Test equipment for routine testing of individual items of equipment such as circuit equipment, connecting circuits, registers, etc., should be provided in every international exchange. Routine tests should be made in accordance with the practice followed
ITU-T Q.327-1989 history
1989ITU-T Q.327-1989 Testing Arrangements- General Arrangements - Specifications of Signalling Systems R1 and R2 (Study Group XI) 1 pp