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hi all. i am working on developing 100G Ethernet PCS based on IEEE std.802.3bj-2014.
i am confused about the scrambler and 256B/257B transoder.
the tx flow described in IEEE 802.3bj-2010 standard is below:
Encode -> Scramble -> Block Distribution -> Alignment Insertion
-> Lane block sync -> Alignment block removal -> Transode -> Alignment insertion -> Reed-Solomon encoder -> symbol distribution
HERE COMES THE QUESTION:
the Transcode compresses data based on the un-scrambled 66B-block, but the flow shows me that the data has already been scrambled before Transcode. since transcoding process cannot apply to the scrambled data, am i miss something? should i add a descrambler before Transcode and add a scrambler after Transcode or RS encoder ?
somebody help me, plz
i am confused about the scrambler and 256B/257B transoder.
the tx flow described in IEEE 802.3bj-2010 standard is below:
Encode -> Scramble -> Block Distribution -> Alignment Insertion
-> Lane block sync -> Alignment block removal -> Transode -> Alignment insertion -> Reed-Solomon encoder -> symbol distribution
HERE COMES THE QUESTION:
the Transcode compresses data based on the un-scrambled 66B-block, but the flow shows me that the data has already been scrambled before Transcode. since transcoding process cannot apply to the scrambled data, am i miss something? should i add a descrambler before Transcode and add a scrambler after Transcode or RS encoder ?
somebody help me, plz
