1、 International Telecommunication Union ITU-T G.783TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 4(08/2013) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Digital terminal equipments Principal characteristics of multiplexing equipment for the synchronous digital hi
2、erarchy Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 4: Text additions to add the required OSM256.4/RSn_A adaptation function for OSM256.4 interface support Recommendation ITU-T G.783 (2006) Amendment 4 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTE
3、MS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 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 CHA
4、RACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION 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.70
5、0G.799 General G.700G.709 Coding of voice and audio signals G.710G.729 Principal characteristics of primary 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 chara
6、cteristics of transcoder and digital multiplication equipment G.760G.769 Operations, administration and maintenance features of transmission equipment G.770G.779 Principal characteristics of multiplexing equipment for the synchronous digital hierarchy G.780G.789Other terminal equipment G.790G.799 DI
7、GITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE 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.8
8、000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) i Recommendation ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 4 Text additions to add the
9、 required OSM256.4/RSn_A adaptation function for OSM256.4 interface support Summary Amendment 4 to Recommendation ITU-T G.783 (2006) contains text additions to add the required OSM256.4/RSn_A adaptation function for OSM256.4 interface support. History Edition Recommendation Approval Study Group Uniq
10、ue ID11.0 ITU-T G.783 1990-12-14 XV 11.1002/1000/979-en 2.0 ITU-T G.783 1994-01-20 15 11.1002/1000/980-en 3.0 ITU-T G.783 1997-04-08 15 11.1002/1000/4022-en 4.0 ITU-T G.783 2000-10-06 15 11.1002/1000/5175-en 4.1 ITU-T G.783 (2000) Cor. 1 2001-03-15 15 11.1002/1000/5438-en 4.2 ITU-T G.783 (2000) Amd.
11、 1 2002-06-13 15 11.1002/1000/6056-en 4.3 ITU-T G.783 (2000) Cor. 2 2003-03-16 15 11.1002/1000/6266-en 5.0 ITU-T G.783 2004-02-06 15 11.1002/1000/7061-en 5.1 ITU-T G.783 (2004) Cor. 1 2004-06-13 15 11.1002/1000/7328-en 5.2 ITU-T G.783 (2004) Amd. 1 2005-07-14 15 11.1002/1000/8540-en 6.0 ITU-T G.783
12、2006-03-29 15 11.1002/1000/8759-en 6.1 ITU-T G.783 (2006) Amd. 1 2008-05-22 15 11.1002/1000/9371-en 6.2 ITU-T G.783 (2006) Amd. 2 2010-03-09 15 11.1002/1000/10400-en6.3 ITU-T G.783 (2006) Amd. 3 2012-02-13 15 11.1002/1000/11486-en6.4 ITU-T G.783 (2006) Amd. 4 2013-08-29 15 11.1002/1000/11983-en_ 1To
13、 access the Recommendation, type into the address line on the web browser the URL http:/handle.itu.int/ followed by the unique ID, for example http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) FOREWORD The International Telecommunication Union (ITU) is the United
14、 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 responsible for studying technical, operating and tariff questions and issuing Recommendat
15、ions 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-T study groups which, in turn, produce Recommendations on these topics. The approv
16、al 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 basis with ISO and IEC. NOTE In this Recommendation, the expression “Administratio
17、n“ 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 mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance
18、 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 use of such words does not suggest that compliance with the Recommendation is req
19、uired 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 no position concerning the evidence, validity or applicability of claimed Intelle
20、ctual 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, protected by patents, which may be required to implement this Recommendation. Howev
21、er, 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 2014 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the pri
