1、 TIA-470.220-E (Revision of TIA-470.220-D) June 2016Telecommunications Telephone Terminal Equipment Alerter Acoustic Output Performance Requirements for Analog Telephones ANSI/TIA-470.220-E-2016 APPROVED: JUNE 17, 2016 NOTICE TIA Engineering Standards and Publications are designed to serve the publi
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7、A TR-41 User Premises Telecommunications Requirements, TR-41.3 Subcommittee on Analog and Digital Wireline Terminals. Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology and Standards Department 1320 N. Courthouse Road, Suite 200 Arlington, VA 22201 U.S.A. PRICE: Please refer to current
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23、 OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-470.220-E i Table of Contents 1 SCOPE . 1 2 NORMATIVE REFERENCES . 2 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS . 3 3.1 ABBREVIATIONS AND ACRONYMS . 3 3.2 DEFINITIONS . 3 4 TESTING CONSIDERAT
24、IONS . 4 4.1 TEST EQUIPMENT PERFORMANCE 4 4.2 TEST METHODS 4 4.3 SAFETY . 4 5 TECHNICAL REQUIREMENTS 5 5.1 CATEGORIES OF CRITERIA 5 5.2 ALERTER SENSITIVITY . 5 5.2.1 Response to Ringing Signals 5 5.2.2 Reproduction of Distinctive Ringing Patterns 7 5.2.3 Non-Response to Other Signals 9 5.3 ALERTER A
25、COUSTIC OUTPUT . 13 5.3.1 Alerter Sound Pressure . 13 5.3.2 Effect of Voltage Variations of the Applied Ringing Signal 16 ANNEX A (NORMATIVE) A-WEIGHTING CURVE . 17 ANNEX B (INFORMATIVE) EXAMPLES OF STEP-LIKE VOLTAGE CHANGES . 18 ANNEX C (INFORMATIVE) BIBLIOGRAPHY 20 Table of Figures Figure 1 Ringin
26、g Signal Test Circuit . 5 Figure 2 Alerter Response and Non-Response Graph . 10 Figure 3 On-Hook dc Voltage Non-Response Test Circuit . 10 Figure 4 AC Signals Non-Response Signal Test Circuit . 11 Figure 5 Long Loop False Ringing Detection Circuit . 11 Figure 6 One Possible Telephone Simulator with
27、Pulse Dial Control Circuit . 12 Figure 7 Alerter Measurement Setup . 15 Figure 8 Alerter Measurement Setup for Alerters in Handsets 16 Figure A.1 A-weighting Curve 17 Figure B.1 Capture of Step-Like Voltages . 18 Table of Tables Table 1 Alerter Ringing Signals. 6 Table 2 Simulated Ringing Test Signa
28、l Matrix 6 Table 3 On/Off Intervals for Distinctive Ringing Patterns 8 Table 4 Ringer De-rating function . 14 Table A.1 A-Weighting Curve . 17 Table B.1 Step-Like Voltages Levels and Timings . 19 ANSI/TIA-470.220-E 2 FOREWORD (This foreword is not part of this Standard.) This document is a TIA Telec
29、ommunications standard produced by Subcommittee TR-41.3 of Committee TR-41. This standard was developed in accordance with TIA procedural guidelines, and represents the consensus of the subcommittee, which served as the formulating group. There are three annexes in this Standard. Annex A is normativ
30、e and is considered part of this Standard; Annexes B and C are informative and are not considered part of this Standard. The leadership of the TR-41.3 Subcommittee (Chair: Don McKinnon, AST Technology Labs, Inc., Vice-Chair: Allen Woo, Plantronics Inc.) acknowledges the written contributions provide
31、d by the following individuals in the development of this standard. Organization Representative Previous Version TIA-470.220-E AST Technology Labs, Inc. Don McKinnon Editor Editor AST Technology Labs, Inc. James Bress Editor Siemens Ron Magnuson Editor Advent Instruments Dave Stenner Atlinks Fred Bo
32、nhomme ISED Canada Jason Nixon - ISED Canada Magdoly Rondon - Microsemi Inc. Dean Morgan MWM Acoustics Glenn R. Hess RadioShack Rick Carey Sprint Amar Ray Uniden Al Baum Whitesell Consulting LLC Steve Whitesell Wyle Labs Jimmy Smith Suggestions for improvement of this standard are welcome. They shou
33、ld be sent to: Telecommunications Industry Association Technology and Standards Department Suite 200 1320 North Courthouse Road Arlington, VA 22201 (http:/www.tiaonline.org) ANSI/TIA-470.220-E 3 Introduction The requirements and recommendations in this standard were originally included in the TIA-47
34、0-B standard (and previous versions of the TIA-470 standard). When TIA-470-B was revised, the requirements were divided into subdocuments and ANSI/TIA-470.220-C was published with the requirements for the alerter performance for analog interface telephones. ANSI/TIA-470.220-C changed the method used
