Availability objectives for a hypothetical reference digital path when used for the transmission of B-ISDN asynchronous transfer mode in the fixed-satellite service by geostationary orbit satellite systems using frequencies below 15 GHz
当地球静止轨道卫星系统使用低于15 GHz的频率在固定卫星服务中传输B-ISDN异步传输模式时 假设参考数字路径的可用性目标