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1、 Recognized as an American National Standard (ANSI) The Institute of Electrical and Electronics Engineers, Inc. 345 East 47th Street, New York, NY 10017-2394, USA Copyright 1996 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 1996. Printed in the United
2、States of America ISBN 1-55937-714-3 No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. IEEE Std 743-1995 (Revision of IEEE Std 743-1984) IEEE Standard Equipment Requirements and Measuremen
3、t Techniques for Analog Transmission Parameters for Telecommunications Sponsor Transmission Systems and Access Committee of the IEEE Communications Society Approved 12 December 1995 IEEE Standards Board Approved 16 July 1996 American National Standards Institute Abstract: Performance requirements fo
4、r test equipment that measures the analog transmission pa- rameters of subscriber loops, message trunks, PBX trunks, and ties lines are specified. Require- ments for these measurements with DS1 bit stream access are also provided. The measurement of loss, noise, and impulse noise on non-loaded cable
5、 pairs used for digital subscriber lines is addressed. Keywords: active speech level, ADSL, amplitude jitter, digital bit stream access, digital subscriber lines, dropouts, echo canceller and suppressor disabling, echo path loss and delay, envelope delay distortion, frequency shift, gain hits, HDSL,
6、 impulse noise, intermodulation distortion, ISDN, loss, network impulse response, noise, phase hits, phase jitter, return loss, round trip delay, signal-to- total-distortion ratio, timing offset, twenty-three-tone measurements Copyright The Institute of Electrical and Electronics Engineers, Inc. Pro
7、vided by IHS under license with IEEELicensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 01:28:09 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Com- mittees of the IEEE
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20、e, 02/02/2009 01:28:09 MSTNo reproduction or networking permitted without license from IHS -,-,- iii Introduction (This introduction is not part of IEEE Std 743-1995, IEEE Standard Equipment Requirements and Measurement Techniques for Analog Transmission Parameters for Telecommunications.) The provi
21、sion of standard technical requirements for analog transmission measuring equipment is intended to assure comparable measurement results and proper interworking between different test equipments. It is not necessary that all the measurements specied be provided in one piece of test equipment; a manu
22、facturer may choose to provide only a subset of the measurements specied in this standard. The purpose of this standard is to provide technical requirements for the generation and measurement of analog transmission signals used to characterize the telecommunications network. Such characterization in
23、cludes measurement of various impairments to voiceband (204000 Hz) signals (speech and data) at both analog and PCM access points. This standard also provides lters for the extended frequency range of signals now carried on a traditional analog twisted copper cable pair between the central ofce and
24、the customer premises. These lters permit level, noise and impulse noise measurements on lines providing digital transmission for the Integrated Ser- vices Digital Network (ISDN), the High-bit-rate Digital Subscriber Line (HDSL), and the Asymmetric Digi- tal Subscriber Line (ADSL). The traditional C
25、-Message weighting is intended to be used only for voice- related measurements, and a new data lter (D Filter) is intended to be used for voice-frequency digitally- related measurements. Other lters that have been replaced or deleted are listed. The initial issue of this standard, IEEE Std 743-1984,
26、 IEEE Standard Methods and Equipment for Measur- ing the Transmission Characteristics of Analog Voice Frequency Circuits, was based on AT or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain course of action is deprecated but not proh
27、ibited (should equals is recommended that). The word may is used to indicate a course of action is permissible within the limits of the standard (may equals is permitted). 1.5 Annexes All of the annexes to this standard are informative, and are included in the standard for information purposes only.
28、 1.6 References This standard shall be used in conjunction with the following published standards. When the following stan- dards are superseded by an approved revision, the revision shall apply. ANSI/EIA/TIA 232-E-1991, Interface between Data Terminal Equipment and Data CircuitTerminating Equipment
29、 Employing Serial Binary Data Interchange, July 1991. 1 ANSI/EIA/TIA 530-A-1992, High-Speed 25-Position Interface for Data Terminal Equipment and Data Cir- cuit-Terminating Equipment, Including Alternative 26-Position Connector. ANSI T1.102-1993, American National Standard for TelecommunicationsDigi
30、tal HierarchyElectrical Interfaces. ANSI T1.221-1995, American National Standard for TelecommunicationsOperations, Administration, Maintenance, and Provisioning (OAM those sources being the timing basis from which signals and sampling are derived and analyzed (usually expressed propor- tionally in p
31、arts per million). Timing offset will cause a uniform percentage change in signal frequencies. 2.1.39 tone-to-C-Notched noise ratio: The ratio in dB of the incoming holding tone power to the C- Notched noise power at the point of measurement. The incoming holding tone power is reduced in power by at
