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T-REC-G.Sup43-200812-I!!MSW-E

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T-REC-G.Sup43-200812-I!!MSW-E

    International Telecommunication Union

    ITU-T Series G TELECOMMUNICATION Supplement 43 STANDARDIZATION SECTOR (12/2008) OF ITU

SERIES G: TRANSMISSION SYSTEMS AND MEDIA,

    DIGITAL SYSTEMS AND NETWORKS

     Transport of IEEE 10GBASE-R in optical transport networks (OTN)

    ITU-T G-series Recommendations Supplement 43

    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-G.200G.299 TRANSMISSION SYSTEMS

    INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE G.300G.399 SYSTEMS ON METALLIC LINES

    GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS G.400G.449 ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES

    COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISSION 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 QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED G.1000G.1999 ASPECTS

    TRANSMISSION MEDIA CHARACTERISTICS 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.

Supplement 43 to ITU-T G-series Recommendations

    Transport of IEEE 10GBASE-R in optical transport networks (OTN)

Summary

    Supplement 43 to ITU-T G-series Recommendations describes several approaches for transport of 10G LAN PHY over SDH and OTN transport networks. As some of these approaches use rates,

    formats and mappings that are not defined in ITU-T Recommendations, this supplement analyses

    various attributes of the different approaches to provide guidance regarding their applicability to

    different network contexts.

    This supplement relates to Recommendations ITU-T G.872, G.709/Y.1331, G.798, G.707/Y.1322,

    G.8010/Y.1306, G.8012/Y.1308, G.959.1 and G.696.1

Source

    Supplement 43 to ITU-T G-series Recommendations was agreed on 12 December 2008 by

    ITU-T Study Group 15 (2009-2012).

     G series Supplement 43 (12/2008) i

    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 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 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 down in WTSA Resolution 1. In some areas of information technology which fall within ITU-T's 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 administration 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 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 RIGHTS;

    ITU draws attention to the possibility 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 publication 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 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 of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU.

    ii G series Supplement 43 (12/2008)

    CONTENTS

     Page

    1 Scope ........................................................................................................................ 1

    2 References ................................................................................................................ 1

    3 Definitions ................................................................................................................ 2

    4 Abbreviations and acronyms ..................................................................................... 2 5 Conventions .............................................................................................................. 3 6 Standard mappings .................................................................................................... 3

    6.1 10GBASE-W (WAN PHY) via STM-64 ..................................................... 3

    6.2 GFP-F mapping of 10GBASE-R (LAN PHY) payload only into OPU2 ....... 3

    7 Non-standard mappings ............................................................................................. 3

    7.1 Bit transparent mapping of 10GBASE-R signal into OPU2e ........................ 4

    7.2 Bit transparent mapping of 10GBASE-R signal into OPU1e ........................ 4

    7.3 ITU-T G.709 bit-rate compliant information transparent transport of

    payload and preamble .................................................................................. 4 8 Characteristics of alternative mappings ..................................................................... 4

    8.1 ITU-T G.709 bit-rate compliant ................................................................... 6

    8.2 Inter-domain/intra-domain interfaces ........................................................... 6

    8.3 Timing and synchronization ........................................................................ 6

    8.4 Optical characteristics.................................................................................. 6

    8.5 Multiplexing, multi-service.......................................................................... 7

    8.6 Transparency ............................................................................................... 7

    8.7 BER monitoring .......................................................................................... 8 9 Multiplexing four ODU2e signals into ODU3e .......................................................... 9

    9.1 Asynchronous bit-transparent mapping of 4 x ODU2e signal

    into OPU3e1 ................................................................................................ 9

    9.2 Asynchronous generic mapping of four ODU2e signals into OPU3e2 .......... 17

     G series Supplement 43 (12/2008) iii

Supplement 43 to ITU-T G-series Recommendations

    Transport of IEEE 10GBASE-R in optical transport networks (OTN) 1 Scope

    This supplement describes different approaches for transport of 10GBASE-R signals in optical

    transport networks via an ODU2 or non-standard ODU2-like frame format (i.e., rates, formats and

    mappings that are not defined in ITU-T Recommendations). This supplement includes descriptions

    related to multiplexing the non-standard ODU2-like structures into ODU3-like signals. Different

    attributes of the varying solutions are described to help provide guidance on which approaches are

    appropriate to which network contexts.

    Including a currently non-standard mapping in this supplement does not preclude considering that

    mapping for standardization at a future date.

