C120-H007-08EN 273.3 Precautions in Preparation of an Equipment LayoutEven if a single device has multiple functions, it should be grouped according to thedegree to which it can be run with or without manual intervention.Generally, devices may be divided into the following groups: Consoles for visual monitoring I/O devices requiring interchangeable and portable storage media Connection equipment that has a long service life and seldom requires replacement Data processing devices (such as CPUs and file units) that normally do not requiremanual operationFigure 3.1 shows a conceptual view of grouping.Figure 3.1 Concept of units operational grouping(2) Concentration of small equipmentConcentrate small devices, such as modems and LAN units, on shelves.For a large number of small, floor-mounted devices, such as display controllers, LANcontrollers, link adapters, and optical channel adapters, consider erecting a singlecabinet to house them all.(3) Entrance and passageLay out the equipment to facilitate human traffic and the movement of supplies andstorage media through the entrance. Allow also for human traffic and the movementof media, equipment, and instruments when locating the passages in the room.(4) MaintainabilityProvide service clearance around server systems, air conditioners, and power supplyfacilities to allow access for inspection or maintenance.File unitsCPUs Line unitsI/O devicesConsoles