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what is the meaning of toh and doh in SDH/SONET?

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FPGAs

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meaning and profile of doh

please tell me the details.

thanks a lot! :)
 

SFactor

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doh - meaning and profile

TOH means transport overhead which is the overheads added to the payload
i think there are nothing called doh in the SDH but i think you mean POH which means path overhead
 

straw

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toh include soh and poh,soh is segment overhead(such a1 a2,b1 ,b2,),poh is path overhead(such j1 h4)
 

mamerm77

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yes it is correct the TOH and POH exists in the SDH but there is no DOH
 

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