Recommendation ITU-T G.709.6 (03/2024) Flexible OTN B400G long-reach interfaces
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
4 Abbreviations and acronyms
5 Conventions
6 Introduction and applications
7 Structure and processes
     7.1 FlexO-x(e)-DO-m signal structure
     7.2 Processing and information flow
8 FlexO frame
9 Overhead
     9.1 Frame alignment
10 FlexO mapping procedures
11 FlexO-x(e)-D
     11.1 FlexO-x(e)-D frame and multi-frame structures
     11.2 FlexO-x(e)-D Overhead
          11.2.1 Training sequence (TS)
          11.2.2 Pilot sequence (PS)
               11.2.2.1 8-bit block (k=8)
               11.2.2.2 4-bit block (k=4)
12 FlexO-x(e)-DO
     12.1 FlexO-x(e)-DO multi-frame structures
          12.1.1 Multi-frame structure
          12.1.2 Payload and FEC parity area
     12.2 FlexO-x(e)-DO bit rates and frame periods
     12.3 Overhead
          12.3.1 Multi-frame alignment signal (MFAS)
          12.3.2 Fixed stuff (FS)
     12.4 Mapping of FlexO-x(e) client into FlexO-x(e)-DO payload
          12.4.1 Padding
               12.4.1.1 CRC-32
                    12.4.1.1.1 CRC-32 Polynomial
                    12.4.1.1.2 CRC-32 error marking
               12.4.1.2 PAD
          12.4.2 OFEC block group (OFBG)
          12.4.3 OFBGkj scrambling
          12.4.4 OFBGkj structure representations
          12.4.5 Forward error correction
          12.4.6 Interleaving
               12.4.6.1 Intra-block interleaving
               12.4.6.2 Inter-block interleaving
          12.4.7 Block Merge of RIy into OFBGPkj and Mapping into FlexO-x(e)-DO
               12.4.7.1 Mapping of OFBGPkj (k = 8, j = 4) into FlexO-x(e)-DO (x = 8) (DP-16QAM symbols)
               12.4.7.2 Mapping of OFBGPkj (k = 4, j = 4) into FlexO-x(e)-DO (x = 4) (DP-QPSK symbols)
     12.5 FOICx(e).k-DO
          12.5.1 FOIC4(e).4-DO lanes
          12.5.2 FOIC8(e).8-DO lanes
Annex A  FlexO-x(e)-D TS, PS and MFAS overhead values
     A.1 FlexO-x(e)-DO TS, PS and MFAS overhead values
          A.1.1 Training sequence (TS)
          A.1.2 Pilot sequence (PS)
               A.1.2.1 8-bit block (k=8)
               A.1.2.2 4-bit block (k=4)
          A.1.3 Multi-frame alignment signal (MFAS)
Annex B  Test vectors