1、 TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Telecommunications Cabling Guidelines for Wireless Access Points TSB-162 March 2006 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of Copyright Telecommunications Industry Association P
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18、reless Access Points TABLE OF CONTENTS 1 INTRODUCTION.1 2 PURPOSE AND SCOPE 1 3 REFERENCES1 4 DEFINITIONS, ACRONYMS AND ABBREVIATIONS 2 4.1 Definitions2 4.2 Acronyms and abbreviations.2 5 TELECOMMUNICATIONS OUTLET LOCATIONS.2 5.1 Cell size.2 5.1.1 General2 5.1.2 Typical uniform cell size 4 5.2 Share
19、d media access considerations4 6 EXTERNAL ANTENNAS.5 7 POWER OPTIONS .5 7.1 General .5 7.2 Remote power.5 7.3 Local power.6 8 HORIZONTAL CABLING 6 9 ADMINISTRATION AND LABELING 7 10 SEPARATION OF POWER BRANCH CIRCUITS AND TELECOMMUNICATIONS CABLING 7 11 MOUNTING AND INSTALLATION .7 11.1 Shared tenan
20、t considerations7 11.2 Wireless access point mounting options .7 11.2.1 Wall-mount above drop ceiling 7 11.2.2 Wall-mount below drop ceiling 8 11.2.3 In-the-grid ceiling mount8 12 PERFORMANCE AND TESTING GUIDELINES 9 12.1 Balanced twisted pair cabling9 12.1.1 Channel testing guidelines 9 12.1.2 Perm
21、anent link testing guidelines9 12.2 Optical fiber cabling.10 Annex A (informative) Other wireless access point cabling options .11 i Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-
22、,-,-TSB-162 LIST OF FIGURES Figure 1 Cell sizing (wireless access point placed anywhere inside the cell) 3 Figure 2 Typical uniform cell size.4 Figure 3 Additional TO and wireless access point in cell.5 Figure 4 Typical wireless access point with remote power from a switch6 Figure 5 Typical wireless
23、 access point with remote power from a mid-span device6 Figure 6 Typical wireless access point with local power6 Figure 7 Typical wall-mount above drop ceiling.7 Figure 8 Typical wall-mount below drop ceiling .8 Figure 9 Typical in-the-grid ceiling mount 8 Figure 10 Integrated wireless access point/
24、TO11 LIST OF TABLES Table 1 80 m (262 ft) permanent link insertion loss field test values .10 FOREWORD (This foreword is not part of the TSB) TIA standards documents are developed within the Technical Committees of the TIA and the standards coordinating committees of the TIA standards board. Members
25、 of the committees serve voluntarily and without commission. The companies that they represent are not necessar-ily members of the TIA. The standards developed within the TIA represent a consensus of the broad expertise on the subject. This expertise comes from within the TIA as well as those out-si
26、de of the TIA that have an expressed interest. The viewpoint expressed at the time that this standard was approved was from the contributors experience and the state of the art at that time. Users are encouraged to verify that they have the latest revision of the TSB. This TSB has been prepared and
27、approved by the TR-42 Engineering Committee.ii Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TSB-162 1 INTRODUCTION A growing number of enterprises employ equipment at the “ed
28、ge” of the network that relies on physical connections to the cabling infrastructure at the work area, while also having the ability to maintain mobile network access at other locations. A wireless access point is a wireless de-vice which provides connectivity to other wireless devices within its co
29、verage area and also pro-vides interconnection to a wired network. The current suite of TR-42 infrastructure and cabling standards do not specifically cover cabling to wireless access points. Supplementary informa-tion is needed on the number of outlets and outlet placement for wireless access point
30、s. This Telecommunications Systems Bulletin (TSB) uses the topology and architecture of a multi-user telecommunications outlet assembly (MUTOA) as described in ANSI/TIA/EIA-568-B.1. The same concepts and requirements are used to develop the cabling guidelines for wireless access points. This TSB pro
31、vides a design and installation guideline for pre-cabling in a grid approach that al-lows the user flexibility when deploying wireless access points. The pre-cabled grid makes the building ready for a wireless infrastructure to be installed at any time. Additionally, wireless ac-cess point locations
32、 can be “fine tuned” by moving the wireless access point within each cell of the pre-cabled grid as necessary. This TSB is primarily focused on new buildings that are in the planning stage where pre-cabling in a grid approach is recommended. This approach can also be used in existing buildings where
