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MSUs are the only signal units that are retransmitted if they are received in error.
MSU是信令接收出错时仅传输的信令单元.
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FISUs carry no user data, but can be used to maintain link integrity and acknowledge MSUs.
FISU不传送任何用户数据, 而是用于维护链路的完整性和确认MSU的.
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