1、 TIA-4953-A (Revision of TIA-4953) October 2015Telecommunications Communications Products Amplified Telephone Measurement Procedures and Performance Requirements ANSI/TIA-4953-A-2015 APPROVED: OCTOBER 26, 2015 NOTICE TIA Engineering Standards and Publications are designed to serve the public interes
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23、ENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-PN-4953-A i TABLE OF CONTENTS 1 OVERVIEW _ 1 1.1 SCOPE _ 1 1.2 COMPLIANCE TO HEARING LOSS CATEGORIES _ 1 1.3 MEASUREMENT REQUIREMENTS _ 1 1.4 OTHER TELEPHONY PERFORMANCE CONSIDERATIONS _ 1 1.5 SAFETY PER
24、FORMANCE CONSIDERATIONS _ 1 1.6 ENVIRONMENTAL CONSIDERATIONS _ 1 1.7 CATEGORIES OF CRITERIA _ 1 2 NORMATIVE REFERENCES _ 2 3 DEFINITIONS ABBREVIATIONS, AND ACRONYMS, _ 3 3.1 DEFINITIONS _ 3 3.2 ABBREVIATIONS AND ACRONYMS _ 4 4 PERFORMANCE REQUIREMENTS SUMMARY _ 5 4.1 NARROWBAND AND WIDEBAND HANDSET
25、PERFORMANCE REQUIREMENTS SUMMARY _ 5 4.2 NARROWBAND AND WIDEBAND SPEAKERPHONE PERFORMANCE REQUIREMENTS SUMMARY _ 7 5 HANDSET ACOUSTIC REQUIREMENTS AND TESTING PROCEDURES _ 9 5.1 MAXIMUM RECEIVER VOLUME MEASUREMENT _ 9 5.1.1 Requirements _ 9 5.1.2 Test Procedure _ 9 5.2 MAXIMUM ACOUSTIC RINGER LEVEL
26、MEASUREMENT _ 10 5.2.1 Requirement _ 10 5.2.2 Test Procedure _ 10 5.3 HANDSET ACOUSTICS FOR HEARING LOSS CATEGORIES _ 10 5.3.1 Requirements _ 11 5.3.2 Test Procedure _ 12 5.4 RINGER ACOUSTICS FOR HEARING LOSS CATEGORIES _ 14 5.4.1 Requirement _ 14 5.4.2 Test Procedure _ 15 5.5 NON-IMPAIRED HEARING T
27、ELEPHONE ACOUSTICS _ 15 5.5.1 Requirements _ 15 5.5.2 Test Procedure _ 15 5.6 ACOUSTIC HEARING AID COMPATIBILITY PERFORMANCE _ 16 5.6.1 Requirement _ 16 5.6.2 Test Procedure _ 16 5.7 TIA1083 HEARING AID COMPATIBILITY (HAC) PERFORMANCE _ 16 5.7.1 Requirement _ 16 5.7.2 Test Procedure _ 16 5.8 OTHER O
28、PERATIONAL ISSUES _ 16 6 SPEAKERPHONE ACOUSTIC REQUIREMENTS AND TESTING PROCEDURES _ 17 6.1 MAXIMUM RECEIVER VOLUME MEASUREMENT _ 17 6.1.1 Requirements _ 17 ANSI/TIA-PN-4953-A ii 6.1.2 Test Procedure _ 17 6.2 MAXIMUM ACOUSTIC RINGER LEVEL MEASUREMENT _ 18 6.3 SPEAKERPHONE ACOUSTICS FOR HEARING LOSS
29、CATEGORIES _ 18 6.3.1 Requirements _ 18 6.3.2 Test Procedure _ 20 6.4 RINGER ACOUSTICS FOR HEARING LOSS CATEGORIES _ 21 6.5 NON-IMPAIRED HEARING SPEAKERPHONE ACOUSTICS _ 21 6.5.1 Requirements _ 21 6.5.2 Test Procedure _ 21 ANNEX A. (NORMATIVE) GENERAL INFORMATION _ 22 A.1 CONVERSATIONAL GAIN _ 22 A.
30、2 MAXIMUM RECEIVER VOLUME _ 22 A.3 NOMINAL VOLUME CONTROL SETTING _ 22 A.4 NOMINAL TONE CONTROL SETTING _ 22 A.5 HIGH FREQUENCY EMPHASIS (HFE) _ 23 A.6 HEARING LOSS CATEGORIES _ 24 A.7 RECEIVE TEST SIGNAL LEVELS _ 24 A.8 “PRE-QUALIFIED” RECEIVE SIGNALS FOR DISTORTION AND NOISE _ 24 A.8.1 Receive Sig
31、nal to Distortion and Noise (SDNR) _ 25 A.8.2 Receive Noise SNR _ 25 A.9 SEND, SIDETONE (HANDSET ), AND STABILITY _ 25 A.10 ACOUSTIC HEARING AID COMPATIBILITY _ 25 A.11 MAGNETIC HEARING AID COMPATIBILITY (HAC) _ 26 A.12 RINGER (ALERTER) MAXIMUM SOUND PRESSURE LEVEL _ 26 A.13 RINGER (ALERTER) HEARING
32、 LOSS CATEGORIES _ 26 A.14 RECEIVE OUTPUT CONSISTENCY _ 26 A.15 SEND OUTPUT FOLLOWING RECEIVE SIGNAL _ 26 ANNEX B. (NORMATIVE) TESTING AND MEASUREMENT METHODS _ 27 B.1 RECEIVE PERFORMANCE TESTING METHODS _ 27 B.1.1 Receive Frequency Response _ 27 B.1.2 Receive Acoustic Level _ 27 B.1.3 Receive High
33、Frequency Emphasis (HFE) _ 27 B.1.4 Receive Signal to Distortion and Noise (SDNR) _ 29 B.1.5 Receive Noise SNR _ 29 B.2 SEND PERFORMANCE TESTING METHODS _ 30 B.2.1 Send Frequency Response _ 30 B.2.2 Send Output _ 30 B.3 SIDETONE PERFORMANCE TESTING METHODS _ 30 B.3.1 Sidetone Frequency Response _ 30
34、 B.3.2 Sidetone Loudness _ 30 B.4 RECEIVE OUTPUT CONSISTENCY METHODS _ 30 B.5 SEND OUTPUT FOLLOWING RECEIVE SIGNAL METHODS_ 30 B.6 TELEPHONE STABILITY TESTING METHODS _ 31 B.6.1 Analog Handset Telephone _ 31 ANSI/TIA-PN-4953-A iii B.6.2 Digital Telephone Handset Stability Testing Methods _ 32 B.6.3
35、Digital Speakerphone Stability Testing Method _ 32 B.6.4 Analog Speakerphone Stability Testing _ 32 B.7 RINGER (ALERTER) HL PERFORMANCE TESTING METHODS _ 33 B.8 TEST EQUIPMENT _ 35 B.8.1 Handset Testing Artificial Ear Couplers and Test Position _ 35 B.8.2 Analog Telephone Testing _ 35 B.8.2.1 DC Fee
36、d Circuit _ 35 B.8.2.2 Ringer Test Circuit _ 35 B.8.2.3 Test Signals _ 35 ANNEX C. (INFORMATIVE) REQUIREMENTS AND MEASUREMENTS RATIONALE _ 36 C.1 TELEPHONE HANDSET MEASUREMENT EQUIPMENT _ 36 C.2 TEST SIGNAL LEVELS _ 37 C.3 HEARING LOSS CATEGORIES RATIONALE _ 37 C.3.1 Volume Control and Gain _ 38 C.3.2 Hearing Loss Frequency Response _
