1、 7 International Telecommunication Union ITU-T G.783TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(05/2008) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Principal characteristics of multiplexing equipment for the synchronous digital
2、hierarchy Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 1 Recommendation ITU-T G.783 (2006) Amendment 1 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.1
3、99 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.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 INTERC
4、ONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 General G.700G.709 Coding of analogue signals G.710G.729 Principal characteristics of primary
5、 multiplex equipment G.730G.739 Principal characteristics of second order multiplex equipment G.740G.749 Principal characteristics of higher order multiplex equipment G.750G.759 Principal characteristics of transcoder and digital multiplication equipment G.760G.769 Operations, administration and mai
6、ntenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789 Other terminal equipment G.790G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 QUALITY OF SERVICE AND PERFO
7、RMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. IT
8、U-T G.783 (2006)/Amd.1 (05/2008) i Recommendation ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 1 Summary Amendment 1 to Recommendation ITU-T G.783 contains the STM-256 rate jitter parameters and specifications as well as the detection and p
9、rocessing of the generic alarm indication signal (AIS) as inserted by the optical transport network (OTN). Source Amendment 1 to Recommendation ITU-T G.783 (2006) was approved on 22 May 2008 by ITU-T Study Group 15 (2005-2008) under Recommendation ITU-T A.8 procedure. ii Rec. ITU-T G.783 (2006)/Amd.
10、1 (05/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsi
11、ble for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-
12、T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is 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
13、basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandat
14、ory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved 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 u
15、se of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL 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 n
16、o position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, pro
17、tected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2009 All rights reserved. No part
18、 of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.783 (2006)/Amd.1 (05/2008) iii CONTENTS Page 1 Scope 1 2 Changes to G.783 1 2.1 References 1 2.2 Modifications to clause 6.2.6.1, AIS defect (dAIS) . 1 2.3 Modifications to clau
19、se 9.3.1.1, STM-N optical section to regenerator section adaptation source OSn/RSn_A_So 1 2.4 Modifications to clause 9.3.1.2, STM-N optical section to regenerator section adaptation sink OSn/RSn_A_Sk 3 2.5 Add a new clause 9.3.1.3, STM-N optical section to regenerator section adaptation sink OSn/RS
20、n_A_Sk Type 2 3 2.6 Changes to clause 15.1.3, Jitter and wander transfer . 6 Rec. ITU-T G.783 (2006)/Amd.1 (05/2008) 1 Recommendation ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 1 1 Scope This amendment contains material to be added to Rec
21、ommendation ITU-T G.783 in respect to new STM-256, jitter parameters and generic AIS detection. 2 Changes to G.783 The following clauses contain changes to be made to G.783. 2.1 References Add the following reference to clause 2: 27 Recommendation ITU-T G.8251 (2001), The control of jitter and wande
22、r within the optical transport network (OTN). 2.2 Modifications to clause 6.2.6.1, AIS defect (dAIS) In clause 6.2.6.1, add the STM-AIS defect as follows: 6.2.6.1 AIS defect (dAIS) MS-n dAIS: See 6.2.6.2/G.806. AU-n dAIS: See Annex A. TU-m dAIS: See Annex A. STM-AIS: See 6.2.6.2.1/G.806. 2.3 Modific
