Digital Subscriber line (HDSL and ADSL) Capacity
The fundamental limits of the outside loop plant to carry high-speed digital (bidirectional HDSL and ADSL) data are reported in this Chapter. This Chapter also focuses on the copper wire-pairs, drop lengths, and interconnects that convey the data over the “last mile” to almost all businesses and residences in the United States. The two major customers, businesses and households are classified, characterized, and categorized by the distance to the Central Office or the remote terminal. Their spectral capabilities are computed and their ultimate digital capabilities are reported. The crosstalk limitations inherent in the plant are also computed and verified against the loss of signal due to distance and spectral constraints. The signal-to-noise ratio can thus be estimated to ascertain the transmission quality through the plant. Accordingly, this Chapter reports losses, bandwidths, and bit rates in the first half, and major bottlenecks and their implication in the second half.
KeywordsLoop Length Cable Length Digital Subscriber Line Bell System Technical Journal Loop Topology
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