Communication test set with a graphical user interface that can simultaneously present and update test results of a communication signal at multiple levels

In a communication test device, a method of displaying test results of a first communication line, comprising:

• displaying in a first screen test results of a first communication format of a first communication line being tested, the first communication line containing:
• a second communication format multiplexed into the first communication format and having a lower speed than the first communication format,
• a third communication format multiplexed into the second communication format and having a lower speed than the second communication format, and
• a fourth communication format multiplexed into the third communication format and having a lower speed than the third communication format;
• displaying in a second screen test results of the second communication format contained in the first communication line;
• displaying in a third screen test results of the third communication format contained in the first communication line;
• displaying in a fourth screen test results of the fourth communication format contained in the first communication line;
• wherein the first, second, third and fourth screens are simultaneously displayed.