23、ations to clause 9.3.1.1, STM-N optical section to regenerator section adaptation source OSn/RSn_A_So In clause 9.3.1.1, add the following note after the text: “This function limits the output jitter on the clock information in the OSn_AI_Data signal as given in Tables 9-6 and 9-7 measured over a 60
24、-second interval“: NOTE For STM-256 interfaces operating with unregenerated links between SDH nodes synchronized by synchronization sources of G.813 quality or better, higher limits may apply for jitter generation. In such cases, the values, as specified in Table A.3/G.8251, are required for wideban
25、d jitter, measured from 80 kHz to 320 MHz. 2 Rec. ITU-T G.783 (2006)/Amd.1 (05/2008) Modify tables: Table 9-6 Jitter generation for STM-N type A regenerators in 2048 kbit/s based networks Measurement band (3 dB frequencies) (Notes 1 and 2) Interface high-pass (kHz) low-pass (MHz) 60 dB/dec Peak-peak
26、 amplitude (UI) (Notes 2 and 3) 0.5 1.3 0.30 STM-1 optical 65 1.3 0.10 1 5 0.30 STM-4 optical 250 5 0.10 5 20 0.30 STM-16 optical 1000 20 0.10 20 80 0.30 STM-64 optical 4000 80 0.10 FFS80 FFS320 FFS0.3 STM-256 optical Note 4 16 000 320 0.140 NOTE 1 The high-pass and low-pass measurement filter trans
27、fer functions are defined in clause 5/G.825. NOTE 2 For STM-1: 1 UI = 6.43 ns For STM-4: 1 UI = 1.61 ns For STM-16: 1 UI = 0.40 ns For STM-64: 1 UI = 0.10 ns For STM-256: 1 UI = 0.025 ns NOTE 3 The measurement time and pass/fail criteria are defined in clause 5/G.825. NOTE 4 Values for STM-256 are p
28、rovisional and are not present in ITU-T Rec. G.825 at the time of publication of this version of this Recommendation. Rec. ITU-T G.783 (2006)/Amd.1 (05/2008) 3 Table 9-7 Jitter generation for STM-N regenerators in 1544 kbit/s based networks Measurement band (3 dB frequencies) Interface high-pass (kH
29、z) low-pass (MHz) 60 dB/dec Limit (Notes 1, 2, and 3) STM-1 optical 12 1.3 0.1 UIpp/0.01 UIrms STM-4 optical 12 5 0.1 UIpp/0.01 UIrms STM-16 optical 12 20 0.1 UIpp/0.01 UIrms 20 80 0.30 UIpp STM-64 optical 4000 80 0.10 UIpp80 320 0.3 UIpp STM-256 optical 16000FFS 320FFS 0.14 UIppFFS NOTE 1 Both peak
30、-to-peak and rms jitter limits are to be met simultaneously for the rates STM-1, STM-4, and STM-16 (not applicable for STM-64). NOTE 2 For STM-1: 1 UI = 6.43 ns For STM-4: 1 UI = 1.61 ns For STM-16: 1 UI = 0.40 ns For STM-64: 1 UI = 0.10 ns For STM-256: 1 UI = 0.025 ns NOTE 3 The measurement time an
31、d pass/fail criteria are defined in clause 5/G.825. 2.4 Modifications to clause 9.3.1.2, STM-N optical section to regenerator section adaptation sink OSn/RSn_A_Sk Change the title of clause 9.3.1.2 and add a new note as follows: 9.3.1.2 STM-N optical section to regenerator section adaptation sink OS
32、n/RSn_A_Sk Version 1 NOTE 1 Equipment designed prior to this amendment may not support the detection of generic AIS. Instead, such equipment will detect and report LOF. 2.5 Add a new clause 9.3.1.3, STM-N optical section to regenerator section adaptation sink OSn/RSn_A_Sk Type 2 Add a new clause des
33、cribing equipment capable of detecting generic (STM) AIS as follows: 9.3.1.3 STM-N optical section to regenerator section adaptation sink OSn/RSn_A_Sk version 2 This equipment supports the detection of generic (STM) AIS. This difference concerns only the generic AIS as a potential output signal from
34、 OTN as specified in ITU-T Rec. G.798. There will not be any interworking issues between equipment version 1 not supporting this and version 2 supporting the detection of this AIS signal. 4 Rec. ITU-T G.783 (2006)/Amd.1 (05/2008) Symbol Figure 9a OSn/RSn_A_Sk symbol Interfaces Table 9a OSn/RSn_A_Sk
35、input and output signals Inputs Outputs OSn_AI_Data OSn_AI_TSF RSn_CI_Data RSn_CI_Clock RSn_CI_FS RSn_CI_SSF OSn/RSn_A_Sk_MI_cLOF OSn/RSn_A_Sk_MI_pOFS Processes The OSn_AI_Data signal, with its contained timing, is received by the OSn_AP from the OSn_TT_Sk function. The OSn/RSn function processes th
36、is signal to form data and associated timing at the RSn_CP. The function also recovers frame alignment and identifies the frame start positions in the data of the RSn_CP. The framed STM-N data and timing are presented at the RSn_CP. Regeneration: The function shall operate with a maximum BER of TBD
