Triple-Play Service Deployment

Chapter 4: Troubleshooting the Copper Plant for IP Services
Finally, the spectral analysis measurement should support both
continuous and maximum hold (Max Hold) spectral graphing
functions. In the normal or continuous viewing mode, noise
values are plotted against frequency across the sampled bands,
allowing a near-real time continuous view. With the Max Hold
feature enabled, the maximum noise values detected over time
are plotted against frequency.This provides a real troubleshooting
benefit over snapshot graph views of noise amplitude vs.
frequency because noise level values are not static and typically
fluctuate over time. The Max Hold feature greatly enhances
analysis as opposed to the user trying to visually discern the
maximum values, in real time, across multiple frequencies.
Figure 4.8 Spectral analysis without Max Hold feature enabled and with Max Hold feature enabled
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