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

[FPGAs]

meaning and profile of doh

please tell me the details.

thanks a lot!

 

[SFactor]

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

 

[FPGAs]

toh sonet

thank you very much!

 

[shahhoseini_amir]

toh means

Good Doc About Sonet

 

[straw]

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

 

[mamerm77]

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