单选题Scrambling of SONET signals is done to （）.Aprevent the leakage of external fiber emissionsBprovide the optical network with the highest level of security possibleCassure an even distribution of 1's and 0's for extended transmitter lifeDassure an adequate number of transitions for clock recovery at the receiverEprevent the receiver from assuming AIS inadvertently when all 0's are received
单选题
Scrambling of SONET signals is done to （）.
A
prevent the leakage of external fiber emissions
B
provide the optical network with the highest level of security possible
C
assure an even distribution of 1's and 0's for extended transmitter life
D
assure an adequate number of transitions for clock recovery at the receiver
E
prevent the receiver from assuming AIS inadvertently when all 0's are received
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