Learn in the textbookMobile Wide-Area Communication and Transmission Performance
DefinitionTransmission speed (伝送速度) measures how fast a line communicates by the amount of data it can send per second, using the unit bps.
ExplanationThe time to finish sending data is found as data size ÷ transmission speed. On a real line, overhead such as control information keeps the speed below its rated value, so you multiply by the usable share, the transmission efficiency (伝送効率), and calculate with the resulting effective speed (実効速度).
AnalogyLike the amount of water a pipe can carry each second. The wider the pipe, the sooner the same amount of water gets through.
Memory hookSame shape as distance = speed × time: data size = transmission speed × time. To find the time, divide.