1、 TIA-470.330-C (Revision of TIA/EIA-470-B) April 2012Telecommunications Telephone Terminal Equipment Digital Telephone Answering Device Performance Requirements ANSI/TIA-470.330-C-2012 APPROVED: MARCH 23, 2012 NOTICE TIA Engineering Standards and Publications are designed to serve the public interes
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22、OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-470.330-C iTABLE OF CONTENTS 1 SCOPE. 1 2 REFERENCES 2 2.1 NORMATIVE REFERENCES . 2 2.2 INFORMATIVE REFERENCES . 2 3 ABBREVIATIONS, ACRONYMS, AND DEFI
23、NITIONS . 4 3.1 ABBREVIATIONS AND ACRONYMS . 4 3.2 DEFINITIONS . 4 4 TECHNICAL REQUIREMENTS 6 4.1 CATEGORIES OF CRITERIA . 6 4.2 TRANSMISSION PERFORMANCE 6 4.2.1 TRANSMISSION TESTING CONSIDERATIONS . 6 4.2.1.1 Test Arrangements . 7 4.2.1.2 DC Feed Circuit . 10 4.2.1.3 Circuit for Application of Ring
24、ing . 11 4.2.1.4 Send Electrical Test Point (SETP) 11 4.2.1.5 Receive Electrical Test Point (RETP) . 11 4.2.1.6 Artificial Lines 11 4.2.2 SEND PERFORMANCE 12 4.2.2.1 Send Frequency Response 12 4.2.2.2 Send Loudness Rating (SLR) . 15 4.2.2.3 Send Noise 15 4.2.3 RECEIVE PERFORMANCE . 16 4.2.3.1 Receiv
25、e Frequency Response . 16 4.2.3.2 Receive Level 18 4.2.3.3 Receive Noise 21 4.2.4 ELECTRICAL-TO-ELECTRICAL PERFORMANCE . 22 4.2.4.1 Electrical-to-Electrical (Junction) Frequency Response 22 4.2.4.2 Electrical-to-Electrical (Junction) Loudness Rating (JLR) 25 4.2.5 ACOUSTICAL-TO-ACOUSTICAL (OVERALL)
26、PERFORMANCE . 25 4.2.5.1 Acoustical-to-Acoustical (Overall) Frequency Response 26 4.2.5.2 Acoustic-to-Acoustic Overall Loudness Rating (OLR) . 28 4.3 RESISTANCE AND IMPEDANCE . 28 4.4 RING DETECTOR PERFORMANCE . 28 4.4.1 RING SIGNAL ELECTRICAL CHARACTERISTICS 28 4.4.1.1 Requirement 28 4.4.1.2 Method
27、 of Measurement 28 4.4.2 DISTINCTIVE RING SIGNAL CADENCE CHARACTERISTICS 29 4.4.2.1 Requirement 29 4.4.2.2 Method of Measurement 29 TIA-470.330-C ii 4.4.3 NON RESPONSE TO OTHER SIGNALS 29 4.4.3.1 Requirement 29 4.4.3.2 Method of Measurement 29 4.4.4 RING COUNTER RESET 29 4.4.4.1 Requirement 29 4.4.4
28、.2 Method of Measurement 29 4.5 OTHER ANSWERING DEVICE FEATURES . 30 4.5.1 PARALLEL SET DETECTION AND AUTOMATIC RETURN TO ON-HOOK STATE . 30 4.5.1.1 Requirements: 30 4.5.1.2 Method of Measurement 30 4.5.2 VOX TIMEOUT AND AUTOMATIC RETURN TO ON-HOOK STATE 31 4.5.2.1 VOX Incoming Message Speech Level
29、Detection Threshold 31 4.5.2.2 VOX Incoming Message Timing . 31 4.5.3 TIMED DISCONNECT SIGNAL DETECTION AND AUTOMATIC RETURN TO ON-HOOK STATE 32 4.5.3.1 Requirement 32 4.5.3.2 Method of Measurement 32 4.5.4 REMOTE ACCESS . 33 4.5.4.1 DTMF Digit Recognition . 33 4.5.4.2 Noise Immunity . 34 4.5.4.3 Fa
30、lse Detection of Speech as DTMF Digits (DTMF Talkoff) . 35 4.5.4.4 Missed Detection of DTMF Due to Speech (DTMF Takedown) . 35 4.5.4.5 Access Code 36 4.5.5 TOLL SAVER FEATURE 37 4.5.5.1 Requirement: . 37 4.5.5.2 Method of Measurement 37 4.5.6 CALL COUNTER VERIFICATION . 38 4.5.6.1 Requirement 38 4.5
31、.6.2 Method of Measurement 38 4.5.7 MAILBOX RECORDING SPACE AVAILABLE 39 4.5.7.1 Zero Record Time Remaining Indication 39 4.5.7.2 Low record Time Remaining Indication . 39 4.5.8 OGM TONE AMPLITUDE . 39 4.5.8.1 Requirement 39 4.5.8.2 Method of Measurement 39 4.5.9 MUTE OF MICROPHONE TO LINE . 40 4.5.