22、or written permission of ITU. Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) iii Table of Contents Page 1) Scope 1 2) References. 1 3) Abbreviations and acronyms 1 4) Text modifications in clause 9.2.3.2 . 1 5) New clause 9.3.3 and subclauses 3 6) Text modification in clause 10.2.1.1 6 Rec. ITU-T G.783 (20
23、06)/Amd.4 (08/2013) 1 Recommendation ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 4 Text additions to add the required OSM256.4/RSn_A adaptation function for OSM256.4 interface support 1) Scope Amendment 4 contains modified text to be added
24、 to complete this Recommendation in respect of STM256 multi-lane distribution interfaces. 2) References Add the following reference to clause 2: ITU-T G.959.1 Recommendation ITU-T G.959.1 (2012), Optical transport network physical layer interfaces. 3) Abbreviations and acronyms Add the following abb
25、reviation to clause 4: CID Consecutive Identical Digit 4) Text modifications in clause 9.2.3.2 a) Modify Table 9c in clause 9.2.3.2 and add the text concerning the clock generator process, as shown below: Table 9c OSM256.4_TT_Sk inputs and outputs Input(s) Output(s) OSM256.4_TCP OSM256.4_CI OSM256.4
26、_AP: OSM256.4_AI_D OSM256.4_AI_CK OSM256.4_AI_TSF OSM256.4_TT_Sk_MP OSM256.4_TT_Sk_MI_cLOS OSM256.4_TT_Sk_MI_cLOL Clock generator: The process shall generate the OSM256.4_AP clock from the incoming lane clock. One of the four recovered STL clocks signals can be selected and output as a single clock
27、towards the OSM256.4_AP. 2 Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) b) Modify Figure 9f (as shown in red) in clause 9.2.3.2 to include the recovered clock as part of the STM256.4_AP access point signals. . . .G.783(06)Amd.4(13)_F9-F.OSM_APAI_D AI_TSFSTL AISCA_AISConsequent actions16-byte block datasi
28、gnal multiplexerWRSTL_FS1STL1CKElastic store Elastic storeWRRD RDRD4 lanesWRRDSTL4CKdLOLdSTLAIS1dSTLAIS4dLOFSTL4dLOFSTL1dLOLMI_cLOLdLOLdSTLAIS1dSTLAIS4dLOFSTL4dLOFSTL1STL_FS4WRdLOS4dLOS1dLOS4dLOS1MI_cLOSdSTLAIS44 lanesdSTLAIS1DefectcorrelationOSM256.4_TT_Sk_MPMarker removaland STM-256FASre-creationL
29、ane markerand delayprocessingMarker removaland STM-256FASre-creationLane alignmentrecoveryLane alignmentrecoverySTL AISdetectionSTL AISdetectionSTL_FS1STL1CKSTL_FS4STL4 CKdLOFSTL1 dLOFSTL4STLframealignmentSTLframealignmentSTLCKSTLCKSTL1CK STL4 CKDMod DModODM/WSPayload andclock recoveryPayload andclo
30、ck recoveryLOS detectionLOS detectiondLOS1dLOS4OSM256.4_CPOSM256.4_CIAI_CKFigure 9f OSM256.4_TT_Sk processes Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) 3 5) New clause 9.3.3 and subclauses Add the following new clauses containing additional new adaptations for multi-lane distribution: 9.3.3 STM- 256 mu
31、lti-lane optical section to regenerator section adaptation OSM256.4/RSn_A 9.3.3.1 STM-256 optical section to regenerator section adaptation source OSM256.4/RSn_A _So Symbol G.783(06)-Amd.4(13)_F9-11OSM256.4/RSnRSn_CIOSM256.4_APFigure 9-11 OSM256.4/RSn_A_So symbol Interfaces Table 9-11 OSM256.4/RSn_A
32、_So input and output signals Input Output RSn_CI_Data RSn_CI_Clock RSn_CI_FS OSM256.4_AP OSM256.4_AI_Data OSM256.4_AI_CK OSM256.4_AI_FS Processes This function provides line coding for STM-N signals according to ITU-T G.959.1. This function limits the output jitter on the clock information in the OS
33、M256.4_AI_Data signal as given in Tables 9-6 and 9-7, scaled as described below when measured over a 60-second interval. Jitter generation for SDH regenerator: An SDH regenerator, shall, on its STM-N output, not generate jitter in excess of the values in Tables 9-6 and 9-7 for the serial STM256 stru
34、cture. The frequencies of the related jitter limit values of the optical per lane signals are scaled down by the factor of 4 with respect to the STM256 values given in Tables 9-6 and 9-7. Note that frequency downscaling leads to the fact that the UIp-p amplitude is also scaled up by the factor of 4