35、 to evaluate the acoustic alerter frequency content and calculate the acoustic output level. In previous versions of this standard, the frequency content was described in terms of two fundamental frequencies “f1” and “f2”, which were required to meet a number of specifications including minimum outp
36、ut levels. The “f1” and “f2” concept was retained, but the specifications were relaxed to no longer require them to meet minimum output levels or to even be the largest output level components. This allowed other types of alerting sounds such as melodies to meet the standard. In addition, the output
37、 level specification and method of measurement was changed from the total A-weighted sound power above a reflecting plane to the average A-weighted sound pressure measured at six equal angles around the DUT. ANSI/TIA-470.220-D removed the specification of fundamental frequencies and replaced it with
38、 a requirement that de-rates the contribution of frequency components above 2000 Hz at the rate of 12 dB/octave when calculating the acoustic output level. This current revision removes Type-B ringing but retains Type-A. In 2015 TR-41 received liaison confirmation from ATIS that support for Type-B r
39、inging is no longer required. ANSI/TIA-470.220-E 4 Telephone Terminal Equipment Alerter Acoustic Output Performance Requirements for Analog Telephones 1 SCOPE This standard defines the acoustic and electrical performance requirements of analog telephone alerters (sometimes referred to as ringers). A
40、NSI/TIA-470.220-E 5 2 NORMATIVE REFERENCES The following standards contain provisions, which, through reference 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
41、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 published by them. 1. ANSI S1.4-1983 (R2006), Specification for Sound Level Meters 2. ANSI/TIA-9
42、68-B-2009, Telecommunications - Telephone Terminal Equipment - Technical Requirements for Connection of Terminal Equipment to the Telephone Network 3. ANSI/TIA-968-B-3-2016, Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone N
43、etwork - Addendum 3 ANSI/TIA-470.220-E 6 3 ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3.1 ABBREVIATIONS AND ACRONYMS For the purposes of this Standard, the following abbreviations and acronyms apply. DUT Device Under Test LSI Long Silent Interval VMWI Visual Message Waiting Indicator 3.2 DEFINITIONS F
44、or the purposes of this Standard, the following definitions apply. A-weighted sound pressure: An acoustic measurement made using the A frequency weighting curve specified in ANSI S1.4, expressed in dBA, referenced to 20 micro-pascals. De-rated A-Weighted Sound Pressure Level: A-weighted average soun
45、d pressure level after applying a 12 dB per octave low-pass filter for all frequency components above 2000 Hz. Long Silent Interval: The extended interval of no ringing signal after the last On Period of a ringing cycle. Off-Hook: The state of the DUT when the hook-switch is closed. On-Hook: The sta
46、te of the DUT when the hook-switch is open. On Period: The interval during a ringing cycle in which the ringing signal is applied to Tip and Ring. Off Period: The interval during a ringing cycle in which the ringing signal is removed from Tip and Ring. Ringing Cycle: The interval from the start of t
47、he first On Period to the end of the Long Silent Interval. Type-A Ringing: Ringing at 20 Hz or 30 Hz as defined in ANSI/TIA-968-B ANSI/TIA-470.220-E 7 4 TESTING CONSIDERATIONS Alerters provide an acoustic output in response to ringing signals supplied to the device in the On-Hook State. The followin
48、g requirements are intended to cover the response of alerters for Type-A ringing signals as identified in TIA-968-B. 4.1 TEST EQUIPMENT PERFORMANCE The ring generator in the various test circuits shall be capable of generating the applicable test signals. The source impedance shall be lower than 900
49、 ohms and should be lower than 600 ohms. The test circuit shall use a true RMS Voltmeter. 4.2 TEST METHODS Several performance measurement procedures are established, each of which yields standardized measurement data that may be used for the determination of compliance with this standard. Although this document may reference specific procedures or test equipment, the intent is not to be all-inclusive. Any measurement procedure and equipment that can result in an identical measurement is co
