Triple-Play Service Deployment

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Chapter 5: Troubleshooting the Premises Wiring
In poorly shielded or grounded coaxial network, time-of-day noise
floor variations can occur repetitively and are commonly linked to
increased activity in home networks. Figure 5.12 illustrates noise
floor variations at 17 MHz over a 72 hour period collected with a
performance logging spectrum analyzer. Figure 5.13 illustrates a
properly performing coax network at the same frequency over
same time period.
Figure 5.12 Average, max, min hold traces for a single frequency (17 MHz) over 72 hour time
period collected in 15 minute time increments
Figure 5.13 Average, max, and min hold traces for a single noise frequency (17 MHz) over 72
hour time period collected in 15 minute time intervals