    2 References

    [ITU-T G.694.1] Recommendation ITU-T G.694.1 (2002), Spectral grids for WDM

    applications: DWDM frequency grid.

    [ITU-T G.696.1] Recommendation ITU-T G.696.1 (2005), Longitudinally compatible

    intra-domain DWDM applications.

    [ITU-T G.707] Recommendation ITU-T G.707/Y.1322 (2007), Network node interface for the

    synchronous digital hierarchy (SDH).

    [ITU-T G.709] Recommendation ITU-T G.709/Y.1331 (2003), Interfaces for the Optical

    Transport Network (OTN).

    [ITU-T G.798] Recommendation ITU-T G.798 (2006), Characteristics of optical transport

    network hierarchy equipment functional blocks.

    [ITU-T G.870] Recommendation ITU-T G.870/Y.1352 (2004), Terms and definitions for

    optical transport networks (OTN).

    [ITU-T G.872] Recommendation ITU-T G.872 (2001), Architecture of optical transport

    networks.

    [ITU-T G.959.1] Recommendation ITU-T G.959.1 (2006), Optical transport network physical

    layer interfaces.

    [ITU-T G.7041] Recommendation ITU-T G.7041/Y.1303 (2008), Generic framing procedure

    (GFP).

    [ITU-T G.8001] Recommendation ITU-T G.8001/Y.1354 (2006), Terms and definitions for

    Ethernet frames over Transport (EoT).

    [ITU-T G.8010] Recommendation ITU-T G.8010/Y.1306 (2004), Architecture of Ethernet

    layer networks.

    [ITU-T G.8012] Recommendation ITU-T G.8012/Y.1308 (2004), Ethernet UNI and Ethernet

    NNI.

    [ITU-T G.8251] Recommendation ITU-T G.8251 (2001), The control of jitter and wander

    within the optical transport network (OTN).

     G series Supplement 43 (12/2008) 1

    [IEEE 802.3] IEEE 802.3-2005, Information Technology Telecommunications and

    Information Exchange Between Systems LAN/MAN Specific Requirements

     Part 3: Carrier sense multiple access with collision detection (CSMA/CD)

    access method and physical layer specifications.

    

    3 Definitions

    None.

    4 Abbreviations and acronyms

    This supplement uses the following abbreviations and acronyms:

    CBR10G Constant Bit Rate signal of 9 953 280 kbit/s 20 ppm (see [ITU-T G.870]) CBR2G5 Constant Bit Rate signal of 2 488 320 kbit/s 20 ppm (see [ITU-T G.870]) FCS Frame Check Sequence

    FEC Forward Error Correction

    GFP Generic Framing Procedure

    GMP Generic Mapping Procedure

    IaDI Intra-Domain Interface (see [ITU-T G.870]) IPG Inter-Packet Gap

    IrDI Inter-Domain Interface (see [ITU-T G.870]) JC Justification Control

    JOH Justification Overhead

    MAC Media Access Control

    MFAS MultiFrame Alignment Signal

    MSI Multiplex Structure Identifier

    NJO Negative Justification Opportunity

    OCC Optical Channel Carrier with full functionality (see [ITU-T G.870])

    OCCr Optical Channel Carrier with reduced functionality (see [ITU-T G.870])

    ODU Optical Data Unit

    OH Overhead

    OPU Optical Payload Unit

    OTU Optical Transmission Unit

    PHY Physical layer

    PJO Positive Justification Opportunity

    PT Payload Type

    SDH Synchronous Digital Hierarchy

    SFD Start-of-Frame Delimiter

    SONET Synchronous Optical Network

    TS Tributary Slot

    2 G series Supplement 43 (12/2008)

TSOH Time Slot Overhead

    WAN Wide Area Network

    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 most significant bit (bit 1) is illustrated at the left in all the figures. 6 Standard mappings

    6.1 10GBASE-W (WAN PHY) via STM-64

    [IEEE 802.3] has defined a WAN interface for compatibility with SDH/SONET transport. In the Ethernet domain, this interface is supported via a WAN interface sub-layer (clause 50 of [IEEE 802.3]) that limits the effective data rate of the XGMII from 10 Gbit/s to 9.95328 Gbit/s prior to 64B/66B coding and insertion in an SDH/SONET format frame. The mapping of this data into the frame of an SDH STM-64 (VC-4-64c) is illustrated in Annex F of [ITU-T G.707]. Even if the interface provides only the 20 ppm clock accuracy required by clause 50 of

    [IEEE 802.3], rather than SDH clock tolerances (4.6 ppm), this can be transported via ODU2

    according to the mapping specified in clause 17.1.2 of [ITU-T G.709].

