1、 TIA STANDARD Guidelines for the Assessment and Mitigation of Installed Category 6 Cabling to Support 10GBASE-T TSB-155 March 2007 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electronic Industries Alliance Copyright Telecommunications
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24、ULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TSB-155 iGUIDELINES FOR THE ASSESSMENT AND MITIGATION OF INSTALLED CATEGORY
25、 6 CABLING TO SUPPORT 10GBASE-T TABLE OF CONTENTS 1 INTRODUCTION 1 2 PURPOSE AND SCOPE1 3 REFERENCES .1 4 DEFINITIONS, ACRONYMS parties to agreements based on this TSB are encouraged to investigate the possibility of applying the most recent editions of the standards indicated. ANSI and TIA maintain
26、 registers of currently valid national standards published by them. ANSI/TIA/EIA-568-B.1, Commercial Building Telecommunications Cabling Standard Part 1: General Requirements ANSI/TIA/EIA-568-B.2, Commercial Building Telecommunications Cabling Standard Part 2: 100 Ohm Balanced Twisted-pair Cabling C
27、omponents ANSI/TIA/EIA-568-B.2-1, Transmission Performance Specifications for 4 Pair 100 Ohm Category 6 Cabling Components Addendum 1 Transmission Performance Specifications for 4-pair 100 Category 6 Cabling ANSI/TIA/EIA-568-B.2-10, Transmission Performance Specifications for 4 Pair 100 Ohm Augmente
28、d Category 6 Cabling Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TSB-155 24 DEFINITIONS, ACRONYMS & ABBREVIATIONS 4.1 Definitions The generic definitions in this section hav
29、e been formulated for use by the entire family of telecommunications infrastructure standards. alien crosstalk: Unwanted signal coupling from a disturbing pair of a 4-pair channel, permanent link, or component to a disturbed pair of another 4-pair channel, permanent link, or component. alien far-end
30、 crosstalk (AFEXT): The unwanted signal coupling from a disturbing pair of a 4-pair channel, permanent link, or component to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the far-end. alien near-end crosstalk (ANEXT): Unwanted signal coupling from a disturbing
31、 pair of a 4-pair channel, permanent link, or component to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the near-end. attenuation to alien crosstalk ratio at the far end (AACRF): The difference in dB between the alien far-end crosstalk from a disturbing pair
32、of a 4-pair channel, permanent link, or component and the insertion loss of a disturbed pair in another 4-pair channel, permanent link, or component. average power sum alien near end crosstalk loss: The calculated average of the power sum alien near-end crosstalk loss of the four pairs of the distur
33、bed channel or permanent link. average power sum attenuation to alien crosstalk ratio far-end: The calculated average of the power sum attenuation to alien crosstalk ratio far-end of the four pairs of the disturbed channel or permanent link. power sum alien far-end crosstalk (PSAFEXT): The power sum
34、 of the unwanted signal coupling from multiple disturbing pairs of one or more 4-pair channels, permanent links, or components to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the far-end. power sum alien near-end crosstalk (PSANEXT): The power sum of the unwa
35、nted signal coupling from multiple disturbing pairs of one or more 4-pair channels, permanent links, or components to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the near-end. power sum attenuation to alien crosstalk ratio at the far end (PSAACRF): The diffe
36、rence in dB between the power sum alien far-end crosstalk from multiple disturbing pairs of one or more 4-pair channels, permanent links, or components, and the insertion loss of a disturbed pair in another 4-pair channel, permanent link, or component. Note: The definition of power sum attenuation t
37、o alien crosstalk ratio far-end (PSAACRF) as used in this guideline corresponds to PSAELFEXT in IEEE 802.3an 10GBASE-T. This guideline also uses AACRF (attenuation to alien crosstalk ratio far-end) which corresponds to AELFEXT in IEEE 802.3an 10GBASE-T. 4.2 Acronyms and abbreviations AELFEXT Alien e
38、qual level far-end crosstalk AFEXT Alien far-end crosstalk ANEXT Alien near-end crosstalk AACRF Attenuation to alien crosstalk ratio far-end PSAACRF Power sum attenuation to alien crosstalk ratio far-end Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for
39、ResaleNo reproduction or networking permitted without license from IHS-,-,-TSB-155 3PSAELFEXT Power sum alien equal level far-end crosstalk PSAFEXT Power sum alien far-end crosstalk PSANEXT Power sum alien near-end crosstalk 5 TEST CONFIGURATIONS The following guidelines are for the assessment of th
40、e channel and permanent link transmission parameters over the frequency range of 1 MHz to 500 MHz. 5.1 Channel test configuration The channel test configuration is used to verify the performance of the channel. The channel includes up to 90 m (295 ft) of horizontal cable, a work area cord, a telecom
41、munications outlet/connector, an optional consolidation point connector, two connections in the telecommunications room, and an equipment cord. The total length of equipment cords, patch cords or jumpers and work area cords does not exceed 10 m (32.8 ft). The channel configuration excludes the conne
42、ctions to the equipment at each end of the channel. The channel definition does not apply to those cases where the horizontal cabling is cross-connected to the backbone cabling. A schematic representation of the channel test configuration is illustrated in figure 1. Figure 1 Schematic representation
43、 of a channel test configuration 5.2 Permanent link test configuration The permanent link test configuration is used by installers and users of data telecommunications systems to verify the performance of permanently installed cabling. The permanent link consists of up to 90 m (295 ft) of horizontal
44、 cabling and one connection at each end and may also include an optional consolidation point connection. The permanent link configuration excludes both the cable portion of the test equipment cords and the connection to the test instruments. A schematic representation of the permanent link test conf
45、iguration is illustrated in Figure 2. Legend Cables and cords Connecting hardware Work area cordA Telecommunications outlet/ Optional transition cabling .B connector.TO Horizontal cablingC Optional consolidation Patch cord or jumper cable .D point connector CP Telecommunications room Horizontal cros
46、s-connect or equipment cord .E interconnect C1, C2 Maximum length B + C.90 m (295 ft) A + D + E.10 m (32.8 ft) Test instrument A B C D E Test instrument CP TO C1 C2 Channel under testCopyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction
47、 or networking permitted without license from IHS-,-,-TSB-155 4Figure 2 Schematic representation of a permanent link test configuration 5.3 Alien crosstalk test configurations The alien crosstalk test configurations consist of a disturbed channel or permanent link with one or more disturbing channel
48、s or permanent links in close proximity. The test configuration shown in figure 3 is a schematic representation of a single disturbed channel and a single disturbing channel. The test configuration shown in figure 4 is a schematic representation of a single disturbed permanent link and a single dist
49、urbing permanent link. Clause A.8 details the general test strategies for identifying multiple disturbing channels or permanent links for determination of multi disturber PSANEXT and PSAACRF. Figure 3 Schematic representation of a channel alien crosstalk test configuration Legend Cables and cords Connecting hardware Work area cordA Telecommunica
