CHAPTER 5 ADJUSTMENT5.15.1.15.1.25.1.35.1.45.1.55.1.65.2 Optical Adjustment ....................................... 5 - 125.2.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 1 25.2.2 Setting-up for Adjustment. ................................ 5 - 155.2.3 Measurements/Adjustments ............................... 5- 16Electrical Adjustments .................................... 5- 1Ringing Signal Detection Sensitivity ........................ 5 - 1Dial Tone and Busy Tone Detection Level (1) ................ 5- 3Dial Tone and Busy Tone Detection Level (2) ................ 5 - 5NAK Tone Detection ..................................... 5 - 7BuzzerSound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 9Near End (Black-Belt) Detection ............................ 5 - 10
