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BS 8521:2009
Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems
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Summary
Messages;Control functions;Alarm systems;Information transfer;Telephone signalling equipment;Acoustic signals;Warning devices;Digital signals;Data transmission;Special-purpose alarms;Codes;Telephone networks
Technical characteristics
| Publisher | British Standards Institution (BSI) |
| Publication Date | 04/30/2009 |
| Page Count | 30 |
| Themes | Telephone networks |
| EAN | --- |
| ISBN | --- |
| Weight (in grams) | --- |
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30/04/2009
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