The operating band of an individual antenna covers e. g. the frequency range used by a radio system or only the transmitting or receivingband in that range.
单个天线的工作频带覆盖了例如由无线电系统所使用的频率范围或者只是该频率范围内的发射频带或接收频带。
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In the case of receiving out-of-band data, the protocol layer checks for different conditions to validate that the received data is OOB, and then returns it to the socket layer.