| 摘要 |
A device and method are described for providing test access for checking a transmission line carrying at least a plurality of digital channels, the transmission line having a plurality of twisted pairs, the device being for use with a test head for determining a quality of the transmission line. A connection matrix is provided for switching one of a plurality of the twisted pairs to a test bus, and a high pass filter is coupled for maintenance of the digital channels, wherein the high pass filter is located in the connection matrix. An advantage of the invention is that network devices that need channel equalization such as xDSL modems, do not have to resynchronize when the test access for testing in a low frequency band (DC test or voice frequency path tests) is switched on. |
