1、 International Telecommunication Union ITU-T G.813TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(06/2005) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital networks Design objectives for digital networks Timing characteristics of SDH equipment slave clocks
2、 (SEC) Corrigendum 1 ITU-T Recommendation G.813 (2003) Corrigendum 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.2
3、00G.299 INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE T
4、ELEPHONY G.450G.499 TRANSMISSION MEDIA CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 General aspects G.800G.809 Design objectives for digital networks G.810G.819 Quality and availability targets G.820G.829 Network capabilities and functions G.830G.839
5、SDH network characteristics G.840G.849 Management of transport network G.850G.859 SDH radio and satellite systems integration G.860G.869 Optical transport networks G.870G.879 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.100
6、0G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 ETHERNET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. G.813 (2003)/Cor.1 (06/2005) i ITU-T R
7、ecommendation G.813 Timing characteristics of SDH equipment slave clocks (SEC) Corrigendum 1 Summary This corrigendum specifies in clause 7 the noise generation of 2048 kbit/s and 1544 kbit/s interfaces, that were listed as G.813 interfaces in clause 11. In addition, it improves the text of clause 7
8、.1 for option 1 wander in locked mode. Source Corrigendum 1 to ITU-T Recommendation G.813 (2003) was approved on 29 June 2005 by ITU-T Study Group 15 (2005-2008) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. G.813 (2003)/Cor.1 (06/2005) FOREWORD The International Telecommunication Unio
9、n (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to st
10、andardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is
11、 covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to
12、indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achi
13、eved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL
14、 PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether a
15、sserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are caution
16、ed that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. ITU 2005 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. G.813 (2003)/Cor.1
17、(06/2005) iii CONTENTS Page 1) Clause 7.1 Wander in locked mode 1 2) Clause 7.3 Jitter 1 ITU-T Rec. G.813 (2003)/Cor.1 (06/2005) 1 ITU-T Recommendation G.813 Timing characteristics of SDH equipment slave clocks (SEC) Corrigendum 1 1) Clause 7.1: Wander in locked mode Replace the following existing t
18、ext: a) Option 1 When the SEC is in the locked mode of operation, the MTIE measured using the synchronized clock configuration defined in Figure 1a/G.810 should have the limits in Table 1, if the temperature is constant (within 1K):“ With: a) Option 1 When the SEC is in the locked mode of operation
19、synchronized to a wander free reference, the MTIE measured, using the synchronized clock configuration defined in Figure 1a/G.810, should have the limits in Table 1, if the temperature is constant (within 1K): 2) Clause 7.3: Jitter a) Replace the following current text under Option 1: Output Jitter
20、at a 2048 kHz interface In the absence of input jitter, the intrinsic jitter at a 2048 kHz output interface, as measured over a 60-second interval, should not exceed 0.05 UI peak-peak when measured through a single pole band-pass filter with corner frequencies at 20 Hz and 100 kHz. With: Output Jitt
21、er at a 2048 kHz and 2048 kbit/s interface In the absence of input jitter, the intrinsic jitter at a 2048 kHz and 2048 kbit/s output interface, as measured over a 60-second interval, should not exceed 0.05 UI peak-peak when measured through a single pole band-pass filter with corner frequencies at 2
22、0 Hz and 100 kHz. b) Replace the following text under Option 2: b) Option 2 In the absence of input jitter at the synchronization interface, the intrinsic jitter at optical STM-N output interfaces shall be as stated in Table 7. With: b) Option 2 Output jitter at a 1544 kbit/s interface In the absenc
23、e of input jitter, the intrinsic jitter at a 1544 kbit/s output interface should not exceed 0.05 UI peak-peak when measured through a single pole band-pass filter with corner frequencies at 10 Hz and 40 kHz. The measurement interval is for further study. 2 ITU-T Rec. G.813 (2003)/Cor.1 (06/2005) Out
24、put jitter at an STM-N interface In the absence of input jitter at the synchronization interface, the intrinsic jitter at optical STM-N output interfaces shall be as stated in Table 7. Printed in Switzerland Geneva, 2005 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Seri
25、es D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integ
26、rated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication man
27、agement, including TMN and network maintenance Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalli
28、ng Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
