GB/T 15838-2008 English PDF

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GB/T 15838-2008: Test methods for the performances of switching equipment clocks in digital network
Status: Valid

GB/T 15838: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15838-2008	579	Add to Cart	5 days	Test methods for the performances of switching equipment clocks in digital network	Valid
GB/T 15838-1995	559	Add to Cart	4 days	Measuring methods for the performances of switching equipment clocks in digital synchronous network	Obsolete

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Basic data

Standard ID: GB/T 15838-2008 (GB/T15838-2008)
Description (Translated English): Test methods for the performances of switching equipment clocks in digital network
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: M15
Classification of International Standard: 33.040.30
Word Count Estimation: 25,252
Date of Issue: 2008-10-07
Date of Implementation: 2009-04-01
Older Standard (superseded by this standard): GB/T 15838-1995
Quoted Standard: GB/T 7611-2001
Adopted Standard: ITU-T G.810, NEQ; ITU-T G.812, NEQ; ITU-T G.823, NEQ
Regulation (derived from): Announcement of Newly Approved National Standards No. 17 of 2008 (No. 130 overall)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the digital telephone switching equipment clock frequency accuracy, pulling range, jitter/wander generation, jitter/wander input tolerance, jitter/wander transfer characteristics, retention characteristics, phase transients/phase discontinuities and other properties of the test methods, and monitoring, alarm detection and control functions. This standard applies to digital telephone switching equipment clock.

GB/T 15838-2008: Test methods for the performances of switching equipment clocks in digital network

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test methods for the performances of switching equipment clocks in digital network ICS 33.040.30 M15 National Standards of People's Republic of China Replacing GB/T 15838-1995 Digital network switching equipment clock performance Test Methods Posted 2008-10-07 2009-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 Abbreviations 1 4 frequency accuracy 1 5 pull-in/pull out of the range of 2 6 drift 4 7 jitter generation 5 8 jitter/wander tolerance input 6 9 jitter/wander transfer characteristics 8 10 maintain performance 10 11 phase transient/phase discontinuity 12 12 monitoring, alarm and control functions to detect 13 The main performance Appendix A (normative) requirements for use of the instrument 16 Annex B (informative) Test parameter definition 18

Foreword

The standard reference ITU-TG. 810 "definitions and terminology for synchronization networks", G. 812 "is suitable for clock synchronization network nodes from the timing requirements" and G. 823 "inside to 2048kbit/s hierarchical level based digital network jitter and wander control", and GB/T 15838-1995 conduct Amendments. This standard replaces GB/T 15838-1995 "Test Method equipment clock performance digital synchronous network." This standard GB/T 15838-1995 The main amendments are as follows. a) the standard name was changed to "Test Method digital network switching equipment clock performance"; b) reference to ITU-T Recommendation G. 812 and G. 823, and YD/T 1011-1999, for all test items proposed a complete The new test method, and as a benchmarking methodology; c) the original standard test methods as an alternative test method preserves; d) original standard Chapter 1, "the main content and scope" was changed to Chapter 1, "scope"; e) the original standard in Chapter 2, "reference standard" was changed to Chapter 2, "Normative references"; f) increased Chapter 3, "Acronyms"; g) According YDN065-1997, increase the Chapter 4, "frequency accuracy"; h) the original standard in Appendix A "main performance requirements of this standard test configuration for each use of the instrument (Supplement)" was changed to Appendix A (Regulation Normative appendix) "The main use of the instrument's performance requirements," and according to the new test method proposed Appendix A accordingly supplement; i) according to ITU-T Recommendation G. 810, an increase of Annex B (informative) "parameter defines the test." The standard proposed by the Ministry of Industry and Information Technology of the People's Republic of China. The standard by the China Communications Standards Association is responsible for centralized. This standard is mainly drafted by. Ministry of Information Industry Telecommunications Research Institute. The main drafters of this standard. Wang Jianhua, Xu Yijun, Hu Changjun. This standard was first released in 1995, this is the first revision. Digital network switching equipment clock performance Test Methods

1 Scope

This standard specifies the frequency accuracy of the digital telephone switching equipment clock pulling range, jitter/wander generation, jitter/wander tolerance input Limit, the jitter/wander transfer characteristics, the test methods to keep properties, phase transient/phase discontinuity and other properties, as well as monitoring, alarm and control Detection functions. This standard applies to digital telephone switching equipment clocks.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 7611-2001 bit rate for digital network electrical interface characteristics

3 Abbreviations

The following abbreviations apply to this standard. MTIE MaximumTimeIntervalError maximum time interval error STM-N SynchronousTransportModule, LevelN N order Synchronous Transport Module TDEV TimeDeviation time deviation Unit interval UI UnitInterval

4 frequency accuracy

4.1 index requirements For two transit switching equipment clocks whose frequency accuracy should be better than ± 4.0E-7. For three local switching equipment clocks whose frequency accuracy should be better than ± 4.6E-6. 4.2 Test Schematic Frequency accuracy test schematic shown in Figure 1. Figure 1 Schematic frequency accuracy test 4.3 Test methods and results 1) Figure 2 is connected, the measured switching device cycled and the clock is free-running state, start the measurement. ......

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