1、 TIA STANDARD ANSI/TIA-568-B.1-7-2006Approved: January 13, 2006 Commercial Building Telecommunications Cabling Standard Part 1 - General Requirements Addendum 7 Guidelines for Maintaining Polarity Using Array ConnectorsTIA-568-B.1-7 (Addendum No.7 to TIA-568-B.1) January 2006 TELECOMMUNICATIONS INDU
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21、 SUCH LIMITATIONS. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 i Guidelines for Maintaining Polarity Using Array Connectors, Addendum 7 to ANSI/TIA/EIA/568B.1
22、Table of Contents FOREWORD .iv 1 INTRODUCTION . 1 2 SCOPE 2 3 CONNECTIVITY METHODS FOR ESTABLISHING POLARITY 2 3.1 General 2 3.1.1 Descriptions . 2 3.2 Connectivity Method A. 3 3.2.1 Connectivity Method A for Duplex Signals 3 3.2.2 Connectivity Method A for Parallel Signals 5 3.3 Connectivity Method
23、 B. 7 3.3.1 Connectivity Method B for Duplex Signals 7 3.3.2 Connectivity Method B for Parallel Signals 9 3.4 Connectivity Method C 11 3.4.1 Connectivity Method C for Duplex Signals 11 4 GUIDELINES FOR CONNECTIVITY COMPONENTS . 13 4.1 General 13 4.2 Components for Connectivity Method A 14 4.2.1 Type
24、-A Array Connector Cables and Patch Cords 14 4.2.2 Type-A Array Adapters 14 4.2.3 Transitions . 15 4.2.4 A-to-B patch cords. 16 4.2.5 A-to-A Patch cords. 16 4.3 Components for Connectivity Method B 17 4.3.1 Type-B Array Connector Cables and Patch Cords 17 4.3.2 Type-B Array Adapters 17 4.3.3 Transit
25、ions . 17 4.3.4 A-to-B patch cords. 17 4.4 Components for Connectivity Method C 18 4.4.1 Type-C Array Connector Cables . 18 4.4.2 Type-A Array Adapters 18 4.4.3 Transitions . 18 4.4.4 A-to-B patch cords. 18 ANNEX A (INFORMATIVE) References . 19 Copyright Telecommunications Industry Association Provi
26、ded by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 ii List of Figures Figure 1: Connectivity Method A for Duplex Signals.4 Figure 2: Connectivity Method A for Parallel Signals6 Figure 3: Connectivity Method B for Duplex S
27、ignals.8 Figure 4: Connectivity Method B for Parallel Signals10 Figure 5: Connectivity Method C for Duplex Signals.12 Figure 6: Type-A Array Connector Cable or Patch Cord (key-up to key-down) 14 Figure 7: Transition .15 Figure 8: A-to-B Duplex Patch Cord16 Figure 9: A-to-A Duplex Patch Cord16 Figure
28、 10: Type-B Array Connector Cable or Patch Cord (key-up to key-up).17 Figure 11: Type C Array Connector Cable (pair-wise flipped, key-up to key-down) .18 List of tables Table 1: Summary of Components Used for Duplex Signals13 Table 2: Summary of Components Used for Parallel Signals.13 Copyright Tele
29、communications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 iII FOREWORD (This foreword is not part of this Standard) After ANSI/TIA/EIA-568-B.1 was approved for publication, it was realize
30、d that there was a need to explain and illustrate the concept of maintaining optical fiber polarity using array connectors. The TIA TR-42 Engineering Committee on Premises Telecommunications Cabling Infrastructure accepted the task and assigned it to the TR-42.8 Subcommittee, Telecommunications Opti
31、cal Fiber Cabling Systems. The TR-42.8 Subcommittee cooperated with the TR-42.1 Subcommittee on Commercial Building Cabling, which is related to this activity, in preparing this document. TIA standards are developed within the Technical Engineering Committees of the TIA and the standards coordinatin
32、g committees of the TIA standards board. Members of the committees serve voluntarily and without commission. The companies that they represent are not necessarily members of the TIA. The standards developed within the TIA represent a consensus of the broad expertise on the subject. This expertise co
33、mes from within the TIA as well as those outside of the TIA that have an expressed interest. The viewpoint expressed at the time that this Telecommunication Systems Bulletin was approved was from the contributors experience and the state of the art at that time. Users are encouraged to verify that t
34、hey have the latest revision of the standard. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license wit
35、h EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 1 1 INTRODUCTION To support bi-directional communication systems that use separate optical fibers in each direction, the cabling system must provide correct signal polarity so that the transmitter o
36、n one end of the channel will connect to the receiver on the other end. Maintaining the correct transmit-to-receive polarity throughout the cabling system is critical for system operation. Following certain cable polarity guidelines when installing the cabling system will simplify channel connectivi
37、ty. Correct polarity is administered according to the requirements of the depicted methods. Intermixing the components of these methods may result in incorrect polarity. The increasing use of optical connectivity in data communications networks (particularly in areas of highly concentrated equipment
38、, such as data centers) is driving the need for more compact forms of connectivity. Array connectors are one way of meeting this need. Since the polarity requirements for array connectors extend beyond the commonly deployed duplex (A-B) polarity, additional guidance is provided in this addendum for
39、maintaining polarity of networks utilizing array connectors. For illustrative purposes, the figures throughout this document depict the MPO array connector and 568SC duplex connector. Other connector types are permitted, provided the fiber ordering arrangement is maintained relative to the plugs key
40、ing features, as shown in the figures. The figures in this document show connectors labeled with fiber position numbers. This is done for reference only; it is not a requirement of this standard that connectors be labeled with a fiber number. Copyright Telecommunications Industry Association Provide
41、d by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 2 2 SCOPE This Standard provides guidelines for establishing transmit-to-receive polarity using array connectors. The methods presented in this document provide different o
42、ptions for implementing polarity. Once a method is selected the details in that method shall be followed. 3 CONNECTIVITY METHODS FOR ESTABLISHING POLARITY 3.1 General All connectivity methods have the same goal: to create an optical path from the transmit port of one device to the receive port of an
43、other device. Different methods to accomplish this goal may be implemented; however these different methods may not be interoperable. It is recommended that a method be selected in advance and maintained consistently throughout an installation. While many methods are available to establish polarity,
44、 this Standard outlines sample methods that may be employed. For convenience, these sample methods are referred to as Methods A, B, and C. No preference or priority is implied by this notation. When mating connectors that use alignment pins (such as the MPO and MT-RJ) it is critical that one plug is
45、 pinned and the other plug is unpinned. The pinned connector is typically located inside the panel. That is, the connector that stays in place is pinned; the connector that is frequently removed the transceiver would be mounted key up as normal. A-to-B Patch CordsType-B Array Connector CableExample
46、Optical PathCopyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 9 3.3.2 Connectivity Method B for Parallel Signals Implementation of Connectivity Method B for parallel
47、 signals is shown in Figure 4. When connecting parallel signals, the Type-B backbone (composed of one or many Type-B array connector cables mated in Type-B adapters) is connected on each end to a patch panel. Type-B array patch cords are then used to connect the patch panel ports to their respective
48、 parallel transceiver ports. Guidelines for the construction of the cabling components used to implement Method B for parallel signals are given in Section 4.3. When MPO connectors are used in Connectivity Method B they must be flat polished. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.1-7 10 Figure 4: Connectivity Method B for Parallel Signals NOTE 1. This Connectivity Method will also work with other parallel optics devices. Example Optical PathType-B
