Why K28.5 is more frequent to be used among the 12 control character in 8b/10b

Hi,

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There are other combinations that could do this but since K.28 has "111100", it's a little bit more limited

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what do you mean by above statement? could you explain further about it?

For my understanding,

k28.1 "1001111100" is also has a characteristic that k28.5 has just like what you explained right? Then may i know is there any difference?

Thanks and regards,

sysysy