1、 TSB-1197 September 2014Mode Conversion Parameters for Balanced Twisted Pair Cabling NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement
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19、 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA TSB-1197 i Mode Conversion Parameters for Balanced Twisted Pair Cabling TABLE O
20、F CONTENTS 1 PURPOSE AND SCOPE . 1 2 REFERENCES . 1 3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS, AND UNITS OF MEASURE . 1 3.1 General 1 3.2 Definition of terms . 1 3.3 Abbreviations and Acronyms 2 3.4 Units of measure . 2 4 MODE CONVERSION PARAMETERS . 3 4.1 General 3 4.2 Illustrations of mode convers
21、ion parameters 3 4.3 Noise coupling mechanisms . 7 4.4 Noise coupling mechanisms expressed in s-parameter notation. 18 4.5 Summation of noise coupling terms 19 5 MODELING RESULTS 20 5.1 Near end mode conversion data . 20 5.2 Far end mode conversion 21 5.3 Example ANEXTccdata between bundled cables .
22、 22 5.4 Reflected AFEXT modeling results . 23 5.5 Combined near end and far end mode conversion modeling results . 24 LIST OF FIGURES Figure 1 - Block diagram for TCL measurements . 4 Figure 2 - Block diagram for LCL measurements 4 Figure 3 - Block diagram for NEXTcdjiMeasurements . 5 Figure 4 - Blo
23、ck diagram for NEXTdcjiMeasurements . 5 Figure 5 - Block diagram for TCTL Measurements . 6 Figure 6 - Block diagram for LCTL Measurements . 6 Figure 7 - Block diagram for FEXTcdjiMeasurements . 7 Figure 8 - Block diagram for FEXTdcjiMeasurements . 7 Figure 9 - Reflected AFEXT from connectors on the
24、disturbed channel . 8 Figure 10 - Reflected AFEXT from connectors on the disturbing channel 8 Figure 11 - Channel configuration and variables . 9 Figure 12 - Near end mode conversion from connectors and ANEXTccbetween cables . 11 Figure 13 - Far end mode conversion from connectors and ANEXTccbetween
25、 cables 14 Figure 14 - Far end / near end mode conversion from connectors and AFEXTccbetween cables 16 Figure 15 - Near end / far end mode conversion from connectors and AFEXTccbetween cables 17 Figure 16 Port notation . 18 Figure 17 Near end mode conversion 20 Figure 18 Far end mode conversion 21 F
26、igure 19 CM to CM ANEXT between pairs for 50 m cable bundle . 22 Figure 20 Contribution of PSANEXT due to reflected AFEXT . 23 Figure 21 Contribution of PSANEXT due to near end and far end mode conversion 24 TIA TSB-1197 ii LIST OF TABLES Table 1 - DM, CM and mixed mode parameters expressed using S-
27、parameter notation . 18 Table 2 - DM, CM and mixed mode parameters as defined in TIA standards 18TIA TSB-1197 iii FOREWORD (This foreword is not part of the Telecommunications Systems Bulletin) This Telecommunications Systems Bulletin was developed by TIA Subcommittee TR-42.7. Approval of this TSB T
28、his Telecommunications Systems Bulletin was approved by TIA Subcommittee TR-42.7 and TIA Engineering Committee TR-42. TIA reviews standards every 5 years. At that time, standards are reaffirmed, withdrawn, or revised according to the submitted updates. Updates to be included in the next revision sho
29、uld be sent to the committee chair or to TIA. Contributing organizations More than 30 organizations within the telecommunications industry contributed their expertise to the development of this Bulletin (including manufacturers, consultants, end users, and other organizations). Introduction This Tel
30、ecommunications Systems Bulletin (TSB) provides information on balance and mode conversion parameters. These parameters are relevant to understanding noise coupling mechanisms for balanced twisted-pair cabling including alien crosstalk and other sources of external noise. Stewardship Telecommunicati
31、ons infrastructure affects raw material consumption. The infrastructure design and installation methods also influence product life and sustainability of electronic equipment life cycling. These aspects of telecommunications infrastructure impact our environment. Since building life cycles are typic
32、ally planned for decades, technological electronic equipment upgrades are necessary. The telecommunications infrastructure design and installation process magnifies the need for sustainable infrastructures with respect to building life, electronic equipment life cycling and considerations of effects
33、 on environmental waste. Telecommunications designers are encouraged to research local building practices for a sustainable environment and conservation of fossil fuels as part of the design process. . Specification of criteria This TSB is informative and does not contain normative requirements. A n
