1、 7 International Telecommunication Union ITU-T G.783TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 2(03/2010) 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 2: Support for optical modules transporting 40 Gigabit/s signals via a multilane interface Recommendation ITU-T G.783 (2006) Amendment 2 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDI
3、A, 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 CHARACTERISTIC
4、S 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.700G.799 Gene
5、ral 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 characteristics
6、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 DIGITAL NETWO
7、RKS 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.8000G.8999 A
8、CCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.783 (2006)/Amd.2 (03/2010) i Recommendation ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 2 Support for optical modules transpor
9、ting 40 Gigabit/s signals via a multilane interface Summary Amendment 2 to Recommendation ITU-T G.783 adds to the Recommendation the optical multilane interface of four optical lanes for STM-256. History Edition Recommendation Approval Study Group 1.0 ITU-T G.783 1990-12-14 XV 2.0 ITU-T G.783 1994-0
10、1-20 15 3.0 ITU-T G.783 1997-04-08 15 4.0 ITU-T G.783 2000-10-06 15 4.1 ITU-T G.783 (2000) Cor. 1 2001-03-15 15 4.2 ITU-T G.783 (2000) Amend. 1 2002-06-13 15 4.3 ITU-T G.783 (2000) Cor. 2 2003-03-16 15 5.0 ITU-T G.783 2004-02-06 15 5.1 ITU-T G.783 (2004) Cor. 1 2004-06-13 15 5.2 ITU-T G.783 (2004) A
11、mend. 1 2005-07-14 15 6.0 ITU-T G.783 2006-03-29 15 6.1 ITU-T G.783 (2006) Amend. 1 2008-05-22 15 6.2 ITU-T G.783 (2006) Amend. 2 2010-03-09 15 ii Rec. ITU-T G.783 (2006)/Amd.2 (03/2010) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of
12、 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 Recommendations on them with a view to standardizing t
13、elecommunications 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 covered by t
14、he 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 indicate both
15、 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 achieved when al
16、l 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 PROPERTY RI
17、GHTS 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 asserted by I
18、TU 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. However, implementers are cautioned that this may
19、 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 2010 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.7
20、83 (2006)/Amd.2 (03/2010) iii CONTENTS Page 1) Scope 1 2) Changes to Recommendation ITU-T G.783 . 1 2.1) Clause 2, References 1 2.2) Clause 4, Abbreviations 1 2.3) New clauses 6.2.5.6 and 6.2.5.7 . 1 2.4) New clauses 8.2.6 and 8.2.7 . 2 2.5) New clause 9.2.3 . 3 Rec. ITU-T G.783 (2006)/Amd.2 (03/201
21、0) 1 Recommendation ITU-T G.783 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks Amendment 2 Support for optical modules transporting 40 Gigabit/s signals via a multilane interface 1) Scope This amendment contains material to be added to Recommendation ITU-T G.783,
22、for the support of optical modules for the transport of 40 Gigabit/s signals implementing a multilane interface, consisting of four optical 10 Gigabit/s signals. 2) Changes to Recommendation ITU-T G.783 The following clauses contain changes to be made to Rec. ITU-T G.783. 2.1) Clause 2, References a
23、) Add the following references to clause 2: ITU-T G.695 Recommendation ITU-T G.695 (2009), Optical interfaces for coarse wavelength division multiplexing applications. ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2009), Interfaces for the optical transport network (OTN). b) Update ITU-T G.707/Y.13
24、22 as follows: ITU-T G.707 Recommendation ITU-T G.707/Y.1322 (2007), Network node interface for the synchronous digital hierarchy (SDH). 2.2) Clause 4, Abbreviations Add the following abbreviations to clause 4: OSMn.m Optical Section Multilane, n = 256, m = 4 STL-n.m Synchronous Transport Lane of ST
