ADSL Attack

摘要

Has T1 performance taken a turn for the worse? "Get your RBOC to check the loop," says technology consultant Steve Powell. And be sure to ask if ADSL services have been rolled out recently. Powell, who last year installed DSL circuits for Pacific Bell (San Francisco), claims that some competitive carriers are still deploying ADSL lines encoded with CAP (carrierless amplitude phase modulation). The CAP encoding scheme interferes with transmissions on other cables in the binder, causing bit errors on T1 and ISDN circuits that take a bite out of performance.