Rec. ITU-T G.7041/Y.1303 (08/2016) iii
Table of Contents
Page
1 Scope ............................................................................................................................. 1
2 References ..................................................................................................................... 1
3 Terms and definitions ................................................................................................... 3
4 Abbreviations and acronyms ........................................................................................ 4
5 Conventions .................................................................................................................. 6
6 Aspects common to both frame-mapped and transparent-mapped modes of GFP ...... 6
6.1 Basic signal structure for GFP client frames .................................................. 7
6.2 GFP control frames ......................................................................................... 18
6.3 GFP frame-level functions ............................................................................. 19
6.4 Management communications frame ............................................................. 24
7 Payload-specific aspects for frame-mapped GFP ......................................................... 24
7.1 Ethernet media access control payload ........................................................... 24
7.2 HDLC/PPP payload ........................................................................................ 27
7.3 Fibre channel payload via FC-BBW_SONET ............................................... 28
7.4 Error handling in frame-mapped GFP ............................................................ 29
7.5 IEEE 802.17 resilient packet ring payload ..................................................... 29
7.6 Direct mapping of multiprotocol label switching into GFP-F frames ............ 30
7.7 Direct mapping of IP and OSI network layer PDUs into GFP-F frames ....... 31
7.8 DVB ASI payload ........................................................................................... 32
7.9 Transporting Ethernet 10GBASE-R payloads with preamble transparency
and ordered set information ............................................................................ 33
7.10 Precision time protocol ................................................................................... 36
7.11 Synchronization status messages .................................................................... 37
8 Payload-specific aspects for transparent mapping of 8B/10B clients into GFP ........... 38
8.1 Common aspects of GFP-T ............................................................................ 38
8.2 Running disparity in 64B/65B codes .............................................................. 42
8.3 Client-specific signal fail aspects ................................................................... 44
8.4 Synchronous full-rate transparent mapping of 8B/10B clients into GFP ....... 47
8.5 Asynchronous (full- or sub-rate) mapping of 8B/10B clients into GFP ........ 50
Appendix I – Examples of functional models for GFP applications ....................................... 51
Appendix II – Sample GFP payload types ............................................................................... 53
Appendix III – GFP frame example illustrating transmission order and CRC calculation ..... 54
III.1 Worked example for a GFP-F frame .............................................................. 54
III.2 Worked example for a GFP-T superblock CRC calculation .......................... 57
III.3 Worked example for a GFP-F encapsulated MPLS frame ............................. 57
