GAI-Tronics ITR1000-001 Model ITR1000-001 Basic Tone Remote Deskset with Line Select User and Installation Manual - Manual (Page 22)

Installation ITR1000-001 Basic Tone Remote Desk Set
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High Level Guard Tone Durations
F1 F2 F3 F4 Duration
Off Off Off Off 120 ms
Off Off Off On 200 ms
Off Off On Off 300 ms
Off Off On On 400 ms
Off On Off Off 500 ms
Function Tone Durations
F1 F2 F3 F4 Duration
Off Off Off Off 40 ms
Off Off Off On 50 ms
Off Off On Off 60 ms
Off Off On On 70 ms
Off On Off Off 80 ms