The experimental telephone's ring is activated by pulses sent through a glass fiber . 這種實驗性電話鈴是依靠玻璃纖維所傳送的脈沖激發(fā)而工作的。
Low - level code handles the actual signals , such as the generation of electrical pulses sent over an ethernet cable or through a telephone modem 低階程式碼負責(zé)操縱真實訊號,比如產(chǎn)生電脈沖,并把訊號傳送到乙太網(wǎng)路的纜線或電話數(shù)據(jù)機。