信号: signal; semaphore; gun单元: unit; unit element; cell; lo ...指示: indicate; point out instruct符: tally symbol; mark二元指示符: dyadic indicant一元指示符: monadic indicant空信号单元: empty signal unit信号单元: signal element; signaling unit; su signal unit一元指示符, 单向指示符: monadic indicant数字变元指示符: numeric argument indicator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
