Residential Broadband, Second Edition

Technical Challenges to xDSL

As discussed earlier in the section "Benefits and Business Rationale of DLC," telcos have a number of compelling business reasons to pursue xDSL. The benefit to the customer is faster service than POTS or ISDN. But although the general architecture of DSL service for POTS and ISDN is well known, using the same infrastructure for high-speed services presents new technical problems.

Loop Qualification

The ideal local loop has no loading coils , no changes in wire gauge, and no bridged taps; is well insulated; and is as short as possible. Reality is different. End-to-end performance of the local loop is impacted by loop length, loading coils, quality of end-to-end splicing of wiring segments, multiple changes of ...