ISO/IEC INTERNATIONAL STANDARD 11573 First edition 1994-12-15 Information technology Telecommunications and information exchange between systems Synchronization methods and technical requirements for Private Integrated Services Networks Technologies de l'information - Télécommunications et échange d'information entre systemes -- Methodes de synchronisation et exigences techniques pour les réseaux privés avec intégration de services IEC [so Reference number ISO/IEC 11573:1994(E) Copyright Intermational Organization for Standardization 'rovided by IHS rmitted without license from IHS Not for Resale ISO/IEC11573:1994(E) Contents Page Section 1 : General 1.1 Scope 1 1.2 Definitions . . 1 1.3 Abbreviations and acronyms .. ... 3 1.4 Impact of slips 4 Section 2 : Technical requirements, Synchronization methods 2.1 Technical requirements 5 2.1.1 Jitter and wander at the input 5 2.1.1.1 CO and T0 interfaces (144 kbits/s) 5 2.1.1.2 C1 and T1 interfaces (1,544 Mbits/s) 5 2.1.1.3 C2 and T2 interfaces (2,048 Mbits/s) 9 2.1.2 Jitter and wander at the output . 6 2.1.2.1 C0 and To interfaces (144 kbits/s) 9 2.1.2.2 C1 and T1 interfaces (1,544 Mbits/s) 6 2.1.2.3 C2 and T2 interfaces (2,048 Mbits/s) 7 2.1.3 Frequency deviation at the input 7 2.1.4 Accuracy . 7 2.1.5 Lock range 7 2.1.6 Phase discontinuity of slave clocks 7 2.2 Synchronization methods for PISNs 8 2.2.1 High level concepts ......... 8 2.2.2 Reference Clock Switching Criteria 8 2.2.3 Reference Restoral 6 2.2.4 Timing Reference Interfaces and Alarms 9 2.2.5Buffers. 6 2.2.6 Controls 9 2.2.7 Slip performance objectives 6 2.2.8 Strategies ..... 10 Section 3 : Description of the synchronization methods 3.1 Plesiochronous operation 11 3.2 Synchronization from one input 11 3.3 Automatic switch over with signalling 12 3.4 Automatic switch over without signalling 12 Annexes A Choice of clock references A.1Choiceofreferencefrompublicnodes. 13 A.2Choice of references between private nodes 14 A.3 Avoidance of Timing Loops 15 B Synchronization configuration B.1 Master Slave configurations (synchronization) 16 B.2 master-master configuration (split timing) 17 ISOAEC1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher ISO/IEC Copyright Office · Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland Noreproductionornetworkingpemited without licensefromHS Not for Resale ISO/IEC11573:1994(E) 0 ISO/IEC C Basis of strategies C.1 Slip rate . . 18 C.2Allocationofthecontrolledslips 18 C.3 Unavailability of the links 19 C.4 Nodal solutions 20 C.5 Description of the five options 21 D Synchronized Private Network Examples D.1 Example with a small private network 22 D.2 Example with a big private network 22 D.3 Example with two different public clock sources 23 D.4 Example with a transit node . . . 23 E Slave Clock Performance Measurement Guidelines E.1 Slave Clocks considerations 24 E.1.1 ideal Operation . . 24 E.1.2 Stressed Operation. 25 E.1.3 Holdover Operation 25 E.2 Test Configuration Guidelines 25 E.2.1 Reference Clock 25 E.2.2 Digital Reference Simulation 26 E.2.3 Output Timing Signal Recovery 26 E.3 Test categories . 26 E.3.1 ldeal Testing 26 E.3.2 Stress Testing 26 E.3.3 Holdover Testing 27 F Signalling for management of synchronization F.1 Presentation ..... 28 F.1.1 Configuration parameters 28 F.1.2Reactionsofthenode 28 F.1.3 Reference clock switching and restoral 28 F.2 Description of the states 28 F.2.1Initialstates 28 F.2.2 Slave states ... .... 29 F.2.3 Autonomous state 29 F.2.4Waitstates. 29 F.3 Description of the events 29 F3.1 Failure of links 29 29 F.3.2Signallinginformation 29 F.3.3Timeout F.4 SDL representation of the state machine 29 G Bibliography 34 1i Provided by IHS unc Not for Resale