Error performance objectives of the hypothetical reference digital path for radio-relay systems providing connections at a bit rate below the primary rate and forming part or all of the high grade portion of an integrated services digital network
无线中继系统假设参考数字路径的误码性能目标以低于主速率的比特率提供连接 并构成综合业务数字网络高等级部分的一部分或全部