###### Abstract
Additionally, a Per-Tone Equalizer (PTEQ) is an attractive alternative for dealing with extended loop lengths [27]. For mitigation of the electromagnetic coupling between wires in a cable binder, DSL systems use multi-channel processing for providing high data rates to multiple users [28]. Like any communication system, the performance of DSL systems is limited by several types of failures [29; 30]. The effect of thermal noise in communication systems cannot be completely avoided and sets an upper limit to communication power, which is known as channel capacity. Reaching channel capacity requires the implementation of powerful error-fixing codes. Older DSL systems use relatively simple Reed-Solomon (RS) codes as outer code and the Trellis Code Modulation (TCM) as internal code, with a translator between them. As can be seen, information about the exact state of the metallic transmission medium--homogeneous symmetric lines--is especially important for many reasons: solving the interference problem with other metallic access technologies, designing advanced signal processing techniques, also including modulation and encoding, and preparing and realizing appropriate simulation models of metallic transmission media for subsequent application. Therefore, fast, and precise measurements on homogeneous symmetric lines are still essential, meaningful and imperative. In addition, the goal of eliminating adverse effects is not only to move the DSLAM device closer to the customer, but also to correctly detect failures and inaccuracies. That is why tests on metallic transmission media are deployed in access networks as well. If a fault occurs in the line or the customer achieves an inadequate quality of the service provided, he calls customer service and line testing is conducted. Methods for integrating the DSL automated test, data from network elements, analyses and DSL operations are described in [31]. Automated maintenance routines can isolate faults in flowthrough testing, automatically issuing trouble tickets toward the correct work center. New triple-play services have high customer expectations with demanding reliability requirements that can be ensured with an integrated test. We distinguish between testing on the customer side and without the need for measurement on the customer side. The first group includes the Double Ended Line Testing (DELT) test, where the echo of the signal is measured, and for this reason the measurement is conducted on the customer side. The second group includes Metallic Ended Line Testing (MELT) and Single Ended Line Testing (SELT), which allow faults to be detected and localized on the transmission line. In our contribution, we are focusing on the importance of measurements on homogeneous symmetric lines, on the realization of a mobile application for facilitating the jobs of technicians and on the evaluation of test parameter values and analysis of homogeneous symmetric lines for DSL service provision. While other test techniques focus on testing network throughput and provided quality of services, our proposed technique focuses on the testing of homogeneous symmetric lines' parameters. This test technique allows for not only solving the failure causes of homogeneous symmetric lines themselves, but also the provided services. In this case, the test technique based on diagnostics of homogeneous symmetric lines can solve the reduced quality causes of provided services, which is an advantage over other test techniques such as the DSL Quality Management (DQM) loop principle. The MELT test allows measuring on a metallic transmission medium without the need for the presence of a customer-side connection. Unlike with other types of tests, it is possible to accurately detect and localize the failure. Therefore, this type of test is the best for analyzing real homogeneous symmetric lines. The limitation of the MELT technique application is represented by the excessive traffic load on the metallic access network if it would be deployed automatically.