The synchronization or asynchronism transmission may be selected with sundry modes. 數據傳輸包括同步傳輸和異步傳輸。
A character inserted to fill a blank time slot in synchronous transmission, or inserted to fulfill a character-count requirement in transmissi ons of fixed block lengths. 為填滿同步傳輸中空時間間隙或為滿足在定長塊傳輸中要求的字符計數而插入的一種字符。