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BS 8521:2009
M00000142
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BS 8521:2009 Specification for dual-tone multi-frequency (DTMF) signalling protocol for social alarm systems
standard by BSI Group, 04/30/2009
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Cross References:
BS EN 50134-1
BS EN 50134-3
ES 201 235-1
ES 201 235-2
ES 201 235-4
ITU-T Recommendation G.711:1988
All current amendments available at time of purchase are included with the purchase of this document.