1、g3g3TSB-31-D-1(Addendum to TSB-31-D)g3July 2012TelecommunicationsTelephone Terminal Equipment Rationale and Measurement Guidelines For U.S. Network Protection-Addendum 1g3NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings
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22、MENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. TSB-31-D-1 iTable of Contents 1. SCOPE . 1 2. MODIFICATIONS TO TSB-31-D . 1 2.1 Changes to Sub-Clause 14.2.5 . 1 2.2 Changes to Sub-Clause 14.2.6 . 1 2.3 Changes to Figures 2
23、TSB-31-D-1 iiFOREWORD (This foreword is not part of this Standard.) This document is an addendum to TIA TSB-31-D, Telecommunications Telephone Terminal Equipment Rationale and Measurement Guidelines for U.S. Network Protection. It was developed to address shortcomings that have been found with the r
24、eceive volume control test procedures in clause 14.2. In particular, the test circuit for analog telephones did not properly depict the battery feed circuit and artificial cable required for measurements on these products. In addition, the input signal level specified for testing digital telephones
25、was found to cause excessive distortion and has been lowered. Finally, the discussion of how to apply test results for the Receive Loudness Rating (RLR) measurements used in current standards to the Receive Objective Loudness Rating (ROLR) requirements specified by FCC Part 68 rules has been enhance
26、d and clarified. This addendum was produced by Subcommittee TR-41.9, Technical and Administrative Regulatory Considerations. It was developed in accordance with TIA procedural guidelines, and represents the consensus position of the Subcommittee, which served as the formulating group. It also receiv
27、ed the concurrence of Engineering Committee TR-41, User Premises Telecommunications Requirements. The leadership of the TR-41.9 Technical and Administrative Regulatory acknowledges the written contributions provided by the following individuals in the development of this addendum. Organization Repre
28、sentative TSB-31-C-1 Whitesell Consulting Stephen R Whitesell checkbldEditor Cisco Systems, Inc. Tim Lawler checkbld Suggestions for improvement of this standard are welcome. They should be sent to: Telecommunications Industry Association Engineering Department Suite 300 2500 Wilson Boulevard Arling
29、ton, VA 22201 ( http:/www.tiaonline.org ) TSB-31-D-1 1 1. SCOPE This addendum provides changes to TSB-31-D, Telecommunications Telephone Terminal Equipment Rationale and Measurement Guidelines for U.S. Network Protection. Clause 2 provides modifications to the text for the receive volume control tes
30、t procedures and alternative test methods found in sub-clauses 14.2.5 and 14.2.6, respectively, of TSB-31-D. It also provides replacements for Figures 14.2-1 and 14.2-2. The other clauses and sub-clauses in TSB-31-D are not affected. Additions to the text are shown underlined and deletions are shown
31、 using strikeout. Words that appear in underlined italics are intended as instructions to the reader. 2. MODIFICATIONS TO TSB-31-D 2.1 Changes to Sub-Clause 14.2.5 Modify step (5) in sub-clause 14.2.5 to read as follows: (5) Set the sinewave generator to 1000 Hz and adjust its output to produce -10
32、dBV across the 10 ohm resistor of the matching pad The generator output is to be adjusted to an open circuit voltage of 0.316 volt (i.e., -10 dBV) from a 900 ohm source for analog telephones. For digital telephones apply a signal level of -7 dBm0 -16 dBm0 to the input of the reference codec. If the
33、sampling frequency used by the reference codec is a multiple of 1000 Hz, adjust the input frequency to the codec to be in the range of 1004 to 1020 Hz. If a frequency other than 1000 Hz is used, the selective voltmeter is to be tuned to the actual frequency used when making the nominal 1000 Hz measu
34、rement. 2.2 Changes to Sub-Clause 14.2.6 Modify the text of sub-clause 14.2.6 to read as follows: Although 47 C.F.R., 68.317 specifies the receive volume control requirement in terms of ROLR as defined in IEEE 661-1979 (R2008), current industry standards TIA-470.110-C (replaces TIA-470-A) and TIA-81
35、0-B (replaces TIA-579) have shifted to measuring receive loudness in terms of Receive Loudness Rating (RLR) as defined by ITU-T Recommendation P.79. Annex G of TIA-470.110-C provides the following relationship between these two loudness rating measures: ROLR (IEEE 661) = RLR (ITU-T P.79) + 51 dB Thi
36、s relationship was derived from measurements of the G-type handset used on the Western Electric 500-type telephone and measured with an ITU-T Recommendation P.57 Type 1 artificial ear (IEC 318 coupler). The relationship may differ when testing other types of handsets that do not seal on the knife-ed
37、ge of the Type 1 ear or when a Type 3.3 artificial ear with a flexible rubber pinna is used for the testing as required by the current industry standards. In this case, both the ROLR and RLR values should be calculated from the same measured frequency response curve to determine the appropriate rela
38、tionship between the two for the specific combination of handset geometry and artificial ear. The resulting relationship may then be used to determine if RLR values obtained according to the methods in TIA-470.110-C and TIA-810-B comply with Part 68 criteria specified in terms of ROLR. For digital t
39、elephones, the sinewave generator and reference codec may be replace by a means for directly generating a digital bit stream in the appropriate format that is equivalent to the digital bit stream that would be produced from the reference codec with the specified sinewave signal applied. TSB-31-D-1 2
40、 2.3 Changes to Figures Replace Figure 14.2-1 with the following figure and note (the figure caption remains the same): Note: The generator output is to be adjusted to an open circuit voltage of 0.316 V (i.e., -10 dBV) from a 900 ohm source. Replace Figure 14.2-2 with the following figure (the figure caption remains the same): g3g3g3g3g3
