1、ANSI/TIA/EIA-568-B.2-2-2001 Approved: December 26, 2001 TIA/EIA STANDARD Commercial Building Telecommunications Cabling Standard Part 2: Balanced Twisted Pair Cabling Components Addendum 2 TIMEIA-5 68-B .2-2 (Addendum No. 2 to TIA/EIA-568-B.2) DECEMBER 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Th
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7、blish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal Nos.3-4426-AD2, formulated under the cognizance of the TIA TR-42 Committee on User Premises Telecommunications Infrastructure.) Published by TELECOMMUNI
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19、CH LIMITATIONS. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINEIA-568-B.2-2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Add
20、endum No. 2 to TINEIA-568-B.2 Purpose: The purpose of this addendum is to revise sub-clauses 4.3.4.8, 4.4, 4.4.1, 4.4.4.9, and 5.4.3 of TINEIA-568-B.2. These revisions are identified in the following text with additions shown in bold italics and deletions shown as strikeout. Revisions: 4.3.4.8 Repla
21、ce equation (5) with: NEXcaf3- cable - NEXT(16)-1510g(f/l6)dB 4.4 Add introductory text as follows: Four-pair IOO-ohm twisted-pair cables that comply with the requirements of clause 4.3 and multipair backbone cables that comply with the requirements of clauses 4.4.1 through 4.4.6 are recognized for
22、use in backbone cabling system. 4.4.1 Multipair backbone cable Innnr?l rrrnrnrlhnrninquirements for multipair backbone cables in pair sizes greater than 4 pairs are specified in clause 4.4. I through 4.4.6 i. 4.4.4.9 Revise category 3 values in table 13 as follows: Table 1 - Backbone cable PSNEXT lo
23、ss 20 “C f 3 “C (68 OF f 5.5“F) For Frequency 0.772 1 .o 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 (MW engt h of 1 O0 m (: Category 3 43. O 41.3 32.3 27.8 26.3 23.2 (dB) 18 fi) Category 5e 64.0 62.3 53.3 48.8 47.3 44.2 42.8 41.3 39.9 35.4 32.3 (dB) 35 1 Copyright Telecommunications Industry Assoc
24、iation Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TINEIA-568-B.2-2 1 5.4.3 2 3 4 5 6 7 NEXT(166) shall be 4-83 dB for category 3 connecting hardware. Revise category 3 values in table 20 as follows: Table 2 - Connecting ha
25、rdware NEXT loss, worst pair-to-pair Freq ue n cy (MW 1 .o 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 Category 3 58.10 46.0 40.0394 38.10 34. O 334 (dB) Category 5e 65.0 65.0 64.9 63.0 58.9 57.0 55.0 53.1 47.1 43.0 (dB) 8 2 Copyright Telecommunications Industry Association Provided by IHS under li
26、cense with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-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 with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
