Norma ansi - tia - eia 942

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The Purpose of ANSI/TIA/EIA-942
Telecommunications Infrastructure Standard for Data Centers
• The purpose of this standard is to provide requirements and guidelines for the design and installation of a data center or computer room. • It is intended for designers who needa comprehensive understanding of the data center design including the facility planning, the cabling system, and the network design. • It facilitates the planning for data centers to occur earlier in the building development process (architectural, facilities, and IT). Data centers support a wide range of transmission protocols. Some of these protocols impose distance restrictions that are shorterthan those imposed by this standard. When applying specific transmission protocols, consult standards, regulations, equipment vendors, and system service suppliers for applicability, limitations, and ancillary requirements. Consider consolidating standardized and proprietary cabling into a single structured cabling system. The Standard Specifies: • Cabling design • Network design • Facilitiesdesign • Informative annexes containing “best practices” and availability requirements • Spaces • Pathways • Racks/cabinets

Section Contents

ANSI/TIA/EIA-942
Telecommunications Infrastructure Standard for Data Centers
Data Center Cabling Infrastructure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66 Hot and Cold Aisles . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .67 Horizontal Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68 Backbone Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69 Recognized Cabling Media for Horizontal and Backbone Applications . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . .70 Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

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Standards Reference Guide

Standards Reference Guide

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Data Center CablingInfrastructure
The basic elements of the data center cabling system structure are the following: • Horizontal cabling • Backbone cabling • Cross-connect in the entrance room or main distribution area • Main Cross-Connect (MC) in the main distribution area • Horizontal Cross-Connect (HC) in the telecommunications room, horizontal distribution area or main distribution area. • Zone outlet or consolidationpoint in the zone distribution area • Outlet in the equipment distribution area

Hot and Cold Aisles Cabinets and racks shall be arranged in an alternating pattern, with fronts of cabinets/racks facing each other in a row to create “hot” and “cold” aisles. Cold aisles are in front of racks and cabinets. If there is an access floor, power distribution cables should be installed here under theaccess floor on the slab. Hot aisles are behind racks and cabinets. If there is an access floor, cable trays for telecommunications cabling should be located under the access floor in the hot aisles. A minimum of 1 m (3 ft) of front clearance shall be provided for installation of equipment. A front clearance of 1.2 m (4 ft) is preferable to accommodate deeper equipment. A minimum of 0.6 m (2 ft) ofrear clearance shall be provided for service access at the rear of racks and cabinets. A rear clearance of 1 m (3 ft) is preferable. Some equipment may require service clearances of greater than 1 m (3 ft).
Front Cabinets Rear This row of tiles can be lifted "HOT" Aisle (Rear of Cabinets) Rear Cabinets Align front or read of cabinets with edge of floor tiles This row of tiles can be lifted This...