1、 TIA STANDARD Telecommunications Telephone Terminal Equipment Alerter Acoustic Output Performance Requirements for Analog Telephones TIA-470.220-C Revision of TIA/EIA-470-B) APRIL 2004 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunications industry in association with the Electr
2、onic Industries Alliance ANSI/TIA-470.220-C-2004 Approved: April 20, 2004 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE TIA Engineering Standards and Publications are d
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7、applicability of regulatory limitations before its use. (From Standards Proposal No. 3-4350.220-RV3, formulated under the cognizance of the TIA TR-41.3 Subcommittee on Analog and Digital Wireline Terminals.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2004 Standards and Technology Departmen
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21、license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-The TR-41.3.7 Working Group acknowledges the contribution made by the following individuals in the developme
22、nt of this standard. Name Representing Position (If Applicable) Don McKinnon AST Technology Labs, Inc. Chair / Editor Ron Magnuson Siemens Editor Dave Stenner Advent Instruments Fred Bonhomme Atlinks Glenn R. Hess MWM Acoustics Rick Carey RadioShack Amar Ray Sprint Al Baum Uniden Jimmy Smith Wyle La
23、bs The TR-41.3.7 Working Group, which had the technical responsibility during the development of this standard, had the following participating members. Name Representing James Bress AST Technology Labs Jim McNeill Atlinks Jim Mazzolini Casio Communications Pierluigi Pacciardi Casio Communications R
24、ick White CIDCO Communications John Bareham Consultant in Electroacoustics Len Bleile ESP Berndt Martenson ETSI Harry Van Zandt ESC Technologies Ken Macdonald Microtronix Systems Steve Kropp VTech Steve Whitesell VTech Copyright Telecommunications Industry Association Provided by IHS under license w
25、ith EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-470.220-C i TABLE OF CONTENTS 1. SC
26、OPE _ 1 2. REFERENCES_ 2 2.1. NORMATIVE . 2 2.2. INFORMATIVE 2 3. ABBREVIATIONS, ACRONYMS, AND DEFINITIONS _ 3 3.1. ABBREVIATIONS AND ACRONYMS . 3 3.2. DEFINITIONS 3 4. TECHNICAL REQUIREMENTS _ 4 4.1. CATEGORIES OF CRITERIA. 4 4.2. TEST EQUIPMENT PERFORMANCE 4 4.3. ALERTER SENSITIVITY . 5 4.3.1. Res
27、ponse to Ringing Signals 5 4.3.1.1. Requirement 5 4.3.1.2. Method of Measurement 5 4.3.2. Reproduction of Distinctive Ringing Patterns 7 4.3.2.1. Ringing Cycle 7 4.3.2.2. Requirements. 7 4.3.2.3. Method of Measurement 8 4.3.3. Non-Response to Other Signals . 9 4.3.3.1. Requirements. 9 4.4. ALERTER A
28、COUSTIC OUTPUT 13 4.4.1. General . 13 4.4.2. Frequency Content of Electronic Alerters 13 4.4.2.1. Requirements. 13 4.4.2.2. Method of Measurement 13 4.4.3. Alerter Sound Pressure. 14 4.4.3.1. Individual f1 and f2 Sound Pressure Level Requirements . 14 4.4.3.2. Average Alerter Sound Pressure Level Re
29、quirements. 14 4.4.3.3. Method of Measurement 14 4.4.4. Effect of Voltage Variations of the Applied Ringing Signal . 16 4.4.4.1. Requirement 16 4.4.4.2. Method of Measurement 16 ANNEX A (NORMATIVE) RINGER SIMULATION CIRCUIT _ 17 ANNEX B (INFORMATIVE) SELECTED APPLICATION CPE _ 18 ANNEX C (INFORMATIV
30、E) EXAMPLES OF STEP-LIKE VOLTAGE CHANGES _ 19 ANNEX D (INFORMATIVE) ALERTER F1 AND F2 FREQUENCIES _ 21 ANNEX E (INFORMATIVE) A-WEIGHTING CURVE_ 22 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without lic
31、ense from IHS-,-,-TIA-470.220-C ii Table of Figures Figure 1 Ringing 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 C
32、ircuit 11 Figure 6 One Possible CPE Simulator with Pulse Dial Control Circuit . 12 Figure 7 Alerter Measurement Setup 15 Figure 8 Alerter Measurement Setup for Alerters in Handsets. 16 Figure A.1 Idealized Representation of the Ring Generator. 17 Figure C.1 Capture of Step-Like Voltages 19 Figure D.
