A detectable impulse(voltage, current, magnetic field, or light impulse) by which information is com municated through an electronic or optical means, or over wire, cable, microwave, or laser beams.

• 一种可检测的脉冲（电压、电流、磁场或光脉冲），用以通过电或光纤设备，或经过电线、电缆、微波或激光束进行信息通信。