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3.21. Which of the following statements are correct about the “Point Coordination Function (PCF)” ?
下列哪些關於集中式協調功能(PCF)的敘述是正確的?
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| (a) The PCF provides contention free services. PCF 提供免競爭的傳輸服務 | |
| (b) Each station must one by one become the Point Coordinator (PC), which generates the Superframe. 每個工作站必須輪流成為中樞協調者(Point Coordinator, PC),負責產生超級訊框(Superframe) | |
| (c) Not all stations must be capable of becoming the PC and transmitting PCF data frames. 不是所有工作站都要有能力成為中樞協調者(PC) | |
| (d) The Superframe consists of a Contention Free period and a Contention Period. 超級訊框(Superframe)包含免競爭週期和競爭週期 | |
| (e) The length of a Superframe is a manageable parameter but that of the contention free period is fixed on a per Superframe basis. 超級訊框的長度是一個可調的參數,但每個超級訊框內的免競爭週期長度都必須一樣 |