单选题In SDH， what is the name of the embedded Data Communication Channel （DCC） in bytes D1-D3？（）A the DCC-EB the DCC-MC the DCC-RD the Line DCCE the Section DCC
单选题
In SDH， what is the name of the embedded Data Communication Channel （DCC） in bytes D1-D3？（）
A
the DCC-E
B
the DCC-M
C
the DCC-R
D
the Line DCC
E
the Section DCC
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