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【名称】：Generic framing procedure (GFP)
【作者】：ITU-T
【格式】: PDF
【页数】：52
【语言】：英文
【摘要或目录】：
1 Scope............................................................................................................................ 1
2 References.................................................................................................................... 1
3 Terms and definitions................................................................................................... 2
4 Abbreviations............................................................................................................... 2
5 Conventions.................................................................................................................. 4
6 Common aspects of GFP.............................................................................................. 4
6.1 Basic signal structure for GFP client frames.................................................. 5
6.1.1 GFP Core Header........................................................................................... 6
6.1.2 GFP Payload Area.......................................................................................... 7
6.1.3 GFP client frames........................................................................................... 13
6.2 GFP Control frames....................................................................................... 15
6.2.1 GFP Idle frames............................................................................................. 15
6.2.2 Other control frames....................................................................................... 15
6.3 GFP frame-level functions............................................................................. 15
6.3.1 GFP frame delineation algorithm................................................................... 16
6.3.2 Frame multiplexing........................................................................................ 17
6.3.3 Client Signal Fail indication........................................................................... 18
6.3.4 Defect handling in GFP.................................................................................. 18
7 Payload specific aspects for frame-mapped GFP......................................................... 19
7.1 Ethernet MAC payload................................................................................... 19
7.1.1 Ethernet MAC encapsulation......................................................................... 19
7.1.2 Ethernet Inter-Packet Gap (IPG) deletion and restoring................................ 19
7.2 IP/PPP payload............................................................................................... 20
7.2.1 PPP frame encapsulation................................................................................ 20
7.2.2 GFP/HDLC delineation interworking............................................................ 20
7.2.3 PPP payload configuration options................................................................ 21
7.3 Error handling in frame-mapped GFP............................................................ 21
8 Payload-specific aspects for transparent mapping of 8B/10B clients into GFP........... 21
8.1 Adapting 8B/10B client signals via 64B/65B block codes............................ 22
8.1.1 10B_ERR code............................................................................................... 24
8.1.2 Insertion of 65B_PAD code and GFP Client Management frames............... 25
8.2 Adapting 64B/65B code blocks into GFP...................................................... 25
8.2.1 Error control with Transparent GFP............................................................... 26
8.3 Running disparity in 64B/65B codes............................................................. 26
8.3.1 Handling of running disparity on ingress....................................................... 27
ITU-T Rec. G.7041/Y.1303 (12/2001) iii
Page
8.3.2 Handling of running disparity on egress........................................................ 27
8.3.3 Client-specific running disparity aspects....................................................... 27
8.4 Rate adaptation in 64B/65B codes................................................................. 28
8.4.1 Egress rate adaptation procedures.................................................................. 29
8.4.2 Client-specific rate adaptation aspects........................................................... 30
8.5 Client-specific Signal Fail aspects................................................................. 31
8.5.1 Fibre Channel payload................................................................................... 32
8.5.2 ESCON Payload............................................................................................. 32
8.5.3 FICON Payload.............................................................................................. 33
8.5.4 Full-duplex Gigabit Ethernet payload............................................................ 33
Appendix I - Examples of functional models for GFP applications....................................... 33
Appendix II - Sample GFP payload types.............................................................................. 36
Appendix III - GFP frame example illustrating transmission order and CRC calculation..... 37
Appendix IV - Number of superblocks used in Transparent GFP.......................................... 40