33、1 Alerter Frequency Components 21 Figure E.1 A-weighting Curve 22 Table of Tables Table 1 Alerter Ringing Signals . 6 Table 2 Simulated Ringing Test Signal Matrix 6 Table 3 On/Off Intervals for Distinctive Ringing Patterns . 8 Table C.1 Step-Like Voltages Levels and Timings 20 Table D.1 Alerter Freq
34、uency Components . 21 Table E.1 A-Weighting Curve 22 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-470.220-C 1 1. SCOPE This standard defines the acoustic and electrical p
35、erformance requirements of analog telephone alerters (sometimes referred to as ringers) connected to the Public Switched Telephone Network (PSTN). This document proposes or references at least one measurement procedure for each technical requirement. However, these procedures are not exclusive. Any
36、measurement procedure and equipment that can result 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 take precedent over the test method. Copyright Telecommunications Industry Associati
37、on Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-470.220-C 22. REFERENCES The following standards contain provisions, which, through reference in this text, constitute provisions of this Standard. At the time of publicati
38、on, 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 natio
39、nal standards published by them. 2.1. NORMATIVE 1. ANSI S1.4-2001, American National Standard Specification For Sound Level Meters 2. ANSI/TIA-968-A-2002 Telecommunications Telephone Terminal Equipment Technical Requirements for Connection of Terminal Equipment to the Telephone Network 2.2. INFORMAT
40、IVE 1. ANSI T1.401-2000, Network to Customer Installation Interfaces Analog Voicegrade Switched Access Lines Using Loop-Start and Ground-Start Signaling. 2. ANSI T1.401.02-2001, Network-to-Customer Installation Interfaces - Analog Voicegrade Switched Access Lines With Distinctive Ringing Features 3.
41、 IEEE Std-13291999, IEEE Standard Method For Measuring Transmission Performance of Handsfree Telephone Sets 4. UL 60950 2002 Safety for Information Technology Equipment, 3rdEdition Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction o
42、r networking permitted without license from IHS-,-,-TIA-470.220-C 3 3. ABBREVIATIONS, ACRONYMS, AND DEFINITIONS 3.1. ABBREVIATIONS AND ACRONYMS For the purposes of this Standard, the following abbreviations and acronyms apply. CO Central Office (Used broadly to describe the telephone switch connecte
43、d to a subscribers line) CPE Customer Premises Equipment LSI Long Silent Interval VMWI Visual Message Waiting Indicator 3.2. DEFINITIONS For the purposes of this Standard, the following definitions apply. Idle: A state of the line when all connected CPE are On-Hook. In-Use: A state of the line when
44、at least one connected CPE is Off-Hook. Line State: The condition of the Tip and Ring interface. It can be either In-Use or Idle. Off-Hook: The state of the CPE when the hook-switch is closed. Refers to the state of a particular CPE rather than the line state. On-Hook: The state of the CPE when the
45、hook-switch is open. Refers to the state of a particular CPE rather than the line state. Ringing Cycle: The interval from the start of the first On Period to the end of the Long Silent Interval. On Period: The interval during a Ringing Cycle in which the ring signal is applied to Tip and Ring. Off P
46、eriod: The interval during a Ringing Cycle in which the ring signal is removed from Tip and Ring. Long Silent Interval: The extended interval of no ring signal after the last On Period of a Ringing Cycle. A-weighted sound pressure: An acoustic measurement made using the A frequency weighting curve s
47、pecified in ANSI S1.4, expressed in dBA, referenced to 20 micropascals. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-470.220-C 44. TECHNICAL REQUIREMENTS CPE alerters pro
48、vide an acoustic output in response to ringing signals supplied to the CPE in the On-Hook State. The following requirements are intended to cover the response of alerters for A-type and B-type ringing signals as identified in TIA-968-A. NOTE: T1.401 network interface standard has eliminated all ringing sign
