The utility model relates to an adapter of being applied to communication equipment detecting system constitutes a whole by master control module (1), signal switching module (2), interface module (3) and special signal processing module (4) totally 4 parts. The utility model relates to a testing platform's replenishment, to equipment under test's communication system and characteristic, the test task that general test instrument can not accomplish has been accomplished to configuration special test resource. Cooperate the use with the platform that possesses general test instrument, improved the utilization efficiency of platform. Simultaneously, the adapter can be customized completely according to equipment under test, and it is easier to make communication equipment's automatic testing realization, is that the test system can not be compared in the past. Have reasonable in design, detect swiftly, use characteristics such as flexibility, reliable operation, simple to operate, easy operation.