New transmission test set for exchange-type trunks

The increased use of carrier systems and 1-way dial circuits has increased the complexity of transmission testing. The introduction of direct-distance dialing has made the transmission maintenance requirements far more stringent. The instrument described here, designated as the Model TTS 6, was developed to cope with the increased complexity, to provide a high degree of accuracy, and to permit the use of labor-saving “1-man” test procedures.