信号: signal; semaphore; gun单元: unit; unit element; cell; lo ...空信号单元: empty signal unit插入信号单元: fill-in signal unit初始信号单元: initial signal unit独立信号单元: alone signal unit (asu)多级信号单元: multilevel signal element多重信号单元: msu multiple signal unit复合信号单元: compound signal element后续信号单元: subsequent signal unit空闲信号单元: isu idle signal unit链路信号单元: link state signal unit起始信号单元: start signal element确认信号单元: acknowledgement signal unit填充信号单元: fill in signal unit fisu; fill-in signal unit停止信号单元: stop signal element同步信号单元: syu synchronization signal unit维护信号单元: msu maintenance signal unit消息信号单元: msu message signal unit信号单元定时: signal element timing信号单元格式: signal unit format信号单元故障: signal unit failure信号单元校准: signal unit alignment证实信号单元: acu acknowledgement signal unit终止信号单元: stosignal element