25、M-n (n = 256) mapped over m (m = 4) parallel lanes (see ITU-T G.707). 2.3) New clauses 6.2.5.6 and 6.2.5.7 Add the following clauses subsequent to clause 6.2.5.5: 6.2.5.6 STL loss of lane alignment defect (dLOL) STL-n.m dLOL is generated for interfaces of OSMn.m based on the state of the lane alignm
26、ent process of the multilane STL-n.m signals defined in clause 8.2.7. If the multilane alignment process is in the out-of-alignment (OLA) state for 3 ms, dLOL shall be declared. To provide for the case of intermittent OLA, the integrating timer shall not be reset to zero until an in-lane alignment (
27、ILA) condition persists continuously for 3 ms. dLOL shall be cleared when the ILA state persists continuously for 3 ms. 2 Rec. ITU-T G.783 (2006)/Amd.2 (03/2010) 6.2.5.7 Loss of frame defect of STL (dLOFSTL) The lost of frame defect of a lane on a multilane signal dLOFSTL is generated based on the s
28、tate of the frame alignment process defined in clause 8.2.6. If the frame alignment process is in the out-of-frame (OOF) state for 3 ms, dLOFSTL shall be declared. To provide for the case of intermittent OOFs, the integrating timer shall not be reset to zero until an in-frame (IF) condition persists
29、 continuously for 3 ms. dLOFSTL shall be cleared when the IF state persists continuously for 3 ms. 2.4) New clauses 8.2.6 and 8.2.7 Add the following clauses subsequent to clause 8.2.5.2: 8.2.6 STL-256.4 frame alignment of STM-256 multilane interface The frame alignment shall be found by searching f
30、or the 16 A1 followed by 15 A2 bytes (see Annex I of ITU-T G.707) contained in each lane of the STL-256.4 signal. The framing pattern searched for may be a subset of the A1 and A2 bytes contained on the STL-256.4 signal. The frame signal shall be continuously checked with the presumed frame start po
31、sition for the alignment. If in the in-frame state (IF), the maximum out-of-frame (OOF) detection time shall be 625 s for a random unframed signal. The algorithm used to check the alignment shall be such that, under normal conditions, a 103(Poisson type) error ratio will not cause a false OOF more t
32、han once per 6 minutes. If in the OOF state, the maximum frame alignment time shall be 250 s for an error-free signal with no emulated framing patterns. The algorithm used to recover from the OOF state shall be such that the probability for false frame recovery with a random unframed signal shall be
33、 no more than 105per 250 s time interval. 8.2.7 STL-256.4 lane alignment of STM-256 multilane interface The STL-256.4 lane alignment process is used in re-establishing alignment of the lanes of the STM-256 multilane signal. The process has two sub-processes: STL-256.4 logical lane marker recovery (p
34、er lane); STL-256.4 multi-lane alignment. The bytes of the STM-256 signal are distributed to the lanes in 16-byte increments. The lane alignment signal per-lane is encoded in the byte following the 15th A2 byte. An STL-256.4 logical lane marker recovery process is present per logical lane to recover
35、 the logical lane marker value and frame alignment number. A new value of the STL-256.4 logical lane marker and frame alignment number are accepted when in five consecutive 155520-byte periods the same value is present in bits 7-8 of the byte following the 15th A2 byte, and consecutive incrementing
36、values are present in bits 1-6 of the byte following the 15th A2 byte. When these conditions are met, the recovery process will enter the in-recovery (IR) state. In the IR state, recovery will be lost and the out-of-recovery (OOR) state be entered, when in each of five consecutive 155520-byte period
37、s a value is received in bits 7-8 that is not the same as the accepted logical lane marker value, or the value received in bits 1-6 does not match a locally incremented frame alignment number. The STL-256.4 multi-lane alignment process has two states: out-of-lane alignment (OLA) and in-lane alignmen
