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970Hz (BS5839-1:2002) O-O-O-O-O-O 18 110 45 2. 800Hz/970Hz @ 2Hz (BS5839-1:2002) O-O-O-O-O-I 1 110 44 3. 800Hz – 970Hz @ 1Hz (BS5839-1:2002) O-O-O-O-I-O 1 110 43 4. 970Hz 1s OFF/1s ON (Apollo Fire Systems Alert Tone, BS5839-1:2002) O-O-O-O- I - I 1 110 25 5. 970Hz, 0.5s/ 630Hz, 0.5s (Apollo Fire Systems Evacuate Tone, BS5839-1:2002) O-O-O-I-O-O 1 110 39 6. 554Hz, 0.1s/ 440Hz, 0.4s (France – AFNOR NF S 32 001 ) O-O-O- I -O- I 1 107 24 7. 500 – 1200Hz, 3.5s/ 0.5s OFF (Netherlands – NEN 2575:2000)