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Reverse Path Troubleshooting: Evaluating TDMA Return Path Signals
105
5
viewing TDMA signals. This will allow the capture of the TDMA events for
analysis.
Zero Span mode shows a number of parameters from a TDMA signal,
including the power of the carrier, the noise floor, and interference. Fig. 5-5
shows the Zero Span display of a TDMA signal with an ideal noise floor. The
D marker shows the power of the TDMA desired signal. The U marker
shows the power of the undesired or noise floor. Very seldom are 56 dB
desired to undesired (D/U) ratios achieved.
Fig. 5-5 Time Domain Signal with No Ingress in Zero Span
A more realistic case is shown in Figure 5-6. This shows that the noise floor
is much higher than in Fig. 5-5. In this case the undesired signal has
increased in power from 43 to 30dBmV. This would represent a 45 dB
D/U.
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