Question: Select the correct statement ( s ) regarding SONET and SDH . a . STS describes the SONET electrical signal, while STM describes the SDH

Select the correct statement(s) regarding SONET and SDH.
a. STS describes the SONET electrical signal, while STM describes the SDH electrical signal
b. OC describes the optical signal on both SONET and SDH
c. An STS-3 equals an STM-1, which is 155.52 Mbps
d. All of the above are correct

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