256b/257b Transcoding for 100 Gb/s Backplane and Copper Cable

7

IBM

Data Blocks and Control Blocks

256b/257b transcoding converts four incoming 66-bit blocks into one 257-bit block

Four incoming 66-bit blocks that have to be transcoded may be data blocks (DB) with

Data block #i with 64-bit block payload DBi(64) where bits are sent from left to right

CBj(56) where bits are sent from left to right

DBi(64)

CBj(56)