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●Attenuation(衰减现象)信号能量在发送 至接收过程中的衰减。因为接收到的信 号能量会受到诸如线缆的电阻、距离以 及网络结构等因素的影响。一Backbone(网络干线)网络中用于承载网 络端点之间的通信的重要部分一CO(中心局)服务于特殊领域的电话公 司的设施。一条或多条电话
● Attenuation The attenuation of the signal energy during transmission to reception. Because the received signal energy is affected by factors such as cable resistance, distance, and network structure. A backbone in a Backbone network used to carry communication between network endpoints A CO (Central Office) serves the facilities of a particular area of the telephone company. One or more phones