Routine Line Measurements to Be Made on the Line Repeaters of Audio-Frequency Sections or Circuits - General Maintenance Principles - Maintenance of International Transmission Systems and Telephone Circuits (Study Group IV) 2 pp
Certain of the tests in this Recommendation may conveniently be carried out on an in-station (or in-circuit) basis using measuring equipment to the specification in Recommendation 0.25 [i]. This equipment will not provide reliable test results for a circu