32、 least 50 dB by the 1010 Hz Notch. 2.1.40 tone-to-D-Notched noise ratio: The ratio in dB of the incoming holding tone power to the D-Notched noise power at the point of measurement. The incoming holding tone power is reduced in power by at least 50 dB by the 1010 Hz Notch. 2.1.41 total distortion: T
33、he summation of noise and distortion resulting from the application of a test signal (quantizing noise, phase jitter, intermodulation distortion, etc.), and the noise not related to the application of a test signal (background noise). 2.1.42 transmission level point (TLP): a point in a transmission
34、system at which the ratio is specied in dB of the power of a test signal at that point to the power of a signal at a reference point. The reference level point, called the zero transmission level point (0 TLP), is an arbitrary established point relative to which transmission levels at all other poin
35、ts are specied. A signal level of X dBm at the 0 TLP is designated X dBm0. 2.1.43 1 kHz envelope delay: The envelope delay at a carrier frequency of 1020 Hz. 2.2 Abbreviations and acronyms The following abbreviations and acronyms, commonly used in the communications eld, are used in this standard. S
36、ome are dened in 2.1. Listed with each abbreviation and acronym is the subclause in the remain- der of this standard where it is introduced. ADPCMAdaptive differential pulse code modulation (8.2.1) A/DAnalog-to-digital converter (8.7.3.3) ADSLAsymmetric Digital Subscriber Line (3.2.2) AFIRAdaptive n
37、ite impulse response lter (3.4.8) CRCCyclic redundancy check (4.2.2.5) D/ADigital-to-analog converter (8.7.3.3) dBm Decibels relative to 1 mW (6.1) dBm0Decibels relative to 1 mW, referred to a zero transmission level point (6.1) dBrn Decibels relative to 1 pW reference noise level (6.2) dBrnC Decibe
38、ls relative to 1 pW reference noise level, measured with a C-Message or C-Notch fre- quency weighting (6.2) dBrnD Decibels relative to 1 pW reference noise level, measured with a D Filter or D-Notch Filter (6.2) DFTDiscrete Fourier transform (8.6.1) DSLDigital subscriber line (3.2.2) DSPDigital sign
39、al processor (8.7.3.7) DRS Digital reference sequence for a 1013.8-Hz sine wave (5.3.3) EDDEnvelope delay distortion (3.4.1) Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=HP Monitoring/1111111164 Not for Resale, 02/02/2009 01:28
40、:09 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE Std 743-1995IEEE STANDARD EQUIPMENT REQUIREMENTS AND MEASUREMENT TECHNIQUES 8 ELEPLEqual level echo path loss (8.3) EPDEcho path delay (3.4.7) EPLEcho path loss (3.4.7) ERLEcho return loss (8.3) ESFExtended superframe
41、 format (4.2.2.2) HDSLHigh-bit-rate Digital Subscriber Line (3.2.2) IMDIntermodulation distortion (3.4.5) ISDNIntegrated Services Digital Network (3.2.2) ITU-T International Telecommunications UnionTelecommunications Standardization Sector (the former name is the CCITT) (3.2.2) LMSLeast mean squares
42、 algorithm (8.7.2) LSBLeast signicant bit (4.2.2.2) NIRNetwork impulse response (3.4.8) P/ARPeak-to-average ratio (3.4.10) PCMPulse code modulation (4.2.1) RLReturn loss (8.3) S/NSignal-to-noise ratio (4.2.2.4) SRLSinging return loss (8.3) S/TDSignal-to-total-distortion ratio (3.2.3) TLPTransmission
43、 level point (4.2.2.2) T/TDTone-to-total-distortion ratio (3.2.3) 2nd IMDSecond-order intermodulation distortion (8.6.5) 3rd IMDThird-order intermodulation distortion (8.6.5) 3. General descriptions of measurements 3.1 Digitally-encoded measurements The scope of this standard includes measurement of
44、 analog signals that have been sampled, quantized, and encoded in digital bit streams. Measurements of such signals will be accomplished by mathematically pro- cessing the train of sampled signal values represented by the digital bit stream. The formats and characteris- tics of the digital signals t
45、reated by this standard are specied in 4.2. 3.2 Steady-state measurements using a tone or quiet termination 3.2.1 Level and attenuation distortion This is a measurement of signal power at an access point of nominal impedance in a circuit. The impedance may range from 100 W to 900 W, with 600 W most
46、commonly used. The expected signal levels at the access points usually range from 40 dBm to +15 dBm. The frequency range of interest for normal speech and voiceband data services may extend from below 60 Hz to above 4 kHz. Wide-band data circuits further extend this range. The requirements for level
47、 mea- surement with a sinusoidal tone are given in 6.1. The requirements for frequency response (or attenuation distortion) measurements with a 23-tone test signal are given in 8.6.2. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicense
48、e=HP Monitoring/1111111164 Not for Resale, 02/02/2009 01:28:09 MSTNo reproduction or networking permitted without license from IHS -,-,- IEEE FOR ANALOG TRANSMISSION PARAMETERS FOR TELECOMMUNICATIONSStd 743-1995 9 3.2.2 Noise Noise measurements can be made with the channel or cable pair terminated i
49、n its nominal impedance and no test signal on the channel. These noise measurements are made using one of several frequency weighting networks/lters (see clause 9). These include: a)C-Message. A frequency weighting that weights the noise according to its perceived annoyance to a typical listener, of standard telephone service. b)C-Notch. C-Message weighting with the addition of a narro