Jìshù / rényuán / zhèngzài / cèshì / jīchǔ / sùlǜ / jiēkǒu / shìfǒu / yùnxíng / zhèngcháng。技术人员正在测试基础速率接口是否运行正常。The technicians are testing whether the basic-rate interface is working properly.