发信: post a letter; send transmit ...信号: signal; semaphore; gun单元: unit; unit element; cell; lo ...定时: timing; at regular time; fix ...发信信号单元定时电路: send signal element timing circuit信号单元定时: signal element timing发送信号单元定时: transmitter signal element timing; transmitting signal element timing接收信号单元定时: rset receive signal element timing空信号单元: empty signal unit信号单元: signal element; signaling unit; su 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