33、 applicable. Site surveys are also advantageous for existing buildings and as the buildings are built and have been occupied and furnished. Alternative cabling methods that may be suitable are also described in Annex A. For code compliance, refer to the authority having jurisdiction (AHJ). 2 PURPOSE
34、 AND SCOPE This TSB provides guidelines on the topology, design, installation, and testing of telecommuni-cations cabling infrastructure, in compliance with ANSI/TIA/EIA-568-B.1 and TIA-569-B, for supporting wireless local area networks (WLAN) in customer-owned premises. This TSB in-cludes the cabli
35、ng between local area network (LAN) equipment and wireless access points in-cluding pathways and spaces to support the cabling and wireless access points. 3 REFERENCES The following standards contain provisions which are referenced in this TSB. At the time of pub-lication, the editions indicated wer
36、e valid. All standards are subject to revision, and parties are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. ANSI/TIA/EIA-568-B.1, Commercial b
37、uilding telecommunications cabling standard part 1: general requirements. ANSI/TIA/EIA-568-B.2, Commercial building telecommunications cabling standard part 2: balanced twisted-pair cabling components. ANSI/TIA/EIA-568-B.3, Optical fiber cabling components standard. ANSI/TIA/EIA-606-A, Administratio
38、n standard for commercial telecommunications infra-structure. 1 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TSB-162 IEEE 802.3af, Data terminal equipment (DTE) power via med
39、ia dependent interface (MDI). TIA-569-B, Commercial building standard for telecommunications pathways and spaces. 4 DEFINITIONS, ACRONYMS AND ABBREVIATIONS 4.1 Definitions cell: The unit topographical area. coverage area: The area served by a device. grid: A collection of adjacent cells. 4.2 Acronym
40、s and abbreviations AHJ authority having jurisdiction LAN local area network MUTOA multi-user telecommunications outlet assembly RF radio frequency TE telecommunications enclosure TO telecommunications outlet TR telecommunications room WAP wireless access point WLAN wireless local area network 5 TEL
41、ECOMMUNICATIONS OUTLET LOCATIONS 5.1 Cell size 5.1.1 General The wireless coverage area radius is impacted by a number of factors including: Building materials (concrete, drywall, wood, steel, etc.) Building configuration (closed, semi-closed, or open space) Building furnishings (cabinets, partition
42、s, furniture, etc.) WLAN radio frequency (RF) coverage design (e.g. adjacent floors, directional antennas) Occupant density These factors are taken into account by equipment and wireless local area network (WLAN) system vendors when using the site survey approach. These areas are outside the pre-cab
43、led grid approach of this TSB. The purpose of this section is to serve as a design guide, which may be used to appropriately size the cells needed for wireless access. The design of cells, in a grid approach, may also prove useful as a guide in environments such as in hospital rooms, class rooms, an
44、d confer-ence rooms where circumstances may warrant additional and smaller cells. Cell size is a design decision that is made when planning to accommodate user needs. 2 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking
45、 permitted without license from IHS-,-,-TSB-162 To appropriately design coverage, it is recommended that a cell be in the shape of a square. The telecommunications outlet (TO) will be placed at the center of this square, and will have a patch cord extending from it to the wireless access point. The
46、maximum length of this patch cord is the radius of the circle that defines the square cell. See figure 1. NOTES 1 RF planners should be consulted to ensure that all areas receive adequate coverage. 2 Refer to ANSI/TIA/EIA-568-B.1 subclause 6.4.1.5 for optical fiber cabling. TOTOTOTORXH max(max. hori
47、zontal link length)Active equipmentTRMax. 6 m (20 ft)equipment cordWAPL max(max. patchcord length)Figure 1 Cell sizing (wireless access point placed anywhere inside the cell) To allow placement of the wireless access point anywhere within the cell, the maximum length of the patch cord is given by: L
48、max= R = 0.707 X (1) where Lmaxis the maximum patch cord length between the TO and wireless access point; R is the radius of the circle circumscribing the cell; X is the size of the square cell. Once the maximum length of the patch cord between the TO and the wireless access point is known (Lmax), t
49、he next step is to determine the maximum horizontal length from the telecommu-nications room (TR) or telecommunications enclosure (TE) to the TO (Hmax). A maximum of 6 m (20 ft) should account for the cross connects and equipment cords in the TR or TE. It should be noted that the maximum length of the horizon
