| 摘要 |
A PBX (Private Branch Exchange) module is disclosed to include an OFDM carrier module, a voltage isolation unit electrically connected to the OFDM carrier module for isolating voltage to let signal pass, a high-pass filter unit formed of a plurality of high-pass filter circuits electrically connected to the voltage isolation unit each having a predetermined high-pass filter value for allowing a high frequency signal over the predetermined high-pass filter value to pass and a connector connected to a respective telephone set, and a low-pass filter unit formed of a plurality of low-pass filter circuits electrically connected to the high-pass filter circuit each having a predetermined low-pass filter value for allowing a low frequency signal below the predetermined low-pass filter value to pass and a connector connected to a private branch exchanger.
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