The decreasing of a transmitted signal as it travels along a cable.The longer the cable the more loss there will be.Above a certain amount of loss, the cabling may not transmit network data reliably.

• 当讯号由近端经由传输缆线传送讯号至远端,产生之讯号递减状态即称为衰减,缆线传输距离愈长则衰减值越大,最后则无法将讯号传输至远端。