1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T Series G TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 58 (02/2016) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Optical transport network (OTN) module framer interfaces (MFIs) ITU-T G
2、-series Recommendations Supplement 58 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.200G.299 INDIVIDUAL CHARACTERIST
3、ICS 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 TELEPHONY G.450G.499 TRANSMISSIO
4、N MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL 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
5、 G.6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. G series Supplement 58 (02/2016) i Supplement 58 to ITU-T G-series Recommendations Optical tr
6、ansport network (OTN) module framer interfaces (MFIs) Summary Supplement 58 to ITU-T G-series Recommendations describes several interoperable component-to-component multilane interfaces (across different vendors) to connect an optical module (with or without digital signal processor (DSP) to a frame
7、r device in a vendors equipment supporting 40G, 100G or beyond 100G optical transport network (OTN) interfaces. Only the structure of the 11G or 28G physical lanes of the different OTN module framer interface (MFI) examples is provided in this Supplement. For their electrical characteristics, the OI
8、F-CEI-03.1 IA specifications can be used. This Supplement relates to Recommendation ITU-T G.709/Y.1331. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T G Suppl. 58 2016-02-26 15 11.1002/1000/12839 * To access the Recommendation, type the URL http:/handle.itu.int/ in the addr
9、ess field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii G series Supplement 58 (02/2016) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications,
10、 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 telecommunications on
11、 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 the procedure laid do
12、wn 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 publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication ad
13、ministration and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the publication is achieved when all of these mandatory provisions
14、 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 publication is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the pos
15、sibility that the practice or implementation of this publication 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 ITU members or others outside of the pu
16、blication development process. As of the date of approval of this publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. However, implementers are cautioned that this may not represent the latest information and a
17、re therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. G series Supplement 58 (02/2016) iii Table of Contents Pa
18、ge 1 Scope . 1 2 References . 1 3 Definitions 1 4 Abbreviations and acronyms 1 5 Conventions 1 6 Introduction . 2 7 Signal formats and rates carried over 11G electrical lanes . 2 7.1 OTL3.4 structure 2 7.2 OTL4.10 structure 3 8 Signal formats and rates carried over 28G electrical lanes . 3 8.1 OTL4.
19、4 structure 4 8.2 OTLC.4 structure 4 Bibliography. 6 G series Supplement 58 (02/2016) 1 Supplement 58 to ITU-T G-series Recommendations Optical transport network (OTN) module framer interfaces (MFIs) 1 Scope This Supplement describes multilane interfaces between an optical transport network (OTN) fr
20、amer device and an optical module with or without digital signal processor (DSP) (module framer interface). The module framer interfaces (MFIs) described in this Supplement carry optical transport unit k (OTUk; k = 3, 4) or optical transport unit Cn (OTUCn) signals. Electrical parameters for these i
21、nterfaces can use specifications provided in the relevant clauses of b-OIF-CEI-03.01. 2 References ITU-T G.652 Recommendation ITU-T G.652 (2009), Characteristics of a single-mode optical fibre and cable. ITU-T G.695 Recommendation ITU-T G.695 (2015), Optical interfaces for coarse wavelength division
22、 multiplexing applications. ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2012), Interfaces for the optical transport network. ITU-T G.959.1 Recommendation ITU-T G.959.1/Y.1331 (2016), Optical transport network physical layer interfaces. 3 Definitions None. 4 Abbreviations and acronyms This Supplem
