ES 201 235-4 : 1.3.1
Current
The latest, up-to-date edition.
ACCESS AND TERMINALS (AT); SPECIFICATION OF DUAL-TONE MULTI-FREQUENCY (DTMF) TRANSMITTERS AND RECEIVERS; PART 4: TRANSMITTERS AND RECEIVERS FOR USE IN TERMINAL EQUIPMENT FOR END-TO-END SIGNALLING
Hardcopy , PDF
English
Intellectual Property Rights
Foreword
1 Scope
2 References
3 Definitions, symbols and abbreviations
3.1 Definitions
3.2 Symbols
3.3 Abbreviations
4 The receiver
4.1 Area of application
4.2 Operate and non-operate requirements
4.3 Speech immunity performance
5 The transmitter
6 Electrical characteristics
Annex A (normative): Speech immunity test signal
Annex B (informative): Example test signal
Annex C (informative): Bibliography
History
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