Freedom R8100 SERIES, Operator'S Manual

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Figure 3.2.8.5-3 P25 Trunk submenu after starting BER test after registration
Modulation Mode (P25 Trunk BER submenu)
A horizontal submenu provides choice of Off or Continuous mode for the selected Test Pattern
modulation.
Test Pattern (P25 Trunk BER submenu)
Provides selection for one of 4 TIA/EIA-102.CAAA compliant predefined test patterns (as shown in
Figure 3.2.8.4.1-4) for BER testing of a P25 radio in transmit or receive mode. Use BER Test to enable
transmitter testing and Modulation Mode to control receiver testing. The following patterns are available:
1011 Hz Tone – The standard tone framed test pattern of the 1011 Hz vocoder tone.
Calibration (Tone 5%) – The test pattern derived from the standard 1011 Hz Tone test pattern to verify
BER measurements are operating correctly. Every 20th bit is inverted to yield 172 errors out of 3456 bits
resulting in a 4.976852% BER.
Standard Tx (O.153/V.52) – The standard transmitter test pattern of continuously repeating 511-bit pseudo
random number sequences based on ITU-T O.153 (formerly CCITT V.52).