...聚子层转换二协议（将 Ethernet 的traffic 转换成FDDI 的4B/5B--它被用于仿真Ethernet 的载波检测、传输 和idle signal(空闲信号)。 Fig.5-7 2） 4T+（需新的信令） 2.
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有许多出纳窗口的银行经常使用电子信号来指示下一个空闲出纳员的位置。
A bank with many teller Windows often USES electronic signs to indicate the location of the next free teller.
李女士用另一只空闲的手，几经周折终于取出了手机，然而没有信号。
With her free hand, Ms. Li managed to fumble it out, but there was no signal.
FCC的决定受到多家电视台的反对(PDF版的请愿书)，他们担心空闲频道的使用可能会干扰电视信号以及使用了相同波段的在线歌手。
FCC's decision was contested by the TV broadcasters (Petition as PDF) who fear using the freed channels would interfered with TV signals and live singers who are using the same wave Spaces.
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