THEORETICAL AND PRACTICAL LIMITS OF TRANSMISSION CHANNELS USED BY THE ADSL TECHNOLOGY IN THE METALLIC LINE'S ENVIRONMENT IN THE ACCESS NETWORK IN SLOVAKIA

Rastislav Róka

   For successful expansion of new multimedia services through xDSL technologies in the access network in Slovakia, it is necessary exactly to know miscellaneous features of real environments and particular transmission characteristics of homogeneous symmetric lines. To evaluate the transmission channel limits, it is also unavoidable to know environmental noise characteristics because of their negative influences on the transmitted information signals. This article comprehensively discusses two qualitative parameters of metallic homogeneous lines - the channel capacity and the cut-off rate. Also, the bandwidth efficiency is presented as a function of the signal-to-noise ratio for both parameters.

Keywords: channel capacity, cutoff rate, bandwidth efficiency

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