In order to achieve the specified synchronization quality requirements, corresponding requirements must be made for the synchronous transmission network, and certain networking rules must be followed during network planning. Which of the following is wrong?

In order to achieve the specified synchronization quality requirements, corresponding requirements must be made for the synchronous transmission network, and certain networking rules must be followed during network planning. Which of the following is wrong?
A . In one clock transmission direction, the number of stations between transit office clocks cannot exceed 30.
B . The number of switching station clocks cannot exceed 10
C . The total number of devices in one direction cannot exceed 60

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Answer: A