1、 TSB-155-A-2010 APPROVED: MARCH 1, 2010 REAFFIRMED: OCTOBER 6, 2014 TSB-155-A March 2010Guidelines for the Assessment and Mitigation of Installed Category 6 Cabling to Support 10GBASE-T NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating mi
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20、sessment and Mitigation of Installed Category 6 Cabling to Support 10GBASE-T TABLE OF CONTENTS 1 INTRODUCTION 1 2 PURPOSE AND SCOPE 1 3 REFERENCES . 1 4 DEFINITIONs, ACRONYMS parties to agreements based upon this TSB are encouraged to investigate the possibility of applying the most recent edition o
21、f the Standard indicated. ANSI and TIA maintain registers of currently valid national standards published by them. ANSI/TIA-568-C.2, Balanced Twisted-Pair Telecommunications Cabling and Components Standard, 2009 ANSI/TIA-1152, Requirements for Field Test Instruments and Measurements for Balanced Twi
22、sted-Pair Cabling, 2009 4 DEFINITIONs, ACRONYMS & ABBREVIATIONS 4.1 Definitions For the purpose of this Standard the following definitions, acronyms, abbreviations, and units of measure apply. alien crosstalk: The unwanted signal coupling from a disturbing pair of a 4-pair channel, permanent link, o
23、r component to a disturbed pair of another 4-pair channel, permanent link, or component. alien far-end crosstalk: 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, measure
24、d at the far-end. alien near-end 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, measured at the near-end. TIA TSB-155-A 2attenuation to alien crosstalk ratio at
25、the far end: The difference in dB between the alien far-end crosstalk from a disturbing pair 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 calc
26、ulated average of the power sum alien near-end crosstalk loss of the four pairs of the disturbed 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 di
27、sturbed channel or permanent link. power sum alien far-end crosstalk: The power sum 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 t
28、he far-end. power sum alien near-end crosstalk: The power sum 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 near-end. power sum
29、 attenuation to alien crosstalk ratio at the far end: The difference 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
30、, or component. NOTE - The definition of power sum attenuation to alien crosstalk ratio far-end (PSAACRF) as used in this TSB corresponds to PSAELFEXT in IEEE 802.3an 10GBASE-T. This TSB also uses AACRF (attenuation to alien crosstalk ratio far-end) which corresponds to AELFEXT in IEEE 802.3an 10GBA
31、SE-T. 4.2 Acronyms and abbreviations AACRF Attenuation to alien crosstalk ratio far-end ACMC Alien crosstalk margin computation ACRF Attenuation to crosstalk ratio, far-end AELFEXT Alien equal level far-end crosstalk AFEXT Alien far-end crosstalk ANEXT Alien near-end crosstalk ELFEXT Equal level far
32、-end crosstalk FEXT Far-end crosstalk IL Insertion loss m meters ns nanoseconds PSAACRF Power sum attenuation to alien crosstalk ratio far-end PSACRF Power sum attenuation to crosstalk ratio, far-end PSAELFEXT Power sum alien equal level far-end crosstalk PSELFEXT Power sum equal level far-end cross
33、talk PSAFEXT Power sum alien far-end crosstalk PSANEXT Power sum alien near-end crosstalk ScTP Screened twisted-pair SNR Signal to noise ratio TIA TSB-155-A 35 TEST CONFIGURATIONS The following guidelines are for the assessment of the channel and permanent link transmission parameters over the frequ
34、ency 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 telecommunications outlet/connector, an optional consolidation point conne
35、ctor, 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 connections to the equipment at each end of the channel. The channel def
36、inition 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 of a channel test configuration 5.2 Permanent link test configur
37、ation 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 cabling and one connection at each end and may also include an o
38、ptional 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 configuration is illustrated in figure 2. Legend Cables and cords Con
39、necting hardware Work area cord A Telecommunications outlet/ Optional transition cabling . B connector . TO Horizontal cabling C Optional consolidation Patch cord or jumper cable D point connector CP Telecommunications room Horizontal cross-connect or equipment cord . E interconnect . C1, C2 Maximum
40、 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 test TIA TSB-155-A 4Figure 2 - Schematic representation of a permanent link test configuration 5.3 Alien crosstalk test configurations The alien crosstalk test configurations
41、consist of a disturbed channel or permanent link with one or more disturbing channels 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
42、is a schematic representation of a single disturbed permanent link and a single disturbing 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 rep
43、resentation of a channel alien crosstalk test configuration Legend Cables and cords Connecting hardware Work area cord A Telecommunications outlet/ Optional transition cabling . B connector . TO Horizontal cabling C Optional consolidation Patch cord or jumper cable . D point connector CP Telecommuni
44、cations room Horizontal cross-connect or equipment cord . E interconnect . C1, C2 Test instrument CP TO CP Legend Cables and cords Connecting hardware Test equipment cord F Telecommunications outlet/ Optional transition cabling . B connectorTO Horizontal cablingC Optional consolidation point connect
45、or.CP Horizontal cross-connect or InterconnectC1 Maximum length B + C . 90 m (295 ft) Test instrument F B C F Test instrument CP TO C1 Permanent link under test Test instrument C1 C2 C1 C2 TO C D A B A C D E E B Channel under test Channels under test TIA TSB-155-A 5Figure 4 - Schematic representatio
46、n of a permanent link alien crosstalk test configuration 10GBASE-T should operate over channel lengths of up to 37 meters of category 6 cabling, and should operate over channel lengths between 37 and 55 meters of category 6 cabling depending on the alien crosstalk environment. Channel lengths over 5
47、5 meters may require mitigation (see annex C). For unequal length channel configurations where the disturbed channel is less than or equal to 37 meters and the disturbing channel is greater than or equal to 45 meters, the disturbing channel alien crosstalk margin computation (ACMC) should pass befor
48、e its alien crosstalk is included in the ACMC calculation of the shorter length channel (see annex D). Alien crosstalk field testing procedures and alien crosstalk mitigation guidelines are addressed in annex A and annex C respectively. 6 ALIEN CROSSTALK CHANNEL COUPLING PARAMETERS 6.1 ANEXT loss AN
49、EXT loss is a measure of 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 near-end. Since each channel can be disturbed by more than one other channel in close proximity, power sum alien near-end crosstalk (PSANEXT) loss is provided. 6.1.1 Pair-to-pair ANEXT loss Pair-to-pair ANEXT measurements are used in the calculation of PSANEXT recommen
