| 摘要 |
PURPOSE: A performance test apparatus in the WLL(Wireless Local Loop) system is provided to carry out the self-performance tests of a base station and a radio interface unit. CONSTITUTION: A duplexer(242) is coupled to a wireless connection terminal(241) to connect for a radio interface unit by wireless. By the output of the duplexer(242), a first distributor(243) is coupled through a first variable attenuator(ATT1). By the input of the duplexer(242), the on terminal of a fourth switching unit(SW4) is connected through a second variable attenuator(ATT2). The first output of the first distributor(243) is connected with the on terminal of a first switching unit(SW1). The second output of the first distributor(243) is connected with the on terminal of a second switching unit(SW2). The first switching unit(SW1) is connected with the on terminal of a third switching unit(SW3). The off terminal of the first switching unit(SW1) is connected to a mixer(246) through a band pass filter(245). |
