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劳驾,辛苦一下,帮我看看,原文在这
It implicitly derives the value of the link overhead based on the definition of the predefined link layer type because the encapsulation overhead is associated with the protocol. For example, in the case of a fixed length protocol data unit , the customer would also specify the unit size (e.g. ATM cellsize=53) and unit overhead amount (e.g. ATM header of 5 bytes).
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