NENA PSAP Master Clock Standard NENA PSAP Master Clock Standard NENA-STA-026.5-2016 (originally NENA 04-002) DSC Approval: 09/13/2016 PRC Approval: 12/01/2016 NENA Executive Board Approval: 12/08/2016 ANSI Approval: 12/21/2016 Next Scheduled Review Date: 12/01/2021 Prepared by: National Emergency Number Association (NENA) Agency Systems Committee, Document Review Working Group Published by NENA Printed in USA NENA PSAP Master Clock Standard NENA-STA-026.5-2016 (originally NENA 04-002), December 21, 2016 NENA STANDARD DOCUMENT NOTICE This Standard Document (STA) is published by the National Emergency Number Association (NENA) as an information source for the designers, manufacturers, administrators and operators of systems to be utilized for the purpose of processing emergency calls. It is not intended to provide complete design or operation specifications or parameters or to assure the quality of performance for systems that process such equipment or services. NENA reserves the right to revise this Standard Document for any reason including, but not limited to: Conformity with criteria or standards promulgated by various agencies, Utilization of advances in the state of the technical arts, Or to reflect changes in the design of equipment, network interfaces or services described herein. This document is an information source for the voluntary use of communication centers. It is not intended to be a complete operational directive. It is possible that certain advances in technology or changes in governmental regulations will precede these revisions. All NENA documents are subject to change as technology or other influencing factors change. Therefore, this NENA document should not be the only source of information used. NENA recommends that readers contact their 9-1-1 System Service Provider (9-1-1 SSP) representative to ensure compatibility with the 9-1-1 network, and their legal counsel to ensure compliance with current regulations. Patents may cover the specifications, techniques, or network interface/system characteristics disclosed herein. No license expressed or implied is hereby granted. This document SHALL NOT be construed as a suggestion to any manufacturer to modify or change any of its products, nor does this document represent any commitment by NENA or any affiliate thereof to purchase any product whether or not it provides the described characteristics. This document has been prepared solely for the use of 9-1-1 System Service Providers, network interface and system vendors, participating telephone companies, 9-1-1 Authorities, etc. By using this document, the user agrees that NENA will have no liability for any consequential, incidental, special, or punitive damages arising from use of the document. NENA’s Committees have developed this document. Recommendations for change to this document may be submitted to: National Emergency Number Association 1700 Diagonal Rd, Suite 500 Alexandria, VA 22314 202.466.4911 or [email protected] © Copyright 2016 National Emergency Number Association, Inc. 12/21/2016 Page 2 of 23 NENA PSAP Master Clock Standard NENA-STA-026.5-2016 (originally NENA 04-002), December 21, 2016 ACKNOWLEDGEMENTS The National Emergency Number Association (NENA) National Emergency Number Association (NENA) Agency Systems Committee, Document Review Working Group developed this document. NENA recognizes the following industry experts and their employers for their contributions in development of this document. Executive Board Approval Date 12/08/2016 Members Employer Michael Smith, Agency Systems Committee DSS Corporation Co-Chair and Working Group Member Rick Blackwell ENP, Agency Systems Greenville County Office of E9-1-1 SC Committee Co-Chair and Working Group Member Amy McDowell ENP, Working Group Greenville County Office of E9-1-1 SC Co-Chair Mike Vislocky, Working Group Co-Chair Network Orange, Inc. and Technical Editor John Clark Masterclock Bob Finney ENP Collier County FL John Geib ENP Montgomery County PA William Hickey Spectracom Corporation Remi Rundzio Motorola Solutions Inc. Bob Tilden AT&T Lisa Wirtanen AT&T Special Acknowledgements: Delaine Arnold ENP, Committee Resource Manager, has facilitated the production of this document through the prescribed approval process. The Document Review Working Group is part of the NENA Development Group that is led by: Pete Eggimann ENP and Jim Shepard ENP, Development Steering Council Co-Chairs Roger Hixson ENP, Technical Issues Director Chris Carver ENP, PSAP Operations Director 12/21/2016 Page 3 of 23 NENA PSAP Master Clock Standard NENA-STA-026.5-2016 (originally NENA 04-002), December 21, 2016 Table of Contents 1 EXECUTIVE OVERVIEW .............................................................................................................................. 5 2 INTRODUCTION .............................................................................................................................................. 5 2.1 OPERATIONS IMPACTS SUMMARY ......................................................................................................................... 5 2.2 TECHNICAL IMPACTS SUMMARY........................................................................................................................... 5 2.3 SECURITY IMPACTS SUMMARY ............................................................................................................................. 5 2.4 DOCUMENT TERMINOLOGY .................................................................................................................................. 6 2.5 REASON FOR ISSUE/REISSUE ................................................................................................................................. 6 2.6 RECOMMENDATION FOR ADDITIONAL DEVELOPMENT WORK .............................................................................. 7 2.7 ANTICIPATED TIMELINE ........................................................................................................................................ 7 2.8 COST FACTORS ..................................................................................................................................................... 7 2.9 COST RECOVERY CONSIDERATIONS ..................................................................................................................... 7 2.10 ADDITIONAL IMPACTS (NON-COST RELATED)................................................................................................... 7 2.11 INTELLECTUAL PROPERTY RIGHTS (IPR) POLICY ............................................................................................ 7 2.12 ABBREVIATIONS, TERMS AND DEFINITIONS ..................................................................................................... 8 3 MASTER CLOCK DESCRIPTION AND FEATURE DEFINITIONS ........................................................ 9 3.1 COMMON REQUIREMENTS .................................................................................................................................... 9 3.2 RS-232 ASCII TIME CODE ................................................................................................................................. 10 3.3 IRIG SPECIFICATIONS ......................................................................................................................................... 11 3.3.1 IRIG Formats............................................................................................................................................ 12 3.3.2 Signature Control ..................................................................................................................................... 12 3.3.3 IRIG B Output........................................................................................................................................... 12 3.3.4 IRIG B General Description ..................................................................................................................... 12 3.3.5 IRIG E Output........................................................................................................................................... 16 3.3.6 IRIG E General Description ..................................................................................................................... 16 3.3.7 Control Function Field ............................................................................................................................. 16 3.4 ETHERNET NETWORK TIME PROTOCOL .............................................................................................................. 20 4 NENA REGISTRY SYSTEM (NRS) CONSIDERATIONS ........................................................................ 21 5 DOCUMENTATION REQUIRED FOR THE DEVELOPMENT OF A NENA XML SCHEMA .......... 21 6 RECOMMENDED READING AND REFERENCES .................................................................................. 21 7 PREVIOUS ACKNOWLEDGMENTS .......................................................................................................... 22 12/21/2016 Page 4 of 23 NENA PSAP Master Clock Standard NENA-STA-026.5-2016 (originally NENA 04-002), December 21, 2016 1 Executive Overview Purpose and Scope of Document This Standard is a guide for designers and manufacturers of PSAP equipment for use in an E9-1-1 environment. These specifications are not for use for NG9-1-1 time synchronization; those specifications can be found in the Timer Server section of NENA-STA-010. This Standard identifies engineering
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