    6.2 GFP-F mapping of 10GBASE-R (LAN PHY) payload only into OPU2

    A payload information transparent mapping can be performed according to clause 7.3 of [ITU-T G.709] using the following process:

     Terminate (sink) the 64B/66B line code, preamble, SFD and IPG as per [IEEE 802.3]. Apply GFP-F framing.

     Encode into an OPU2 according to clause 7.3 of [ITU-T G.709].

    On the assumption that MAC frames do not on average exceed the maximum size specified by [IEEE 802.3] (1518 octets excluding the preamble, SFD and IPG), the bit rate required is for a signal that is +100 ppm from the nominal bit rate, approximately 9'922'968.791 kbit/s. If maximum size jumbo frames are used, the bit rate required for a signal that is +100 ppm from the nominal bit rate is approximately 9'995'002.399 kbit/s.

    Note that in the mapping of GFP frames into OPUk specified in clause 7.3 of [ITU-T G.709], the entire OPU2 payload area of 9'995'277 kbit/s is available (i.e., the fixed stuff bytes of the CBR10G mapping are not present). For an OPU2 that is running at the minimum rate of 20 ppm from the

    nominal value, this is reduced to 9'995'077.058 kbit/s.

    With standard IEEE 802.3 termination, this mapping can fully transport every ETH_CI traffic unit from a 10GBASE-R signal over an OPU2. Refer to Table V.4 of [ITU-T G.7041], where a characterization is given of the MAC rate throughput (not counting overhead) of 10GBASE-R signals versus GFP mappings. The MAC rate throughput of a 10GBASE-R interface, assuming a worst case situation of 9618-byte jumbo-frames is 9'986'502 bit/s. The MAC rate throughput of GFP mapping of the same MAC frames into ODU2 is 9'986'970 bit/s, which is greater than what is required to carry the entire MAC payload from a 10GBASE-R signal.

    7 Non-standard mappings

    This means rates, formats and mappings that are not fully defined in ITU-T Recommendations.

     G series Supplement 43 (12/2008) 3

7.1 Bit transparent mapping of 10GBASE-R signal into OPU2e

    This mapping has been moved to clause 17.1 of [ITU-T G.709].

    With this mapping, the resulting OTU-like OTU2e signal must be clocked at a nominal bit rate of 11.0957 Gbit/s, as opposed to the standard OTU2 nominal bit rate of 10.709225316 Gbit/s. 7.2 Bit transparent mapping of 10GBASE-R signal into OPU1e

    This mapping uses the mapping of CBR2G5 signal into OPU1, defined in clause 17.1.1 of [ITU-T G.709]. It has the same attributes as the clause 7.1 mapping above, but since the fixed stuff bytes of the CBR10G mapping are not left free, the overall data rate is somewhat less (11.0491 Gbit/s rather than 11.0957 Gbit/s). As with the clause 7.1 option, the clock tolerance of the underlying Ethernet signal (100 ppm) rather than that of a standard OTU2 signal (20 ppm),

    standard methods for control of jitter and wander according to [ITU-T G.8251] do not apply. A unique payload type (PT) shall be specified in payload structure identifier (PSI). For example, code "0x80" (reserved code for proprietary use per Table 15-8 of [ITU-T G.709] Payload type

    code points) is to be used.

    ?1?1?1Client payloadOTU1eODU1eOPU1e

    10.3558 Gbit/s11.0491 Gbit/s10.3125 Gbit/s(239/238 ?10.3125)(255/238 ?10.3125)(10GbE LAN PHY)

    GSup43(08)_F7-1

    Figure 7-1 Mapping structure without fixed stuffing

    Column

    Row17 814 1516 173824 38254080

    1FASOTUk OH

    2OPUk payloadOTUk FEC

    3OPUk OH

    4

    GSup43(08)_F7-2

    Figure 7-2 Mapping frame without fixed stuff bytes

    7.3 ITU-T G.709 bit-rate compliant information transparent transport of payload and

    preamble

    This mapping has been moved to clauses 17.3.1 and 7.3 of [ITU-T G.709] and clause 7.9 of [ITU-T G.7041].

    8 Characteristics of alternative mappings

    Table 8-1 provides a summary of the characteristics and applicability of each of the different mappings. Further discussion of each of these characteristics is provided in the indicated clauses.

4 G series Supplement 43 (12/2008)

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