35、in terms of nanoseconds. On this basis, a deployed regenerator shall not generate jitter on its OSM256.4 output in excess of those values, with the down-scaled frequencies and up-scaled amplitude as given above, in nanoseconds. Defects None. Consequent actions None. 4 Rec. ITU-T G.783 (2006)/Amd.4 (
36、08/2013) Defect correlations None. Performance monitoring None. 9.3.3.2 STM-N optical section to regenerator section adaptation sink OSM256.4/RSn_A_Sk Symbol G.783(06)-Amd.4(13)_F9-12OSM256.4/RSnRSn_CIOSM256.4OSM256.4/RSn_A_Sk_MIFigure 9-12 OSM256.4/RSn_A_Sk symbol Interfaces Table 9-12 OSM256.4/RSn
37、_A_Sk input and output signals Inputs Outputs OSM256.4_AI_Data OSM256.4_AI_CK OSM256.4_AI_TSF RSn_CI_Data RSn_CI_Clock RSn_CI_FS RSn_CI_SSF OSM256.4/RSn_A_Sk_MI_cLOF OSM256.4/RSn_A_Sk_MI_pOFS Processes The OSM256.4_AI_Data signal, with its contained timing, is received by the OSM256.4_AP from the OS
38、M256.4_TT_Sk function. The OSM256.4/RSn function processes this 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-256 data and timing are presented at the RSn_CP. Rege
39、neration: The function shall operate with a maximum BER of 1012when any combination of the following signal conditions exists at the input: an input optical power level within the range specified in ITU-T G.959.1; jitter modulation applied to the input signal as specified in ITU-T G.825; the input s
40、ignal bit rate has a value in the range 256 155 520 kbit/s 20 ppm. NOTE 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 (CID) in the STM-N signal, the fun
41、ction shall comply with the specification in clause 15.1.4. Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) 5 The function shall process the signal so 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
42、 clause 15.1.2. For the multi-lane case, the frequencies of the related jitter limit values of the optical per lane signals are scaled down by the factor of 4 in respect to the STM256 values. The frequency downscaling leads to the fact that the absolute UIp-p amplitude is also scaled up by the facto
43、r of 4 in terms of nanoseconds. The function shall process the signal so that the jitter transfer (measured between an STM-N input and STM-N output in a regenerative repeater) shall be as specified in clause 15.1.3. For the multi-lane case, the frequencies of the related jitter limit values of the o
44、ptical per lane signals are scaled down by the factor of 4 in respect to the STM256 values. The frequency downscaling leads to the fact that the UIp-p amplitude is also scaled up by the factor of 4 in terms of nanoseconds. The frame alignment process is described in clause 8.2.1. Defects dLOF: see c
45、lause 6.2.5.1. Consequent actions The function shall perform the following consequent actions: aAIS dLOF or AI_TSF aSSF dLOF or AI_TSF 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,
46、 the function shall output normal data within 250 s. Defect correlations The function shall perform the following defect correlations to determine the most probable fault cause. This fault cause shall be reported to the SEMF. cLOF dLOF and (not AI_TSF) Performance monitoring The function shall perfo
47、rm the following performance monitoring primitives processing: Any second with at least one OOF event shall be reported as a pOFS (optional in ITU-T G.784). 6 Rec. ITU-T G.783 (2006)/Amd.4 (08/2013) 6) Text modification in clause 10.2.1.1 Modify clause 10.2.1.1, adding the text indicated below to Ta
48、ble 10-1 and by adding the additional paragraph to the “Processes“ section of the clause, as shown below: Table 10-1 RSn_TT_So function inputs and outputs Inputs Outputs RSn_AI_Data RSn_AI_Clock RSn_AI_FrameStart RSn_TT_So_MI_TxTI RSn_CI_Data RSn_CI_Clock RSn_CI_Fs (Note) NOTE The RSn_CI_Fs (RSn fra
49、me start signal) is optional for support of OSM256.4 interfaces for frame start forwarding to the OSM256.4_TT_So and not a generic requirement. Processes Data at the RSn_AP is an STM-N signal as defined in ITU-T G.707 having a valid multiplex section overhead (MSOH) and E1, D1-D3, F1 and NU bytes. However, the bytes A1, A2, B1, and J0 are indeterminate in this signal. A1, A2, B1, and J0 bytes are set in accordance with ITU
