Freedom R8100 SERIES, Operator'S Manual

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2.2.7.8 DPMR Test Mode
The R8100 dPMR Test Package option / dPMR Test Mode allows testing of radios compliant with the
dPMR radio transmission protocol. dPMR radios use a digital transmission format employing 4-Level
Frequency Shift Keying (4FSK) modulation in an RF spectrum managed by Frequency Division Multiple
Access (FDMA) technology. It only supports a 4800 bps transmission rate. The R8100 dPMR mode
provides a grouping of test functions compliant with the Conformance Test section of the dPMR Common
Air Interface (CAI) standard. These include power, Frequency Error, Symbol Deviation, Modulation
Fidelity (FSK Error), audio/test patterns, and Bit Error Rate (BER). BER tests require the manufacturer’s
Radio Service Software (RSS) to place the radio in a special test mode. In addition there is an Eye Diagram
with graphical representation of the dPMR signal and a Voice Loopback function that enables the Voice
Loop feature (U.S. patent 5703479) for audio verification of the radio’s end-to-end operation. Both
provide qualitative indication of the radio’s performance. Averaging can be applied to some
measurements by the System Settings. Figure 2.2.7.8-1 shows the R8100 main screen after choosing the
dPMR Test Mode in Monitor mode.
Figure 2.2.7.8-1. Main screen in Monitor mode after selecting dPMR Test Mode