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 (02/2018) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Optical transport network module framer interfaces ITU-T G-series Recom
2、mendations 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 CHARACTERISTICS OF INTERN
3、ATIONAL 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 TRANSMISSION MEDIA AND O
4、PTICAL 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 G.6000G.6999
5、 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 (02/2018) i Supplement 58 to ITU-T G-series Recommendations Optical transport netwo
6、rk module framer interfaces 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 a digital signal processor (DSP) to a framer device in a vendors equ
7、ipment supporting 40G, 100G or beyond 100G optical transport network (OTN) interfaces. Only the structure of the 11G, 28G or 56G physical lanes of the different OTN module framer interface (MFI) examples is provided in this Supplement. For their electrical characteristics, the OIF-CEI Implementation
8、 Agreement (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 2.0 ITU-T G Suppl. 58 2017-06-30 15 11.1002/1000/13343 3.0 ITU-T G Suppl. 58
9、 2018-02-09 15 11.1002/1000/13584 Keywords FOIC, Framer, interface, module, MFI, OTL, OTN. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en.
10、ii G series Supplement 58 (02/2018) 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 o
11、f ITU. ITU-T is responsible 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 topi
12、cs 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 down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prep
13、ared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this publication is voluntary. However, the publication may contain
14、 certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the publication 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 requi
15、rements. 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 possibility that the practice or implementation of this publication may involve the use of a claimed Intellectual Property Right. ITU
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17、, protected by patents, which may be required to implement this publication. 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 2018 All rights reserved. No pa
18、rt of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. G series Supplement 58 (02/2018) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 4 Abbreviations and acronyms 1 5 Conventions 2 6 Introduction . 2 7 Signal formats
19、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 . 4 8.1 OTL4.4 structure 4 8.2 OTLC.4 structure 5 8.3 FOIC1.4 structure . 6 8.4 FOIC2.8 and FOIC4.16 structures 8 9 Signal formats and rates car
20、ried over 56G electrical lanes . 9 9.1 FOIC1.2 structure . 10 9.2 FOIC2.4 and FOIC4.8 structures 11 Bibliography. 15 G series Supplement 58 (02/2018) 1 Supplement 58 to ITU-T G-series Recommendations Optical transport network module framer interfaces 1 Scope This Supplement describes multilane inter
21、faces between an optical transport network (OTN) framer device and an optical module with or without a 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
22、Cn (OTUCn) signals. Electrical parameters for these interfaces can use specifications provided in the relevant clauses of OIF-CEI Implementation Agreement (IA) specifications. 2 References ITU-T G.652 Recommendation ITU-T G.652 (2016), Characteristics of a single-mode optical fibre and cable. ITU-T
23、G.695 Recommendation ITU-T G.695 (2018), Optical interfaces for coarse wavelength division multiplexing applications. ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2016), Interfaces for the optical transport network. ITU-T G.709.1 Recommendation ITU-T G.709.1/Y.1331.1 (2018), Flexible OTN short-rea
24、ch interface. ITU-T G.959.1 Recommendation ITU-T G.959.1 (2018), Optical transport network physical layer interfaces. 3 Definitions None. 4 Abbreviations and acronyms This Supplement uses the following abbreviations and acronyms: AM Alignment Marker DSP Digital Signal Processor FCC FlexO Communicati
25、ons Channel FEC Forward Error Correction FlexO Flexible Optical transport network FlexO-m group of m bonded short-reach FlexO-SR interfaces that carry an OTUCn FOIC FlexO-SR Interface IA Implementation Agreement LD Local Degrade LLM Logical Lane Marker MFAS Multi-Frame Alignment Signal MFI Module Fr
26、amer Interface 2 G series Supplement 58 (02/2018) ODSP Optical line DSP OH Overhead area OSMC OTN Synchronization Messaging Channel OTL Optical Transport Lane OTN Optical Transport Network OTUCn Optical Transport Unit Cn OTUk Optical Transport Unit k PAD pad area PAM4 Pulse Amplitude Modulation, fou
27、r-level RS Reed-Solomon 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 from top to bottom. Within each byte, the most significant bit is transmitted first. The
