The synchronization or asynchronism transmission may be selected with sundry modes. 数据传输包括同步传输和异步传输。
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. 为填满同步传输中空时间间隙或为满足在定长块传输中要求的字符计数而插入的一种字符。
