How do ADSL, CATV & “FTTH” fiber Internet access differ from ISDN?
ISDN allows you to have multiple phone/fax numbers, and make two calls simultaneously on the one line. Both ISDN & ADSL allow voice and data to share a phone line. It’s reported that even if your Internet usage is only 30 min./day, ADSL can work out cheaper than ISDN or analog: An analog line costs about ¥2,000/mo., and local calls are about ¥10 for 3 min. (providers charge typically ¥5 per min.) NTT’s 64kbps 24-hr. multi-provider FLet’s ISDN typically costs from (Yen) ¥2,520/mo. including unlimited Internet connect time (provider fee is from about ¥450/mo.) NTT 8 Mbps multi-provider FLet’s ADSL (including modem rental) is about ¥2,830/mo. plus provider charge of about ¥700/mo. and analog phone charge of about ¥2,000/mo.; 100 Mbps FTTH optical fiber service (shared in large condo.) is available from Usen at ¥4,800/mo. and from NTT (“B FLet’s”) from about ¥3,500/mo. (plus analog phone charge of about ¥2,000/mo. and provider charge of from about ¥700), and Cable is from about ¥2,500 to 5
