Consulting-Specifying Engineer - October 2008 - (Page 11)

Letters cabling infrastructure requirements of this standard. ANSI/TIA/EIA 862 is very similar to the ANSI/TIA/EIA 568-B and 569-A standards for voice and data communications. The subcommittee tried to follow the 568 standard with the goal of using the same media and terminology as 568-B, which provides the benefit of a common platform for BAS cabling. Since many BAS are turning toward an Ethernet protocol, its topology is specified in the 568 document. ANSI/TIA/EIA 862 is different in some important respects because it defines coverage area served by a BAS device. The coverage area (CA) description for BAS is similar to the work area (WA) description for voice/data cabling in ANSI/TIA/EIA 568. With the CA referring to the space served by one BAS device. For example, this could define the field of view of a security camera or the area in which a thermostat can sense temperature changes. The size of this coverage area is typically about 269 sq ft, based on average values from a study of floor lighting systems, security, and HVAC applications. The ANSI/TIA/EIA 862 Standard also defines a modified star topology for horizontal and backbone cabling that support known BAS application requirements. This topology essentially allows a chain from one cabled device to another, with the standard defining key elements of the horizontal cabling link, including the horizontal crossconnect (HC), horizontal cable, horizontal connection point (HCP), and an optional BAS outlet/connector. PAUL SCHOONOVER, RCDD GLUMAC PORTLAND, ORE. Author responds September M/E Roundtable correction In the September 2008 issue of Consulting-Specifying Engineer, in the M/E Roundtable “Cooking up ventilation” (page 14), we neglected to include participant Brian Rivet’s company name. Rivet’s company is Greenheck Fan Corp., Schofield, Wis. You have provided excellent information on the ANSI/TIA/EIA-862 standard. There are definitely some parallels in the BAS Standard and the Commercial Cabling Standard. TIMOTHY KUHLMAN, PE, RCDD ELECTRICAL ENGINEER AND TELECOMMUNICATIONS SPECIALIST, CH2M HILL PORTLAND, ORE. Input #208 at csemag m/quickResponse Consulting-Specifying Engineer • OCTOBER 2008 11 http://www.nxtbook.com/nxtbooks/reed/cse0908/?startid=14 http://www.uecorp.com http://www.uecorp.com http://csemag.com/quickResponse

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - October 2008

Consulting-Specifying Engineer - October 2008 Contents Viewpoint Letters News M/E Roundtable Cities Under One Roof Eight Design Tips for Integration Is 'Green' Really New? Down the Drain Product of the Year Awards Codes & Standards Case Study New Products Equipment Lifecycles Advertiser Index Green Space

Consulting-Specifying Engineer - October 2008

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