37、when any combination of the following signal conditions exist at the input: any input optical power level within the range specified in ITU-T Recs G.957 or G.691; jitter modulation applied to the input signal as specified in ITU-T Rec. G.825; the input signal bit rate has any value in the range N 15
38、5 520 kbit/s 20 ppm. NOTE 1 The frequency and jitter/wander tolerance might be further constrained by the requirements of the client layers. To ensure adequate immunity against the presence of consecutive identical digits (CIDs) in the STM-N signal, the function shall comply with the specification i
39、n 15.1.4. The function shall process the signal such that in the absence of input jitter, the intrinsic jitter at the STM-N output interface (in a regenerative repeater) shall not exceed the values specified in 15.1.2. The function shall process the signal such that the jitter transfer (measured bet
40、ween an STM-N input and STM-N output in a regenerative repeater) shall be as specified in 15.1.3. The frame alignment process is described in 8.2.1. Rec. ITU-T G.783 (2006)/Amd.1 (05/2008) 5 Defects dLOF: see 6.2.5.1. dAIS: see 6.2.6.2.1/G.806. NOTE 2 Equipment designed prior to this amendment will
41、not support the detection of AIS. Instead, such equipment will detect and report LOF. Defect correlations cPLM dPLM and (not AI_TSF) cLOF dLOF and (not dAIS) and (not dPLM) and (not AI_TSF) Consequent actions The function shall perform the following consequent actions: aAIS dLOF or AI_TSF or dAIS aS
42、SF dLOF or AI_TSF or dAIS On declaration of an aAIS, the function shall output an all-ONEs (AIS) signal complying to the frequency limits for this interface within 250 s; on clearing of aAIS, the function shall output normal data within 250 s. Defect correlations The function shall perform the follo
43、wing defect correlations to determine the most probable fault cause. This fault cause shall be reported to the SEMF. cLOF dLOF and (not AI_TSF) and (not dAIS) NOTE 3 dAIS is not reported as a fault cause as it is a secondary alarm and will result in aSSF, which is reported as cSSF fault cause in the
44、 RSn_TT_Sk that directly follows this function. Performance monitoring The function shall perform the following performance monitoring primitives processing: Any second with at least one OOF event shall be reported as a pOFS (optional in ITU-T Rec. G.784 10). 6 Rec. ITU-T G.783 (2006)/Amd.1 (05/2008
45、) 2.6 Changes to clause 15.1.3, Jitter and wander transfer Add the required values for STM-256 jitter tolerance and transfer to Tables 15-1 and 15-2 as follows: Table 15-1 Parameter values for Figure 15-2 STM level A3(UI) A4(UI) f2(kHz) f3(kHz) Reference STM-1 Optical 1.5 0.15 6.5 65 Table 3/G.825 F
46、igure 1/G.825 STM-1 Electrical (Note 1) 1.5 0.075 3.3 65 Table 4/G.825 Figure 2/G.825 STM-1 Electrical (Note 2) 1.5 0.15 6.5 65 Table 4/G.825 Figure 1/G.825 STM-4 1.5 0.15 25 250 Table 5/G.825 Figure 3/G.825 STM-16 1.5 0.15 100 1000 Table 6/G.825 Figure 4/G.825 STM-64 1.5 0.15 400 4000 Table 7/G.825
47、 Figure 5/G.825 STM-256 Tbd1.5 0.18 tbd Tbd1920 Tbd16000 Table 8/G.825 Figure 6/G.825tbd NOTE 1 These values apply to SDH networks optimized for the 2048 kbit/s hierarchy. NOTE 2 These values apply to SDH networks optimized for the 1544 kbit/s hierarchy. Table 15-2 Jitter transfer parameters STM-N l
48、evel (type) L(kHz) C(kHz) H(kHz) P (dB) STM-1 (A) 1.3 130 1 300 0.1 STM-1 (B) 0.3 30 1 300 0.1 STM-4 (A) 5 500 5 000 0.1 STM-4 (B) 0.3 30 3 000 0.1 STM-16 (A) 20 2 000 20 000 0.1 STM-16 (B) 0.3 30 3 000 0.1 STM-64 (A) 10 1 000 80 000 0.1 STM-64 (B) tbd tbd tbd tbd STM-256 (A) tbd40 tbd4 000 tbd320 0
49、00 tbd0.1 STM-256 (B) tbd tbd tbd tbd Printed in Switzerland Geneva, 2009 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series 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 Integrated services digital network Se
