A7 The spread of digital subscriber line (DSL), including ADSL, services was relatively fast. Expansion was quick as the technology could be used on existing telephone networks. The overall broad-band penetration among OECD countries is 16.9%, with DSL representing 1 0.5%, broadband that utilizes CATV networks 4.9%, and the rest 1.4%. In Japan, DSL has a penetration rate of 11.1 o/o, cable TV of 2.8%, and the rest, which consists mostly of fiber-optic cable, 6.2%. According to the OECD, Japan has 7.9 million subscribers to fiber-optic services, the highest number among OECD members. The fiber-optic cable penetration rate for households in Japan is No. 1 in the world.