ANSI ATIS 0900101-2013 Synchronization Interface Standard.pdf
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1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0900101.2013 SYNCHRONIZATION INTERFACE STANDARD As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing business priorities. Through ATIS committee
2、s and forums, nearly 200 companies address cloud services, device solutions, emergency services, M2M communications, cyber security, ehealth, network evolution, quality of service, billing support, operations, and more. These priorities follow a fast-track development lifecycle from design and innov
3、ation through solutions that include standards, specifications, requirements, business use cases, software toolkits, and interoperability testing. ATIS is accredited by the American National Standards Institute (ANSI). ATIS is the North American Organizational Partner for the 3rd Generation Partners
4、hip Project (3GPP), a founding Partner of oneM2M, a member and major U.S. contributor to the International Telecommunication Union (ITU) Radio and Telecommunications sectors, and a member of the Inter-American Telecommunication Commission (CITEL). For more information, visit . AMERICAN NATIONAL STAN
5、DARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreeme
6、nt has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made towards their resolution. The use of Ame
7、rican National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Stand
8、ards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute.
9、 Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that act
10、ion be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice of Disclaimer holdover characteristics for stratum 2, 3, and 3E
11、 clocks; and second-generation Synchronization Status Message quality levels. ATIS-0900101.2013 ii Foreword The information contained in this Foreword is not part of this American National Standard (ANS) and has not been processed in accordance with ANSIs requirements for an ANS. As such, this Forew
12、ord may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the Standard. As a leading technology and solutions development organization, the Alliance for Telecommunications Industry Solution
13、s (ATIS) brings together the top global information and communications technology (ICT) companies to advance the industrys most-pressing business priorities. ATIS serves the public through improved understanding between carriers, customers, and manufacturers. The Copper/Optical Access, Synchronizati
14、on, and Transport (COAST) Committee - formerly the Optical Transport and Synchronization Committee (OPTXS) - engages industry expertise to develop and recommend standards and technical reports for home, access and transport network and synchronization technologies over copper and optical mediums. CO
15、AST is committed to proactive engagement with national, regional and international standards development organizations and forums that share its scope of work. The technical requirements, measurement techniques, metrics, and operational practices documented in COASTs work products encompass copper a
16、nd optical network interfaces and transceiver functionality required for access to, and transport through, telecommunications networks. ANSI guidelines specify two categories of requirements: mandatory and recommendation. The mandatory requirements are designated by the word shall and recommendation
17、s by the word should. Where both a mandatory requirement and a recommendation are specified for the same criterion, the recommendation represents a goal currently identifiable as having distinct compatibility or performance advantages. Suggestions for improvement of this document are welcome. They s
18、hould be sent to the Alliance for Telecommunications Industry Solutions, COAST,1200 G Street NW, Suite 500, Washington, DC 20005. At the time it approved this document, COAST, which is responsible for the development of this Standard, had the following members: K. Biholar, Alcatel-Lucent, COAST Chai
19、r B. Szeto, Xtera, COAST Vice-Chair L. Cosart, Microsemi COAST SYNC Chair and Technical Editor D. Overdorf, AT in clock the offrequency the f frequency. ideal the if 3.1.3 clock fast mode: An operating condition of a clock in which it is locked to an external reference and is using time constants th
20、at are reduced to quickly bring the local oscillators frequency into approximate agreement with the synchronization reference frequency. 3.1.4 clock free-run mode: An operating condition of a clock whose output signals are internally controlled. The clock has never had, or has lost, external referen
21、ce input and has no access to stored data that was acquired from a previously connected external reference. Free-run begins when the clock output no longer reflects the influence of a connected, external reference, or the transition from it. Free-run ends when the clock output is influenced by an ex
22、ternal reference or the process to achieve lock to an external reference. Free-run may provide needed stability when external reference has been lost and stored holdover data has been contaminated or deemed disruptive. 8This document is available from the Alliance for Telecommunications Industry Sol
23、utions. 9This document is available from the Alliance for Telecommunications Industry Solutions. 10This document is available from the International Telecommunication Union (ITU), Place des Nations, 1211 Geneva 20, Switzerland. 11Traditionally, a building contains a single service provider. ATIS-090
24、0101.2013 3 3.1.5 clock holdover mode: An operating condition of a clock that has lost its controlling input and is using stored data, acquired while in normal operation, to control its output. The stored data is averaged to minimize the effects of short-term variations, allowing the normal conditio
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