日本电报电话公司(NTT)已向邮电部提出申请,要求批准它开始经营基本速率的ISDN业务,其名称为INS-Net 64。这项申请一旦获准,将首先在东京、名古屋和大阪开放该业务,其它大城市将在1989年开放。然后再根据市场需求进一步扩大范围。所提出的资费包括三 Japan National Telegraph and Telephone Corporation (NTT) has submitted an application to the Ministry of Posts and Telecommunications for approval to start its operation as a basic rate ISDN business under the name INS-Net 64. Once the application is approved, the business will be opened in Tokyo, Nagoya and Osaka first, and other major cities will open in 1989. Then according to market demand to further expand the scope. The proposed tariffs include three