美利体育登录入口官网:ITU-R F.696-2-1997
低于基群速率利用数字无线中继系统形成部分或全部ISDN连接中段的假设参考数字段的误码性能和可用性目标
Error Performance and Availability Objectives for Hypothetical Reference Digital Sections Forming Part or All of the Medium-Grade Portion of an Integrated Services Digital Network Connection at a Bit Rate Below the Primary Rate Utilizing Digital Radio-Rel