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- [ Self Contained Payphones.]
- iNFERNO oF MED&eLTECH
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- The following is from an aging BT document on Payphone on-site maintenance,
- the document is fairly old to it may not be that relevant today..
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- CODE FUNCTION OF TEST
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- Operational Tones
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- 07 400 Hz Coin Tone
- 08 800 Hz Identification Tone
- 09 1200 Hz Identification Tone
- 10 400 Hz Warning Tone
- 11 400 Hz Coin Tone (Reciever short circuit)
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- MF 4 Tones
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- 12 679 Hz Reciever Short Circuit
- 13 770 Hz ``
- 14 852 Hz ``
- 15 941 Hz ``
- 16 1209 Hz ``
- 17 1336 Hz ``
- 18 1477 Hz ``
- 19 1633 Hz ``
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