32、9.1 Requirement 40 4.5.9.2 Method of Measurement 40 4.5.10 CLOCK ACCURACY (FOR TIMESTAMPS). 41 4.5.10.1 Requirement 41 4.5.11 MEMORY RETENTION AFTER POWER FAILS . 41 4.5.11.1 Requirement 41 4.5.11.2 Method of Measurement 41 TIA-470.330-C iiiANNEX A (NORMATIVE) CALCULATION OF LOUDNESS RATINGS . 42 A.
33、1 SEND LOUDNESS RATING: . 43 A.2 JUNCTION LOUDNESS RATING: 43 A.3 OVERALL LOUDNESS RATING: 43 ANNEX B (NORMATIVE) ISO R-40 FREQUENCIES 45 ANNEX C (INFORMATIVE) PERCEPTUAL EVALUATION OF SPEECH QUALITY (PESQ)47 TIA-470.330-C ivTable of Figures Figure 1 Test Setup for Acoustic Measurements . 7 Figure 2
34、 Test Arrangement for Recording Send Message on Internal Storage Medium 7 Figure 3 Test Arrangement for Playing Back Recorded Message to Telephone Line 8 Figure 4 Test Arrangement for Recording Receive Message from Telephone Line 8 Figure 5 Test Arrangement for Playing Back Recorded Message through
35、Speaker 8 Figure 6 Test Arrangement for Call Monitoring Receive Measurement . 9 Figure 7 One Possible DC Feed Circuit . 10 Figure 8 Means for Applying Ring Signal . 11 Figure 9 Artificial Line Segment . 12 Figure 10 Send Frequency Response Limits 14 Figure 11 Receive Frequency Response Limits . 17 F
36、igure 12 Junction frequency response limits 24 Figure 13 Acoustical-to-acoustical frequency response limits 27 Figure 14 - Parallel Set Detection Test Circuits 30 TIA-470.330-C v Table of Tables Table 1 Artificial Line Segment Component Values 12 Table 2 Send Frequency Response Limits . 13 Table 3 S
37、end Loudness Rating Limits . 15 Table 4 Receive Frequency Response Limits 16 Table 5 Receive Level Limits . 19 Table 6 Electrical-to-Electrical (Junction) Frequency Response Limits . 23 Table 7 Electrical-to-Electrical (Junction) loudness rating limits . 25 Table 8 Acoustical-to-acoustical (Overall)
38、 frequency response limits 26 Table A.1 ITU-T P.79 Weighting factors for calculating loudness ratings . 44 Table B.1 ISO R-40, ISO R-10,1/12th Octave and 1/3rd Octave Frequencies 45 TIA-470.330-C viFOREWORD (This foreword is not part of this Standard.) This document is a TIA Telecommunications stand
39、ard produced by Working Group TR-41.3.12 of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Working Group and its parent Subcommittee TR-41.3, which served as the formulating group. There are three annexes in thi
40、s Standard. Annexes A and B are normative and are considered part of this Standard; Annex C is informative and is not considered part of this Standard. The leadership of the TR-41.3.12 Telephone Answering Device Working Group (Chair: Amar Ray, CenturyLink) acknowledges the written contributions prov
41、ided by the following individuals in the development of this document. Organization Representative TIA-470.330-C VTech Steve Whitesell Editor AST Technology Labs James Bress Editor Advent Instruments David Stenner AST Technology Labs Don McKinnon CenturyLink Amar Ray Malden Electronics Kevin Cross T
42、exas Instruments Tom Harley Thomson Roger Hunt Uniden Al Baum VTech Michael Chen VTech Steve Kropp Suggestions for improvement of this Standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 300 2500 Wilson Boulevard Arlington, VA 22201 TIA-
43、470.330-C 1 DIGITAL TELEPHONE ANSWERING DEVICE PERFORMANCE REQUIREMENTS 1 SCOPE This standard provides performance requirements for Customer Premises Equipment (CPE) incorporating a Telephone Answering Device (TAD) and intended for analog wireline connection to the Public Switched Telephone Network
44、(PSTN). Devices meeting these requirements should ensure compatibility and satisfactory performance to the user in a high percentage of installations. A TAD may be a stand-alone device or may be integrated into CPE with other features such as a handset for voice communication (ITAD). Only TADs or IT
45、ADs using digital means of storing voice messages are covered by this standard. Older devices using analog storage technology, such as cassette tapes, are not covered. Only requirements relevant to TAD functions are included in this standard. Other requirements that may also be relevant to CPE havin
46、g TAD functions may be found in other standards of the TIA-470 series. The voice transmission requirements in this standard only apply to TADs operating in a hands free, speakerphone-like mode. Transmission requirements that might be applicable to recording outgoing messages, listening to recorded m
47、essages, etc, using the handset of an ITAD may be covered in a future revision of this standard. This document proposes or references at least one measurement procedure for each technical requirement. However, these procedures are not exclusive. Any measurement procedure and equipment that can resul
48、t in an identical measurement is considered valid. While the procedures may call out specific test points within the requirements, the full range of the requirements takes precedence. TIA-470.330-C 2 2 REFERENCES 2.1 NORMATIVE REFERENCES The following standards contain provisions, which, through ref
49、erence in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards. 1 ANSI/IEEE Std 1329-2010 Standard Method for Measuring Transmission Performance of Speakerphones 2 ANSI/IEEE Std
