In signaling tester mode, protocol software establishes a connection call with the mobile phone and performs radio characteristics tests (conforming to the 3GPP TC protocol).
In Tx/Rx tester mode, each of the following operations is carried out simultaneously without activating the protocol (no signaling): transmission of downlink Layer 1 signals to the mobile phone, reception of uplink signals from the mobile phone, and measurements of the transmitter characteristics of the mobile phone. You can perform a receiver characteristics test (Rx test) and a transmitter characteristics test (Tx test) on the mobile phone without signaling.
In Auto Test Mode, all tests are carried out automatically, requiring only minimal button operation on the mobile phone.