Practises in Telephone Transmission Maintenance Work

This paper describes the practical applicationis of transmission maintenance methods in a telephone system. The methods applicable to toll circuits of various types are first discussed, irfcrmation being included in this connection on the maintenance of the amplifier circuits involved in telephone repeaters and carrier. Testing methods applicable to the local or exchange area plant are next described, the description including both manual and machine switching systems. The results accomplished in toll and local transmission maintenance work are considered from the standpoint of the kinds of troutbles which can be eliminated and the effect which these troubles have on service. The methods described in the main body of the paper relate particularly to tests of volume efficiency. Certain other transmission maintenance testing methods directly associated with volume efficiency tests are briefly described in Appendix A of the paper.