23、ent uses the following abbreviations and acronyms: DSP Digital Signal Processor LLM Logical Lane Marker MFI Module Framer Interface OTL Optical Transport Lane OTLC.n group of n Optical Transport Lanes that carry one OTUC of an OTUCn OTLk.n group of n Optical Transport Lanes that carry one OTUk OTN O
24、ptical Transport Network OTU Optical Transport Unit OTUCn Optical Transport Unit Cn OTUk Optical Transport Unit k WDM Wavelength Division Multiplexing 5 Conventions Transmission order: The order of transmission of information in all the figures in this supplement is first from left to right and then
25、 from top to bottom. Within each byte, the most significant bit is transmitted first. The most significant bit (bit 1) is illustrated at the left in all the figures. 2 G series Supplement 58 (02/2016) 6 Introduction This Supplement begins with some examples of first generation module framer interfac
26、e (MFI) for OTU3 and OTU4 signals carried over multiple 11G electrical lanes (using OTL3.4 and OTL4.10 structures, respectively). Then it describes some examples of second generation MFI for OTU4 and OTUC.n signals carried over multiple 28G electrical lanes (using OTL4.4 and OTLC.4 structures, respe
27、ctively). Note that in the case of an OTUCn signal, n OTLC.4 interface structures are used. Users of this Supplement should not assume that possible MFIs are limited to the ones provided in clauses 7 and 8. 7 Signal formats and rates carried over 11G electrical lanes This clause describes some MFI s
28、tructures using 11G physical lanes in order to carry 40G OTU3 or 100G OTU4 signals. The electrical characteristics of each 11G physical lane may comply with b-OIF-CEI-03.1 CEI-11G-xR specifications. 7.1 OTL3.4 structure The original purpose of the OTL3.4 interface, as defined in clause 8.1 and Annex
29、 C of ITU-T G.709, was to enable the re-use of pluggable modules developed for Ethernet 40GBASE-R applications. Modules developed for b-IEEE 802.3 40GBASE-LR4 and 40GBASE-ER4 can have corresponding optical specifications for OTU3 interfaces with application codes C4S1-2D1 and C4L1-2D1, respectively,
30、 in ITU-T G.695. These modules have a four-lane wavelength division multiplexing (WDM) interface to and from a transmit/receive pair of ITU-T G.652 optical fibres. These pluggable modules use a four-lane electrical chip-to-module interface (XLAUI), whose specification is found in Annex 83B of b-IEEE
31、 802.3. These modules include a simple retimer. This application of the OTL3.4 interface is found in Figure 7-1. Figure 7-1 Illustration of the application of an OTL3.4 interface Another application example of the OTL3.4 interface is to connect a 40G OTN framer and optical line DSP (ODSP) devices in
32、 order to carry an OTU3 signal. The bit rates of the OTL3.4 lanes are specified in ITU-T G.709 and indicated in Table 7-1. Table 7-1 Bit rates of OTL3.4 OTL type OTL nominal bit rate OTL bit-rate tolerance OTL3.4 4 255/236 9 953 280 kbit/s 20 ppm OTL3.4 lane 255/236 9 953 280 kbit/s 20 ppm NOTE The
33、nominal OTL3.4 lane bit rate is approximately: 10 754 603.390 kbit/s. G series Supplement 58 (02/2016) 3 7.2 OTL4.10 structure The original purpose of the OTL4.10 interface, as defined in clause 8.1 and Annex C of ITU-T G.709, was to enable the re-use of first generation pluggable modules developed
34、for Ethernet 100GBASE-R applications. Modules developed for b-IEEE 802.3 specified 100GBASE-LR4 and 100GBASE-ER4. They have corresponding optical specifications for OTU4 interfaces with the optical parameters as specified for the application codes 4I1-9D1F and 4L1-9C1F, respectively, in ITU-T G.959.
35、1. Non-IEEE specified optical interfaces include ITU-T G.695 application code C4S1-9D1F and ITU-T G959.1 application code 4L1-9D1F. These modules have a four-lane WDM interface to and from a transmit/receive pair of ITU-T G.652 optical fibres. These first generation modules connect to the host board
36、 via a ten-lane electrical interface. The conversion between ten and four lanes is performed using a 100GBASE-R b-IEEE 802.3 PMA sublayer as specified in clause 83 of b-IEEE 802.3. The specification of the ten-lane electrical chip-to-module interface (CAUI-10) is found in Annex 83B of b-IEEE 802.3.
