinet, of which up to two may be installed against the sides of the expander cabinet(s), with the first to the left and the second to the right. These cabinets are different than the other cabinets in every respect, they are narrower physically and only provide space for two PIUs, one above the other. These PIUs are used only for additional battery PIUs to prolong the continued operation of the system in the event of the power failure in comparison to a system using only battery PIUs housed in the system or expander cabinets.
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—Richard Cobden (1804–1865)