38、t (ILA). The lane data for each lane is written into an elastic store, together with an indication of the start of frame boundary and frame alignment number. If all lanes are in the IR state and have unique lane marker values, and data is present in the elastic store for realignment with respect to
39、creating consistent data of consecutive STM-256 frames with respect to the lane alignment signal, the ILA state shall be entered. In the case that lane identification for all lanes is not detected in a consistent way, the OLA state shall be entered. Rec. ITU-T G.783 (2006)/Amd.2 (03/2010) 3 2.5) New
40、 clause 9.2.3 Add the following clauses subsequent to clause 9.2.2.2: 9.2.3 OSM256.4_TT trail termination function The OSM256.4_TT functions are responsible for the end-to-end termination of the OSM256.4 trail. Figure 9b shows the combination of the unidirectional sink and source functions to form a
41、 bidirectional function. OSM256.4_APOSM256.4_TCPOSM256.4OSM256.4_APOSM256.4_TCPOSM256.4G.783(06)Amd.2(10)_F9-BFigure 9b OSM256.4_TT 9.2.3.1 OSM256.4_TT trail termination source function The information flow and processing of the OSM256.4_TT_So function is defined with reference to Figure 9c. The OSM
42、256.4_TT_So function conditions the data for transmission over the optical medium using the multilane format. For this, the OSM256.4_TT_So generates the STL-256.4 signal within the physical specifications of ITU-T G.695. Symbol G.783(06)Amd.2(10)_F9-COSM256.4_APOSM256.4_TCPOSM256.4OSM256.4_TT_So_MPF
43、igure 9c OSM256.4_TT_So function 4 Rec. ITU-T G.783 (2006)/Amd.2 (03/2010) Interfaces Table 9b OSM256.4_TT_So inputs and outputs Input(s) Output(s) OSM256.4_AP OSM256.4_AI OSM256.4_CK OSM256.4_AI_FS OSM256.4_TCP OSM256.4_CI Processes The processes associated with the OSM256.4_TT function are specifi
44、c processes for each lane signal of the OSM256.4 and common processes for the compound signal as depicted in Figure 9d. Common processes PN-11 detection: The process shall detect the generic AIS signal as described in ITU-T G.709. 16-byte block distributer: The function shall, round robin, distribut
45、e the STM-256 signal as defined in Annex I of ITU-T G.707 to the related lane structure of four logical lanes. The distribution is aligned to the STM-256 frame. In the event that no frame start signal is present due to the presence of an unframed generic AIS signal, the serial stream shall be arbitr
46、arily distributed in 16-byte blocks to the lanes. Lane specific processes Multilane identifier insertion: The function shall insert the multilane identifier as defined in Annex I of ITU-T G.707. The multilane identifier replaces the 16th A2 byte position in the STL framing pattern (resulting from th
47、e STM-256 FAS signal after it has been distributed in 16-byte increments across the lanes). In the case that no STM-256 frame is present (no FS indication), no identifier shall be inserted. STLAIS generation and insertion: The process shall insert the STLAIS indication by replacing 32 bytes on each
48、lane after every 155488th byte of the unstructured PN-11 pattern (distributed in 16-byte increments across the lanes) with 16 A1 bytes, followed by 15 A2 bytes, followed by a 0xFF fixed value. Optical carrier modulation and wavelength assignment (MOD/WA): For the parameters on the optical lanes (STL
49、-256.4), see ITU-T G.695. Common processes Optical multiplexing (OM): See ITU-T G.709. Rec. ITU-T G.783 (2006)/Amd.2 (03/2010) 5 G.783(06)Amd.2(10)_F9-DaSTLAISOSM256.4_APAI_DOSM256.4_APAI_CKOSM256.4_APAI_FSGenericAISdetector16-byte blockdistributerMultilaneidentifierinsertionMultilaneidentifierinsertionMultilaneidentifierinsertionMultilaneidentifierinsertionaSTLAISSTL AISinsertionSTL AISinsertionSTL AISinsertionSTL AISinsertionMod/WA Mod/WA Mod/WA Mod/WAOMOSM256.4_CPOSM256.4_CIFigure 9d OSM256.4_TT_So processes Def
