ocr: dB 12 9 8 6 - 3 *) 0 2 0 300 500 800 1000 2000 2500 2800 3000 Hz Frequency CCITT-37043 Alternative Recommended Frequency band with defined characteristics for Signalling System No. 6. Note - Below 300 Hz and above 3000 Hz the loss shall not be less than 0.0 dB but is otherwise unspecificd. FIGURE 15 Limits for overall loss of the transfer link relative to that at reference frequency (Alternative if tests confirm suitability)
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