1、 TIA-920.130-A-1 (Addendum to TIA-920.130-A) July 2012Telecommunications Telephone Terminal Equipment Transmission Requirements for Wideband Digital Wireline Telephones with Headset Addendum 1 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through elimina
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6、se. (From Project No. TIA-PN-920.130-A-1, formulated under the cognizance of the TIA TR-41 User Premises Telecommunications Requirements, TR-41.3 Subcommittee on Analog and Digital Wire line Terminals. Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wils
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22、 FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TIA-920.130-A-1 ii Table of Contents 1. SCOPE 2 2. CLAUSE REVISION 2 TIA-920.130-A-1 iiiFOREWORD (This foreword is not part of this Standard.) This document is a TIA Tel
23、ecommunications standard produced by Working Group TR-41.3.3 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 TR41.3, which served as the formulating group. The leaders
24、hip of the TR-41.3.3 VoIP and PCM Transmission Performance Working Group (Chair: Allen Woo, Plantronics) acknowledges the written contributions provided by the following individuals in the development of this addendum. Organization Representative TIA-920.130-A-1 Plantronics Allen Woo Editor Whitesel
25、l Consulting Steve Whitesell Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department 2500 Wilson Boulevard Suite 300 Arlington, VA 22201 ( http:/www.tiaonline.org ) TIA-920.130-A-1 iv (this page is intentionally
26、 blank) TIA-920.130-A-1 1INTRODUCTION Since TIA-920.130-A was first published in February 2011, an error was discovered that contributed to the need for an amendment for the standard. The RLR normalizing level for TCLwmeasurement for binaural headset is missing in TIA-920.130-A. Clause 2 of this add
27、endum contains changes to TIA-920.130-A. The information in clause 2 of this document identifies the original clause number in TIA-920.130-A that is to be changed. The other clauses in TIA-920.130-A are not affected. TIA-920.130-A-1 2 Telephone Terminal Equipment Headset Acoustic Performance Require
28、ments Addendum 1 1. SCOPE This addendum only provides changes to TIA-920.130-A, “Telecommunications Telephone Terminal Equipment Transmission Requirement for Wideband Digital Wireline Telephones with Headset”. 2. CLAUSE REVISION Replace clause 5.4.1.1 with the following: 5.4.1.1 Requirements The nor
29、malized value of TCLw shall be greater than 52 dB for packet-based headsets and 45 dB for TDM-based headsets with SLR normalized to 10 dB and RLR normalized to 0 dB for monaural headset or 6 dB for binaural headset. This requirement shall be met for at least one of the two input signal levels specif
30、ied in 5.4.1.2. NOTES: 1. As a calculation example for a monaural headset, if the measured TCLw is 48 dB, the measured SLR is 11 dB and the measured RLR is -2 dB, then the normalized value of TCLw = TCLw measured + (10 - SLR) dB + (0 - RLR) dB = 48 dB + (10 - 11) dB + (0 - (-2) dB = 49 dB. 2. The re
31、quirement of 52 dB for packet-based headsets is a function of the -16 dBm0 test signal level and the -64 dBm0A send noise requirement. Measuring TCLw 52 dB can be difficult. 3. If equipped with adjustable receive level, the un-normalized TCLw will decrease in proportion with the increased gain relat
32、ive to the nominal RLR in most cases. For example, if the measured TCLw is 45 dB at nominal RLR and the adjustable receive level adds 12 dB of gain, then un-normalized TCLw (maximum receive level) = 45 dB - 12 dB = 33 dB. 4. The echo impairment perceived by the person at the far-end of the connectio
33、n from a telephone set is a function of the magnitude of the talker echo signal as well as the talker echo path delay. The echo signal becomes more disturbing as the talker echo path delay increases. Thus, a telephone set with adequate TCLw performance on low delay may not provide satisfactory echo
34、loss for connections that have a long delay. 5. Temporally weighted terminal coupling loss (TCLt) is an alternate method for echo measurement, which may be more subjectively relevant, especially in devices with echo suppression or cancellation features. (See IEEE Std 1329.) The performance requirements may need to be changed when using this method.
