With the rapid development of the power communications network， the digital synchronization network has become an important part in it and is the key to ensure the performance and quality of network synchronization. With the introduction of various new services and the rapid development of SDH transport network in electric power communications， a quicker development of digital synchronization network has become an urgent need. Therefore， it is imperative and necessary to develop a specification for engineering design of digital synchronization network， which may suit the electric power communications network and meet the future requirements for some time. In the development of these specifications， the design experiences in the past decade are summarized. Through extensively referring to the engineering， operation practices and study results， while seeking comments from engineering， operation and management entities concemed， the drafiing panel endeavors to work out these specifications that can reflect the relevant requirements in respect of engineering， construction， and operation management.
Foreword I Scope 2 Normative References 3 Abbreviations 4 Genera 5 Concept of Synchronization Network 6 Reference Distribution Network Desig 7 Synchronization Distribution Based on SDH Transport Network 8 Design of Synchronization Network Management System 9 Synchronization of Various Communication Equipment 10 Equipment and Instrument Configuration 11 Installation Design of Synchronous Equipment Appendix A (Normative) Explanation of Wording in the Specification Appendix B (Informative) Calculation of the Wander of Extremely Long Timing Reference Link Appendix C (Informative) Basic Principles and Requirements for Retiming of PDH 2048 kbit/s Tributary Appendix D (Normative) Network Limits for Synchronization Network Interfaces Appendix E (Normative) Synchronization Status Message
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