SIST EN 60679-1:2002/A2:2004

SLOVENSKI SIST EN 60679-1:2002/A2:2004

STANDARD
julij 2004
Quartz crystal controlled oscillators of assessed quality - Part 1: Generic
specification - Amendment A2 (IEC 60679-1:1997/A2:2003)
ICS 31.140 Referenčna številka
SIST EN 60679-1:2002/A2:2004(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

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EUROPEAN STANDARD EN 60679-1/A2
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2003

ICS 31.140


English version


Quartz crystal controlled oscillators of assessed quality
Part 1: Generic specification
(IEC 60679-1:1997/A2:2003)


Oscillateurs pilotés par quartz  Quarzoszillatoren mit bewerteter Qualität
sous assurance de la qualité Teil 1: Fachgrundspezifikation
Partie 1: Spécification générique (IEC 60679-1:1997/A2:2003)
(CEI 60679-1:1997/A2:2003)






This amendment A2 modifies the European Standard EN 60679-1:1998; it was approved by CENELEC
on 2003-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this amendment the status of a national standard without any
alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60679-1:1998/A2:2003 E

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EN 60679-1:1998/A2:2003 - 2 -
Foreword
The text of document 49/591/FDIS, future amendment 2 to IEC 60679-1:1997, prepared by
IEC TC 49, Piezoelectric and dielectric devices for frequency control and selection, was submitted to
the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to
EN 60679-1:1998 on 2003-09-01.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-06-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2006-09-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of amendment 2:2003 to the International Standard IEC 60679-1:1997 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________

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- 3 - EN 60679-1:1998/A2:2003
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
Publication Year Title EN/HD Year
Add:
1)
ITU-T - The control of jitter and wander within - -
Recommendation digital networks which are based on the
G.825 synchronous digital hierarchy (SDH)

1)
ITU-T - Jitter and wander measuring equipment - -
Recommendation for digital systems which are based on
O.172 the synchronous digital hierarchy (SDH)

1)
ANSI T1.105.03 - Synchronous Optical Network (SONET) - - -
Jitter at network Interfaces

ETSI EN 300 462 Series Transmission and Multiplexing (TM); - -
Generic requirements for synchronization
networks

1)
Telcordia GR-253 - Synchronous Optical Network (SONET) - -
Transport Systems: Common Generic
Criteria





1)
Undated reference.

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NORME CEI
INTERNATIONALE IEC
60679-1
INTERNATIONAL
1997
STANDARD
AMENDEMENT 2
AMENDMENT 2
2003-05
Amendement 2
Oscillateurs pilotés par quartz
sous assurance de la qualité –
Partie 1:
Spécification générique
Amendment 2
Quartz crystal controlled oscillators
of assessed quality –
Part 1:
Generic specification
© IEC 2003 Droits de reproduction réservés ⎯ Copyright - all rights reserved
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
J
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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60679-1 Amend. 2 © IEC:2003 – 3 –
FOREWORD
This amendment has been prepared by IEC technical committee 49: Piezoelectric and
dielectric devices for frequency control and selection.
The text of this amendment is based on the following documents:
FDIS Report on voting
49/591/FDIS 49/605/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until 2005. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
_____________
Page 13
1.2 Normative references
Insert, on page 15, the following new standards:
ITU-T G.825, The control of jitter and wander within digital networks which are based on the
synchronous digital hierarchy (SDH)
ITU-T O.172, Jitter and wander measuring equipment for digital systems which are based on
the synchronous digital hierarchy (SDH)
ANSI T1.105.03, Synchronous Optical Network (SONET) – Jitter at Network Interfaces
ETSI EN 300462, Transmission and Multiplexing™; Generic requirements for synchronization
networks
Telcordia GR-253, Synchronous Optical Network (SONET) Transport Systems: Common
Generic Criteria
Page 17
2 Terminology and general requirements
2.2 Definitions
Add, on page 33, after definition 2.2.38, the following new definition:

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60679-1 Amend. 2 © IEC:2003 – 5 –
2.2.39 phase jitter
Phase jitter is the short-term variation of the zero crossings of the oscillator output signal from
their ideal position in time. Phase jitter is defined as phase variation ∆ϕ with frequency
components greater than or equal to 10 Hz. Variations slower than 10 Hz are called “wander”.
Excessive jitter can increase the bit error rate (BER) of a communication signal by incorrectly
transmitting a data-stream and can cause synchronisation problems.
The corresponding variation of the period length
∆T = ∆ϕ /(2πf )
c
is called “period jitter” (f is the clock frequency).
c
T
ref.
Trigger-
point
Peak-to-peak
jitter
IEC  1455/03
Key
T is the period of an ideal reference signal.
ref.
Figure 49 – Clock signal with phase jitter
The jitter amplitude is usually referred to the Unit Interval (UI) of one data bit-width
(e.g. UI = 6,43 ns for 155,52 Mbit/s for STM-1/OC-3) or defined as absolute time variation
(in nanoseconds, picoseconds or femtoseconds). It is quantified either as the peak-to-peak
value, or as the r.m.s. value thereof.
Jitter amplitude
NRZ-Signal
peak-to-peak
peak   peak peak
− +
+peak
Time
UI
−peak
Observation time
Clock
Period
IEC  1456/03
Figure 50 – Phase jitter measures

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60679-1 Amend. 2 © IEC:2003 – 7 –
For random type jitter the r.m.s. value is defined as the standard deviation σ (sigma) of the
underlying Gaussian distribution. The peak-to-peak jitter is then the range covered by 7σ
–6
(i.e. ±3,5 σ), according to a confidence level of 99,95348 % (i.e. 465 × 10 tail).
0,4
0,3
0,2
0,1
1 2 3 4
−4 −3 −2 −1
µ−σ µ+σ
µ
IEC  1457/03
Figure 51 – Gaussian distribution of jitter
Ideal NRZ-signal
Jitter amplitude
IEC  1458/03
Figure 52 – Jitter amplitude and period of jitter frequency
In the case of subharmonics involved in the signal generation, phase jitter may contain non-
random spectral components due to periodical change of the duty cycle. This causes a non-
Gaussian distribution, i.e. the
...