Design and Implementation of DSL-Based Access Solutions

SDSL

SDSL is symmetric in nature, which in simple language means you get the same bandwidth in both upstream and downstream direction. With SDSL, the maximum bandwidth that can be achieved is 2.3 Mbps. The typical maximum reach for SDSL is approximately 4 km, or 12,000 feet.

SDSL, like IDSL, makes use of 2B1Q encoding. SDSL, however, is not repeatable, meaning that you cannot connect repeaters to boost the signal. The inability to use repeaters with SDSL results in the same distance limitation approach as that of ADSL. SDSL, unlike ADSL, is not rate adaptive, implying that once the two modems are trained up they will not rate adapt to a lower rate in case of noise interference or other factors.

SDSL because of its symmetric nature becomes an ...