1、 TSB-5021 January 2017Guidelines for the Use of Installed Category 5e and Category 6 Cabling to Support 2.5GBASE-T and 5GBASE-T NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, faci
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20、e of installed category 5e and category 6 cabling to support 2.5GBASE-T and 5GBASE-T TABLE OF CONTENTS 1 INTRODUCTION 3 2 SCOPE . 3 3 REFERENCES . 3 4 DEFINITIONS, ACRONYMS parties to agreements based upon this TSB are encouraged to investigate the possibility of applying the most recent edition of
21、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-568-C.2-1. Balanced Twisted-Pair Telecommunications Cabling and Components Standa
22、rd, Addendum 1: Specifications for 100 Category 8 Cabling ANSI/TIA-1152-A, Requirements for Field Test Instruments and Measurements for Balanced Twisted-Pair Cabling, 2016 TIA TSB-162-A, Cabling Guidelines for Wireless Access Points, 2016. TIA TSB-184-A Guidelines for Supporting Power Delivery Over
23、Balanced Twisted-Pair Cabling (draft) IEEE Std 802.3bz Standard for Ethernet Amendment: Physical Layer and Management Parameters for 2.5 Gb/s and 5 Gb/s Operation, Types 2.5GBASE-T and 5GBASE-T TIA TSB-5021 4 4 DEFINITIONS, ACRONYMS & ABBREVIATIONS 4.1 Definitions For the purpose of this Standard th
24、e 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, or component to a disturbed pair of another 4-pair channel, permanent link, or component. alien far-end crosstalk lo
25、ss: 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 limited signal-to-noise ratio: Ratio derived from measurements of the cable insertion
26、loss and alien crosstalk. alien near end crosstalk loss: 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. attenuation to alien crosstalk ratio far-e
27、nd: 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 the disturbed pair in another 4-pair channel, permanent link, or component. alien near-end crosstalk loss, power sum: The power sum of th
28、e 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. cable bundle: A group of cables that are tied together or in contact with on
29、e another in a closely packed configuration for at least 1 m. power sum 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 inser
30、tion loss of a disturbed pair in another 4-pair channel, permanent link, or component. unbundle: To re-arrange a grouping of cables by physical separation. 4.2 Acronyms and abbreviations AACRF Attenuation to alien crosstalk ratio far-end ACRF Attenuation to crosstalk ratio, far-end AFEXT Alien far-e
31、nd crosstalk ALSNR Alien limited signal to noise ratio ANEXT Alien near-end crosstalk FEXT Far-end crosstalk loss IL Insertion loss PBO Power back-off PSAACRF Power sum attenuation to alien crosstalk ratio far-end PSACRF Power sum attenuation to crosstalk ratio, far-end PSANEXT Power sum alien near-
32、end crosstalk PSD Power spectral density SNR Signal to noise ratio WAP Wireless access point TIA TSB-5021 5 4.3 Units of measure dB decibel dBm power ratio in decibels referenced to one milliwatt C degree Celsius F degrees Fahrenheit ft feet, foot MHz megahertz m meter ohm TIA TSB-5021 6 5 TEST CONF
33、IGURATIONS The following guidelines are for the assessment of the channel transmission and alien crosstalk parameters. 5.1 Channel test configuration (topology) Note: Test configurations and modeling methodologies to include bundling lengths for alien crosstalk considerations where applicable. The f
34、ocus will be on deployed topologies. Figure 1 - Channel test configuration Legend Cables and cords Connecting hardware Work area cord A Telecommunications outlet/ Optional consolidation point cabling B connector . TO Horizontal cabling . C Optional consolidation Patch cord or jumper cable . D point
35、connector CP Telecommunications room Horizontal cross-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 equipment A B C D E Test equipment CP TO C1 C2 Channel under test TIA TSB-5021 7 Figure 2 - Schematic representation of a channe
36、l alien crosstalk test configuration Legend Cables and cords Connecting hardware Work area cord A Telecommunications outlet/ Optional consolidation point cabling . B connector . TO Horizontal cabling C Optional consolidation Patch cord or jumper cable . D point connector CP Telecommunications room H