37、The application of the OTL4.10 interface is illustrated in Figure 7-2. Figure 7-2 Illustration of the original application of an OTL4.10 interface Another application example of the OTL4.10 interface is to connect first generation 100G OTN framers with optical line DSP (ODSP) devices in order to car
38、ry an OTU4 signal. Each OTL4.10 lane carries two bit-multiplexed logical lanes of an OTU4 as described in Annex C of ITU-T G.709. The logical lane format has been chosen so that the b-IEEE 802.3 10:4 PMA (gearbox) will convert the OTU4 signal between a format of ten lanes of OTL4.10 and four lanes o
39、f OTL4.4. Each OTL4.4 lane carries five bit-multiplexed logical lanes of an OTU4 as described in Annex C of ITU-T G.709. The bit rate of an OTL4.10 lane is specified in Table 7-2. Table 7-2 Bit rates of OTL4.10 OTL type OTL nominal bit rate OTL bit-rate tolerance OTL4.10 10 255/227 9 953 280 kbit/s
40、20 ppm OTL4.10 lane 255/227 9 953 280 kbit/s 20 ppm NOTE The nominal OTL4.10 lane bit rate is approximately: 11 180 997.357 kbit/s. 8 Signal formats and rates carried over 28G electrical lanes This clause describes some MFI structures using 28G physical lanes in order to carry 100G OTU4 or B100G OTU
41、Cn signals. The electrical characteristics of each 28G physical lane may comply with b-OIF CEI-03.1 CEI-28G-xR specifications. 4 G series Supplement 58 (02/2016) 8.1 OTL4.4 structure The original purpose of the OTL4.4 interface, as defined in clause 8.1 and Annex C of ITU-T G.709, was to enable the
42、re-use of second (and beyond) generation pluggable modules developed for Ethernet 100GBASE-R applications. Modules developed for b-IEEE 802.3 specified 100GBASE-LR4 and 100GBASE-ER4. They have corresponding optical specifications for OTU4 interfaces with the optical parameters as specified for the a
43、pplication codes 4I1-9D1F and 4L1-9C1F, respectively, in ITU-T G.959.1. Non-IEEE specified optical interfaces include ITU-T G.695 application code C4S1-9D1F and ITU-T G959.1 application code 4L1-9D1F. These modules have a four-lane WDM interface to and from a transmit/receive pair of ITU-T G.652 opt
44、ical fibres. Most second generation (and beyond) pluggable modules use a four-lane electrical chip-to-module interface (CAUI-4), whose specification is found in b-IEEE 802.3 Annex 83E. These modules include a simple retimer (as opposed to the 10:4 gearbox found in first generation modules). This app
45、lication of the OTL4.4 interface is illustrated in Figure 8-1. Figure 8-1 Illustration of the original application of an OTL4.4 interface Another application example of the OTL4.4 interface is to connect second generation multi-100G OTN framers with optical line DSP (ODSP) devices in order to carry
46、independent OTU4 signals and to connect these framers with emerging line side optical modules. Each OTL4.4 lane carries five bit-multiplexed logical lanes of an OTU4 as described in Annex C of ITU-T G.709. The bit rates of the OTL4.4 are specified in ITU-T G.709 indicated in Table 8-1. Table 8-1 Bit
47、 rates of OTL4.4 OTL type OTL nominal bit rate OTL bit-rate tolerance OTL4.4 4 255/227 24 883 200 kbit/s 20 ppm OTL4.4 lane 255/227 24 883 200 kbit/s 20 ppm NOTE The nominal OTL4.4 lane bit rate is approximately: 27 952 493.392 kbit/s. 8.2 OTLC.4 structure In B100G OTN design, the interfaces between
48、 the B100G OTN framer and ODSP devices will support OTU4 and OTUCn signals. This interface benefits from a common interface format. The purpose of the OTLC.4 interfaces is to support such a common interface format based on the existing OTL4.4 format. These interfaces carry either four physical lanes
49、 of an OTU4 (i.e., OTL4.4) or OTUCn (i.e., OTLC.4). See Figure 8-2. G series Supplement 58 (02/2016) 5 Figure 8-2 Example applications of an OTL4.4/OTLC.4 interface An OTUCn is split into n times OTUC and each OTUC frame is extended with 256 FEC columns at the end of the frame which contain a RS (255,239) FEC as specified for the OTUk in Annex A of ITU-T G.709. Each OTUC frame with RS (255,239) FEC therefore results in an octet-
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