28、most significant bit (bit 1) is illustrated at the left in all the figures. 6 Introduction This Supplement begins with some examples of first generation MFIs for OTU3 and OTU4 signals carried over multiple 11G electrical lanes (using OTL3.4 and OTL4.10 structures, respectively). Then this Supplement
29、 describes some examples of second generation MFIs for OTU4 and OTUCn signals carried over multiple 28G electrical lanes (using OTL4.4, OTLC.4, FOIC1.4, FOIC2.8 or FOIC4.16 structures, respectively). Note that in the case of an OTUCn signal, n OTLC.4 or m FOICx.k interface structures are used. Final
30、ly, this Supplement describes some examples of third generation MFIs for OTUCn signals carried over multiple 56G electrical lanes (using FOIC1.2, FOIC2.4 or FOIC4.8 structures, respectively). Note that m FOICx.k interfaces (FlexO-m group) are used to carry an OTUCn signal. Users of this Supplement s
31、hould not assume that possible MFIs are limited to the ones provided in clauses 7, 8 and 9. 7 Signal formats and rates carried over 11G electrical lanes This clause describes some MFI structures using 11G physical lanes in order to carry 40G OTU3 or 100G OTU4 signals. The electrical characteristics
32、of each 11G physical lane may comply with b-OIF-CEI IA 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 C of ITU-T G.709, was to enable the re-use of pluggable modules developed for Ethernet 40GBASE-R applications. Modul
33、es 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, in ITU-T G.695. These modules have a four-lane wavelength division multiplexing (WDM) interface to and from a transm
34、it/receive pair of ITU-T G.652 optical fibres. G series Supplement 58 (02/2018) 3 These pluggable modules use a four-lane electrical chip-to-module interface (XLAUI), whose specification is found in Annex 83B of b-IEEE 802.3. These modules include a simple retimer. This application of the OTL3.4 int
35、erface 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 order to carry an OTU3 signal. The bit rates of the OTL3.4 lanes are specified in
36、 ITU-T G.709 and indicated in Table 7-1. Table 7-1 Bit rates of OTL3.4 Optical transport lane (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 nominal OTL3.4 lane bit rate is approximately: 10 754 603
37、.390 kbit/s. 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 for Ethernet 100GBASE-R applications. Modules developed for b-IEEE 802.3 specified 100GBASE-
38、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.959.1. Non-IEEE specified optical interfaces include ITU-T G.695 application code C4S1-9D1F and
39、ITU-T G.959.1 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 via a 10-lane electrical interface. The conversion between 10 and four lanes is performed
40、using a 100GBASE-R b-IEEE 802.3 PMA sublayer as specified in clause 83 of b-IEEE 802.3. The specification of the 10-lane electrical chip-to-module interface (CAUI-10) is found in Annex 83B of b-IEEE 802.3. The application of the OTL4.10 interface is illustrated in Figure 7-2. Figure 7-2 Illustration
41、 of the original application of an OTL4.10 interface 4 G series Supplement 58 (02/2018) Another application example of the OTL4.10 interface is to connect first generation 100G OTN framers with ODSP devices in order to carry an OTU4 signal. Each OTL4.10 lane carries two bit-multiplexed logical lanes
42、 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 10 lanes of OTL4.10 and four lanes of OTL4.4. Each OTL4.4 lane carries five bit-multiplexed logical lanes of an OTU
43、4 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 20 ppm OTL4.10 lane 255/227 9 953 280 kbit/s 20 ppm NOTE The nominal OTL4.10 la
44、ne 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 OTUCn signals. The electrical characteristics of each 28G physical lane may comply
45、 with b-OIF-CEI IA CEI-28G-xR specifications. 8.1 OTL4.4 structure The original purpose of the OTL4.4 interface, as defined in this clause and Annex C of ITU-T G.709, was to enable the re-use of second (and beyond) generation pluggable modules developed for Ethernet 100GBASE-R applications. Modules
46、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.959.1. Non-IEEE specified optical interfaces inclu
47、de ITU-T G.695 application code C4S1-9D1F and ITU-T G.959.1 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. Most second generation (and beyond) pluggable modules use a four-lane electrical chip-to-module inter
48、face (CAUI-4), whose specification is found in Annex 83E of b-IEEE 802.3. These modules include a simple retimer (as opposed to the 10:4 gearbox found in first generation modules). This application of the OTL4.4 interface is illustrated in Figure 8-1. Figure 8-1 Illustration of the original applicat
49、ion of an OTL4.4 interface Another application example of the OTL4.4 interface is to connect second generation multi-100G OTN framers with ODSP devices in order to carry independent OTU4 signals and to connect these framers with emerging line side optical modules. G series Supplement 58 (02/2018) 5 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.
