TIA-942

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6.5.2 Location When selecting the computer room site, avoid locations that are restricted by building components that limit expansion such as elevators, building core, outside walls, or other fixed building walls. Accessibility for the delivery of large equipment to the equipment room should be provided (see ANSI/TIA-569-D).  6.5.3 Environmental design - HAC ̀If the computer room does not have a dedicated HVAC system, the computer room shall be located with ready access to the main HVAC delivery system. A computer room is typically not recognized as such by the AHJ unless it has a dedicated HVAC, or utilizes the main building HVAC and has automatic dampers installed. 6.5.4 Electrical design Separate supply circuits serving the computer room shall be provided and terminated in their own electrical panel or panels.  The power shutdown requirements for computer room equipment are mandated by the AHJ and vary by jurisdiction.

6.6 Entrance room reuiremen儀ts 6.6.1 General The entrance room is a space, preferably a room, in which access provider-owned facilities interface with the data center cabling system. It typically houses telecommunications access provider equipment and is the location where access providers typically hand off circuits to the customer. This hand-off point is called the demarcation point. It is where the telecommunications access provider’s responsibility for the circuit typically ends and the customer’s responsibility for the circuit begins. The entrance room will house entrance pathways, protector blocks for balanced twisted-pair and coaxial entrance cables, termination equipment for access provider cables, access provider equipment, and termination equipment for cabling to the computer room. 6.6.2 Location The entrance room should be located to ensure that maximum circuit lengths from the access provider demarcation points to the end equipment are not exceeded. The maximum circuit lengths need to include the entire cable route, including patch cords, changes in height, and cable management routing within racks or cabinets. Annex A provides specific circuit lengths (from demarcation point to end equipment) to consider when planning entrance room locations.