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What is E1 & How can relate with SDH or PDH ?
Answer:

E1 is European digital transmission format , this name is given by CEPT (Conference of European Postal and Telecommunication administration)

E1 having 32 Channel with 64 Kbps data rate.

E1=32*64=2.048 Mbps

PDH=17E1

SDH=63E1=155Mbps this also known as STM1


STM1 is Synchronous Transport Module level-1



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