SIST EN 300 462-6-1 V1.1.1:2003

• Abstract:

  Stadardises SDH timing distribution architectures, synchronisation network level jitter and wander requirements, slave clock timing specifications and primary reference clock specifications.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.20 - Transmission systems
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 462-6-1 V1.1.1 (1998-05) - Transmission and Multiplexing (TM); Generic requirements for synchronization networks; Part 6-1: Timing characteristics of primary reference clocks

SIST EN 300 462-6-1 V1.1.1:2003 is the Slovenian adoption of ETSI EN 300 462-6-1 V1.1.1, published by the European Telecommunications Standards Institute (ETSI). It specifies timing characteristics for Primary Reference Clocks (PRCs) used to provide synchronization supply to digital networks, including limits for long-term frequency accuracy, wander, jitter, phase discontinuity, and output interfaces. Network designers, equipment makers, and test labs use it to specify, build, and verify PRC performance.

What does SIST EN 300 462-6-1 V1.1.1:2003 specify?

SIST EN 300 462-6-1 V1.1.1:2003 sets out requirements for PRCs that support synchronization in digital networks. The document applies under the environmental classes defined in ETS 300 019 unless the equipment supplier states otherwise.

The standard is organized into clauses on scope, references, definitions, frequency accuracy, noise generation, phase discontinuity, degradation of PRC performance, and interfaces. It also includes a bibliography and document history. In practice, that structure helps a reader move from general applicability to the specific testable output characteristics of the clock.

What are the key requirements of SIST EN 300 462-6-1 V1.1.1:2003?

SIST EN 300 462-6-1 V1.1.1:2003 focuses on the output behavior of a PRC, not on general network theory. The main practical checks are long-term accuracy, wander, jitter, phase breaks, and what happens if redundancy is used.

• Frequency accuracy - Clause 4 sets the long-term fractional frequency offset at 1 part in 10^11 or better for observation times longer than one week. For users, this means the PRC must stay very close to UTC over long periods.
• Noise generation - Clause 5 treats PRC output phase noise as a performance item and uses Maximum Time Interval Error (MTIE) and Time Deviation (TDEV) to characterize it. Labs need the measurement setup defined in EN 300 462-3-1 to compare results consistently.
• Wander limits - Clause 5.1 gives MTIE and TDEV limits measured with the independent clock configuration from EN 300 462-1-1. This matters because wander is what can slowly disturb downstream synchronization even when the clock still looks stable in the short term.
• Jitter limits - Clause 5.2 gives an intrinsic jitter limit for 2 048 kHz and 2 048 kbit/s outputs, measured over 60 seconds with the stated band-pass filter. That tells equipment makers exactly which interfaces need controlled short-term timing noise.
• Phase discontinuity - Clause 6 limits any output phase discontinuity at 2 048 kbit/s or 2 048 kHz to 1/8 Unit Interval (UI). In practice, internal switching or replication must not create a visible timing step at the output.
• Redundancy behavior - Clause 7 says a frequency departure in a redundant PRC should trigger switching to an undegraded oscillator before the MTIE or TDEV limits are exceeded. This is the operational rule for keeping service in spec during faults.
• Interfaces - Clause 8 ties the requirements to external interfaces, especially 2 048 kHz and 2 048 kbit/s interfaces according to ITU-T Recommendation G.703. For users, this means compliance is checked where the signal leaves the equipment.

What terms does SIST EN 300 462-6-1 V1.1.1:2003 define?

• Primary Reference Clock (PRC) - The clock that supplies the reference timing signal for other clocks in a network or network section.
• Maximum Time Interval Error (MTIE) - A measure used here to describe wander over an observation period.
• Time Deviation (TDEV) - A measure used here to characterize timing noise performance over time.
• Unit Interval (UI) - One cycle of the clock signal, or the reciprocal of the bitrate for a digital interface signal.
• Network Element (NE) - The equipment context in which the PRC may be embedded.
• Universal Co-ordinated Time (UTC) - The time reference used to verify long-term accuracy.

Who uses SIST EN 300 462-6-1 V1.1.1:2003?

SIST EN 300 462-6-1 V1.1.1:2003 is used by synchronization and transmission engineers, telecommunications equipment manufacturers, test laboratories, and network operators. They use it to design PRCs, define acceptance tests, check output interfaces, and confirm that network timing stays within the stated limits. Quality managers and buyers use it when they need a precise technical basis for specifying or evaluating synchronization equipment.

What changed in SIST EN 300 462-6-1 V1.1.1:2003 from the previous edition?

The foreword states that this EN version was republished from the earlier ETS version without technical change for this part. The history shows the path from public enquiry and vote as ETS 300 462-6 to publication as V1.1.1.

Which standards are used with SIST EN 300 462-6-1 V1.1.1:2003?

• ETS 300 019 - defines the environmental classes that apply unless stated otherwise.
• EN 300 462-1-1 - provides the definitions and terminology, and the independent clock configuration used for MTIE and TDEV measurements.
• EN 300 462-2-1 - gives the synchronization network architecture context.
• EN 300 462-3-1 - gives the MTIE/TDEV measurement details, including the anti-aliasing filter, sampling time, and measurement interval.
• EN 300 462-4-1 - relates to slave clocks for synchronization supply to SDH and PDH equipment.
• EN 300 462-5-1 - relates to slave clocks suitable for SDH equipment.
• ITU-T Recommendation G.703 - defines the physical and electrical characteristics of the 2 048 kHz and 2 048 kbit/s interfaces.

