Device and method for characterizing the transmission parameters of a transmission link for high bit rate data transmission

Method for determining the transmission parameters of a transmission link for high bit rate data transmission, where the transmission link comprises a line module (1) in a switching center, a modem (2) at a subscriber site, and a subscriber line (3) to connect between the line module (1) and the modem (2), and by which the following steps are carried out:

• the generation of first test signals by the line module (1) and the sending of these first test signals to the modem (2), with the first test signals being used to determine the transmission parameters of a transmission channel from the switching center to the subscriber,
• the receiving and analysis of the first test signals by the modem (2),
• the generation of second test signals by the modem (2) and the sending of these test signals to the line module (1), with the second test signals being used to determine the transmission parameters of a transmission channel from the subscriber to the switching center,
• the receiving and analysis of the second test signals by the line module (1),
• the generation of a test protocol by the modem (2) and the sending of this test protocol to the line module (1), with the test protocol containing an analysis of the first test signals, and
• the receiving and analysis of the test protocol by the line module (1).