34、ote in the text, table, or figure is used for emphasis or offering informative suggestions, or providing additional information.TIA TSB-1197 1 1 PURPOSE AND SCOPE This bulletin develops a model that explains the interaction between mode conversion parameters within a pair (TCL,LCL, TCTL and LCTL), m
35、ode conversion parameters between pairs (NEXTdc , NEXTcd, FEXTdc, FEXTcd) and other common mode parameters (NEXTcc, FEXTcc, ILcc, RLcc) on the alien crosstalk between channels. This bulletin also provides an assessment of the performance of category 6A UTP mode conversion parameters for cabling and
36、components. This bulletin includes methods used to evaluate these parameters. These parameters are relevant to understanding noise coupling mechanisms for balanced twisted-pair cabling (including alien crosstalk and other sources of external noise. It is not the intent of this bulletin to specify pe
37、rformance recommendations for these parameters. 2 REFERENCES The following standards contain provisions that, through reference in this TSB, constitute provisions of this TSB. At the time of publication, the editions indicated were valid. All standards are subject to revision; parties to agreements
38、based upon this TSB are encouraged to investigate the possibility of applying the most recent edition of 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
39、Standard, 2009 ANSI/TIA-1183, Measurement Methods and Test Fixtures for Balun-less Measurements of Balanced Components and Systems, 2012 3 DEFINITIONS, ACRONYMS AND ABBREVIATIONS, AND UNITS OF MEASURE 3.1 General For the purpose of this TSB the following definitions, acronyms, abbreviations and unit
40、s of measure apply 3.2 Definition of terms 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 loss: The unwanted signal coupling fr
41、om 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 loss: Unwanted signal coupling from a disturbing pair of a 4-pair channel, permanent link, or componen
42、t to a disturbed pair of another 4-pair channel, permanent link, or component, measured at the near-end. cabling: A combination of all cables, jumpers, cords, and connecting hardware. far-end crosstalk loss: A measure of the unwanted signal coupling from a transmitter at the near end into another pa
43、ir measured at the far end, and relative to the transmitted signal level. insertion loss: The signal loss resulting from the insertion of a component, or link, or channel, between a transmitter and receiver (attenuation is insertion loss under matched conditions). link: A transmission path between t
44、wo points, not including equipment, and cords. longitudinal conversion loss: A ratio, expressed in dB, of measured differential voltage relative to the common mode voltage on the same conductor pair applied at the same end. cord (telecommunications): An assembly of cord cable with a plug on one or b
45、oth ends.TIA TSB-1197 2 longitudinal conversion transfer loss: A ratio, expressed in dB, of measured differential voltage at one end of a conductor pair relative to the common mode voltage applied on any pair at the opposite end or on any other pair on the same end. power sum alien near-end crosstal
46、k: 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 attenuation to crosstalk ratio far end: A co
47、mputation of the unwanted signal coupling from multiple transmitters at the near-end into a pair measured at the far-end, and normalized to the received signal level. return loss: A ratio expressed in dB of the power of the outgoing signal to the power of the reflected signal. screen: An element of
48、a cable formed by a shield. telecommunications: Any transmission, emission, and reception of signs, signals, writings, images, and sounds, that is, information of any nature by cable, radio, optical, or other electromagnetic systems. transverse conversion loss: A ratio, expressed in dB, of the measu
49、red common mode voltage on a pair relative to the differential mode voltage on the same pair applied at the same end. transverse conversion transfer loss: A ratio, expressed in dB, of the measured common mode voltage on a pair relative to the differential mode voltage applied at the opposite end of the same pair, or on either end of another pair. 3.3 Abbreviations and Acronyms AFEXT alien far-end crosstalk ANEXT alien near-end crosstalk ANSI American National Standards Institute CM common mode DM differential mode DUT device under test FEXT far-end crosstalk IL insertion lo
