## 3 Evaluation of Melt Test Parameters and Analysis of DSL Service Provision
### Evaluation of MELT Test Parameters in the Mobile Application
The \"Collective Test\" option provides a more detailed output of the tested line parameters. In Figure 4, results for the selected port are displayed with a complete list of MELT test parameters. The upper part contains information about the test progress and the test line; the lower part involves the MELT tested line parameters appropriate for individual sections (RG, TR and TG) together with their classification. Subsequently, parameters--DC/AC foreign voltages and C capacity--are selected and used to evaluate the MELT test parameters and to analyze quantities. As examples, the following tables (Tables 2 and 3) present the test parameter values we received after execution of the MELT test procedure by means of the measuring Nokia test software on the real deployed homogeneous symmetric lines of the network operator. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **RG** & **TR** & **TG** \\ \hline DC [V] & \(-\)0.293 & \(-\)0.098 & \(-\)0.391 \\ \hline AC [Vrms] & 0.081 & 0.011 & 0.079 \\ \hline C [nF] & 66.400 & 40.200 & 66.900 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Measured values of the first tested line #1. Figure 4: Display of the test result with a complete list of MELT test parameters. Figure 3: Selection of the MELT option in the Nokia test software. From the above values, the mobile application can assume that the line on which the testing was conducted should be evaluated as overall satisfactory, but only some of the quantities are within the permitted tolerances. To verify the correctness, the mobile application is launched for verifying whether this assumption is correct. As can be seen in Figure 5, the WARNING message is displayed at the evaluated values of DC foreign voltages between all three sections, RG, TR and TG. Moreover, an unspecified class of foreign voltage levels has been identified as the possible cause of the failure, since all values of DC foreign voltages are below the specified range. Overall, the mobile application evaluated the first tested line with the PASS message. Based on the obtained output, we can confirm that the first tested line #1 is able to maintain DSL service provision without major restrictions. The second tested line #2 has the following parameters (Table 3). Figure 5: Evaluation of MELT test parameter values of the test line #1 in the mobile application. \begin{table}
\begin{tabular}{c c c c} \hline  & **RG** & **RT** & **TG** \\ \hline DC [V] & 0.187 & \(-\)0.070 & 0.200 \\ \hline AC [Vrms] & 0.107 & 0.012 & 0.109 \\ \hline C [nF] & 17.800 & 61.200 & 17.600 \\ \hline \end{tabular}
\end{table} 
Table 3: Measured values of the second tested line #2. After comparing the values with the reference values (Table 1), the mobile application can assume that the tested line should be evaluated by the PASS message. After loading the measured values into the mobile application, it can verify whether this assumption is correct. As can be seen in Figure 6, only the value of the DC foreign voltage between the Tip-Ring section was evaluated by the WARNING message. Overall, the second tested line was evaluated by the PASS message, which meets the assumption stated above, and the second line #2 is also suitable for DSL service provision without major restrictions.