37、orizontal cross-connect or equipment cord . E interconnect . C1, C2 Test instrument CP TO CP 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-5021 8 6 INTERNAL TRANSMISSION PARAMETERS In order to meet the requirements of 2.5GBASE-T and 5GBASE-T, the t
38、ransmission parameters in Clause 6 and the alien limited signal to noise ratio (ALSNR) calculations in Clause 7 are applicable. Within Clause 6, category 5e transmission parameters, as specified in TIA-568-C.2 from 1 to 100 MHz are characterized for 2.5GBASE-T. Transmission parameters based upon Cat
39、egory 5e specified in TIA-568-C.2 are characterized up to 250 MHz for support of 5GBASE-T. Category 6 transmission parameters, as specified in TIA-568-C.2 from 1 to 250 MHz, meet these extrapolated parameters in Clause 6. A category 6A or higher system would exceed all transmission parameters in Cla
40、use 6 and Clause 7. Table 1 - Installed cabling system meets clause 6 internal transmission requirements Type 2.5GBASE-T 5GBASE-T Installed category 5e YES Frequency requirements are greater than category 5e specified range. Perform field testing or consult cable manufacturer Installed category 6 YE
41、S YES Note: These channel performance parameters are consistent with IEEE 802.3bz physical layer link segment performance specifications. All parameters in clause 6 apply up to the upper frequency of the applications. For 2.5GBASE-T the upper frequency is 100 MHz and for 5GBASE-T the upper frequency
42、 is 250 MHz. Table 2 - Frequency range of measurements Application Frequency range 2.5GBASE-T 1 f 100 MHz 5GBASE-T 1 f 250 MHz 6.1 Insertion loss Channel insertion loss should meet or be less than the values determined using equation 1 for all specified frequencies. ffff 04.04)05.002 3.096 7.1(02.1
43、(1) Note: For the purposes of field measurements, calculated channel limits that result in insertion loss values less than 3 dB revert to 3 dB maximum (see ANSI/TIA-1152). TIA TSB-5021 9 The channel insertion loss values in Table 3 are provided for information only. Table 3 - Maximum channel inserti
44、on loss Frequency (MHz) Insertion loss (dB) 1.00 2.2 4.00 4.5 8.00 6.3 10.00 7.1 16.00 9.1 20.00 10.2 25.00 11.4 31.25 12.9 62.50 18.6 100.00 24.0 200.00 35.3 250.00 40.1 6.2 Return loss Channel return loss should meet or exceed the values determined using the equations shown in Table 4 for all spec
45、ified frequencies. Table 4 - Channel return loss Frequency (MHz) Return loss (dB) 1 f 20 20 f 250 17 17 10log( f /20) The channel return loss values in Table 5 are provided for information only. Table 5 - Minimum channel Return Loss Frequency (MHz) return loss(dB) 1.00 17.0 4.00 17.0 8.00 17.0 10.00
46、 17.0 16.00 17.0 20.00 17.0 25.00 16.0 31.25 15.1 62.50 12.1 100.00 10.0 200.00 7.0 250.00 6.0 TIA TSB-5021 10 6.3 NEXT loss Channel NEXT loss should meet or exceed the values determined using the equations shown in Table 6 for all specified frequencies. Calculations that result in channel NEXT loss
47、 values greater than 60 dB revert to a requirement of 60 dB minimum. Table 6 - Channel NEXT loss Frequency (MHz) NEXT loss (dB) 1 f 100 20)100/l o g (2043(10220)100/l o g (153.35(10l o g20ff100 f 250 20)100/l o g (4043(10220)100/l o g (153.35(10l o g20ffThe channel NEXT loss values in Table 7 are pr
48、ovided for information only. Table 7 - Minimum channel NEXT loss Frequency (MHz) NEXT loss (dB) 1.00 60.0 4.00 53.5 8.00 48.6 10.00 47.0 16.00 43.6 20.00 42.0 25.00 40.3 31.25 38.7 62.50 33.6 100.00 30.1 200.00 21.4 250.00 18.2 TIA TSB-5021 11 6.4 PSNEXT loss Channel PSNEXT loss should meet or excee
49、d the values determined using the equations shown in Table 8 for all specified frequencies. Calculations that result in channel PSNEXT loss values greater than 57 dB revert to a requirement of 57 dB minimum. Table 8 - Channel PSNEXT loss Frequency (MHz) PSNEXT loss (dB) 1 f 100 20)1 0 0/l o g (2040(10220)1 0 0/l o g (153.32(10l o g20ff100 f 250 20)1 0 0/l o g (4040(10220)1 0 0/l o g (153.32(10l o g20ffThe channel PSNEXT loss v
