Which of the following statements about clock sources is incorrect?

• A.Internal clock sources have the lowest priority because of their low precision.
• B.Generally, tributary clocks are not used as the clock sources of devices.
• C.The same SSM protocol is selected for all NEs in a clock protection subnet.
• D.If the standard SSM protocol is enabled, you need to set the clock source ID.

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When the SXCS board is configured for an OSN 3500, which of the following is the access capacity of the subrack in full configuration?

• A.155G
• B.58.75G
• C.35G
• D.80G

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During service configuration, there are two timeslot modes. Huawei uses the interleaved timeslot mode by default.

• A.FALSE
• B.TRUE

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