What does the SIST EN 300 462-6-1 V1.1.1:2003 document contain?

The document contains the PRC timing requirements in clause form, with MTIE and TDEV limit curves shown in figures for wander performance. It also includes the interface-specific jitter requirement, the phase discontinuity limit, and the redundancy-switching guidance for degraded clocks.

It refers readers to the related measurement and interface standards needed to apply the requirements in practice. The bibliography and history provide supporting context for the standard’s place in the synchronization-network family.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Transmission and Multiplexing (TM); Generic requirements for synchronization networks; Part 6-1: Timing characteristics of primary reference clocks33.040.20Prenosni sistemTransmission systemsICS:Ta slovenski standard je istoveten z:EN 300 462-6-1 Version 1.1.1SIST EN 300 462-6-1 V1.1.1:2003en01-december-2003SIST EN 300 462-6-1 V1.1.1:2003SLOVENSKI
STANDARD
EN 300 462-6-1 V1.1.1 (1998-05)European Standard (Telecommunications series)Transmission and Multiplexing (TM);Generic requirements for synchronization networks;Part 6-1: Timing characteristics of primary reference clocksSIST EN 300 462-6-1 V1.1.1:2003

ETSIEN 300 462-6-1 V1.1.1 (1998-05)2ReferenceDE/TM-03017-6-1 (4a1i9ico.PDF)KeywordsSynchronization, transmission, SDHETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: [phone]
Fax: [phone]Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/[e-mail]://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo part may be reproduced except as authorized by written permission.The copyright and the foregoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1998.All rights reserved.SIST EN 300 462-6-1 V1.1.1:2003

ETSIEN 300 462-6-1 V1.1.1 (1998-05)3ContentsIntellectual Property Rights.4Foreword.41Scope.62References.63Definitions and abbreviations.74Frequency accuracy.75Noise generation.75.1Wander.75.2Jitter.86Phase discontinuity.87Degradation of the performance of a PRC.98Interfaces.9Bibliography.10History.11SIST EN 300 462-6-1 V1.1.1:2003

ETSIEN 300 462-6-1 V1.1.1 (1998-05)4Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin ETR 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect ofETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the ETSIWeb server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).Pursuant to the ETSI Interim IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. Noguarantee can be given as to the existence of other IPRs not referenced in ETR 314 (or the updates on the ETSI Webserver) which are, or may be, or may become, essential to the present document.ForewordThis European Standard (Telecommunications series) has been produced by the Transmission and Multiplexing (TM)Technical Committee.The present document has been produced to provide requirements for synchronization networks that are compatible withthe performance requirements of digital networks. It is one of a family of documents covering various aspects ofsynchronization networks:Part 1-1:"Definitions and terminology for synchronization networks";Part 2-1:"Synchronization network architecture";Part 3-1:"The control of jitter and wander within synchronization networks";Part 4-1:"Timing characteristics of slave clocks suitable for synchronization supply to Synchronous DigitalHierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) equipment";Part 4-2:"Timing characteristics of slave clocks suitable for synchronization supply to Synchronous DigitalHierarchy (SDH) and Plesiochronous Digital Hierarchy (PDH) equipment ImplementationConformance (ICS) Statement";Part 5-1:"Timing characteristics of slave clocks suitable for operation in Synchronous Digital Hierarchy(SDH) equipment";Part 6-1:"Timing characteristics of primary reference clocks";Part 6-2:"Timing characteristics of primary reference clocks Implementation Conformance (ICS)Statement";Part 7-1:"Timing characteristics of slave clocks suitable for synchronization supply to equipment in localnode applications".Parts 1-1, 2-1, 3-1 and 5-1 have previously been published as ETS 300 462 Parts 1, 2, 3 and 5, respectively.Additionally, parts 4-1 and 6-1 completed the Voting phase of the Two Step Approval procedure as ETS 300 462 Parts4 and 6, respectively.It was decided to prepare ICS proformas for several of the parts and this necessitated a re-numbering of the individualdocument parts. It was also decided to create a new part 7-1.This in turn led to a need to re-publish new versions of all six parts of the original ETS. At the same time, theopportunity was taken to convert the document type to EN.This has involved no technical change to any of the documents. However part 5-1 has been modified, due to editorialerrors which appeared in ETS 300 462-5.SIST EN 300 462-6-1 V1.1.1:2003

ETSIEN 300 462-6-1 V1.1.1 (1998-05)5National transposition datesDate of adoption of this EN:22 May 1998Date of latest announcement of this EN (doa):31 August 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):28 February 1998Date of withdrawal of any conflicting National Standard (dow):28 February 1998SIST EN 300 462-6-1 V1.1.1:2003

ETSIEN 300 462-6-1 V1.1.1 (1998-05)61ScopeThis European Standard (Telecommunications series) outlines requirements for Primary Reference Clocks (PRCs)suitable for synchronization supply to digital networks.NOTE:The requirements in the present document apply under environmental conditions according to one of theenvironmental classes defined in ETS 300 019 [1], unless stated otherwise. The manufacturer will need tospecify to which specific environmental class an equipment belongs.A typical PRC provides the reference signal for the timing or synchronization of other clocks within a network orsection of a network. The long-term accuracy of the PRC should be maintained at
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