Tr-41. 4-03-05-024 Telecommunications

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IP Telephony Equipment

Voice Gateway Transmission Requirements

PN-3-4826-RV1 (TIA-912-A)

Draft 3.2 (April 15, 2003)

Editor: Roger Britt

1. Swapped Fig 3a and 3b per Francois and Tailey.

2. All TIA-968-A-1 related changes.

3. Changed DEO pad from 3 to 6 dB.

4. Added support for MTAs and IADS in conjunction with the revision of T1.508.

Copyright Notice:

The contributor grants a free, irrevocable, non-exclusive license to the Telecommunications Industry Association (TIA) to incorporate text or other copyrightable material contained in this contribution and any modifications thereof in the creation of a TIA Publication; to copyright and sell in TIA’s name any TIA Publication even though it may include all or portions of this contribution; and at TIA’s sole discretion to permit others to reproduce in whole or in part such contribution or the resulting TIA Publication. This contributor will also be willing to grant licenses under such copyrights to third parties on reasonable, non-discriminatory terms and conditions for the purpose of practicing a TIA Publication that incorporates this publication.

This contribution has been prepared by Nortel Networks to assist the TIA TR-41 Engineering Committee or one of its sub-elements as noted above. It is offered as a basis for discussion and is not to be construed as a binding proposal on Nortel Networks. Nortel Networks specifically reserves the right to amend or modify the material contained herein, and nothing herein shall be construed as conferring or offering licenses or rights with respect to any intellectual property of Nortel Networks other than as provided in the copyright statement above.

Intellectual Property Statement:

The individual preparing this contribution is unaware of any patents or published pending patent applications, the use of which may be essential to the practice of all or part of this contribution when incorporated into a TIA Publication.


1 Introduction 1

1.1 General 1

1.2 Purpose 1

1.3 Categories of Performance Criteria 1

2 Scope 2

2.1 Compliance Reference Point 2

2.2 Compliance Interpretation 2

2.3 Regulatory Issues 2

2.4 Changes Relative to TIA-912 2

3 References 4

4 Definitions, Abbreviations and Acronyms 5

4.1 Voice Gateway Definition 5

4.2 Insertion Loss Definition 5

4.3 Sound Pressure Level Definition 5

4.4 Loudness Rating Definitions 5

4.5 Port Definitions 6

4.6 Port Descriptions 6

4.7 Abbreviations and Acronyms 9

5 Preamble 10

5.1 General 10

5.2 Reference Impedance 10

6 Loss and Level Plans 11

6.1 Introduction 11

6.2 Port-to-Port Loss Allocation 11

6.3 Digital Padding 12

6.4 Voice Gateway Loss Plan Assumptions 12

6.5 Full-Channel Loss and Level Plan 13

6.6 Half-Channel Loss and Level Plan 17

7 Loss Parameters 21

7.1 Frequency Response 21

7.2 Tracking Error and Overload Compression 21

8 Echo Control and Return Loss 24

8.1 Hybrid Balance Requirements 24

8.2 Input Impedance Requirements 25

9 Noise and Distortion Impairments 27

9.1 Idle-Channel Noise 27

9.2 Longitudinal Balance 28

9.3 Crosstalk 30

9.4 Quantization Distortion 30

9.5 Single-Frequency Distortion 30

10 Other Impairments 31

10.1 Intermodulation Distortion 31

10.2 Envelope Delay 32

10.3 Impulse Noise 34

10.4 Jitter 34

10.5 Gain Hit 34

10.6 Phase Hit 34

10.7 Dropout 34

10.8 Peak-to-Average Power Ratio 34

11 Signal Levels 35

Annex A (informative) - Measurement Guidelines 36

A.1 Gain Ripples in the Measurement Path 36

A.2 Transmission Level Translation 36

A.3 Dial-up Port for Trunk Testing 36

A.4 Digital Test Port Availability 36

A.5 Hybrid Balance 37

A.6 Input Impedance 37

A.7 Idle Channel Noise 41

A.8 Longitudinal Balance 42

A.8.1 Longitudinal to Metallic Balance 42

A.8.2 Metallic to Longitudinal (Transverse) Balance 42

A.8.2.1 Transverse Balance Test (Analog) 43

A.8.2.2 Transverse Balance Test (Digital) 46

A.9. Crosstalk Coupling Loss 47

Annex B (informative) - Telephony Loss Level Planning Overview 49

B.1 Introduction 49

B.2 Send and Receive Levels 49

B.2.1 Telephone Equipment Loudness Ratings 50

B.2.2 Overall Loudness Ratings 50

B.2.3 Optimum Overall Loudness Ratings 51

B.2.4 Network Interface Equivalent Loudness Ratings 52

B.3 Port-to-Port Loss Allocation 52

B.4 DTMF Overload on Analog Trunks 53

B.5 Open Loop Loss and Network Stability 54

B.6 Reference Levels 55

B.6.1 Zero-Level Point 55

B.6.2 0 dBm0 Definition 55

B.6.3 Digital Milliwatt 55

B.6.4 Transmission Level Translation 56

Annex C (informative) - Loss Definitions 57

C.1 Echo Return Loss (ERL) 57

C.2 Return Loss (RL) 58

C.3 Transhybrid Loss (THL) 58

Annex D (informative) - Pan-European Loss and Level Plans 59

D.1 Half-Channel Loss and Level Plan 59

D.2 Full-Channel Loss and Level Plan 60

Annex E (informative) - IP Transmission Impairments 61

E.1 Delay 61

E.2 Packet Loss 61

E.3 Voice Gateways and Network Performance 61

E.4 Voice Quality of Service 62


(This foreword is not part of this standard.)

This document is a TIA/EIA Telecommunications Technical Standard produced by Subcommittee
TR-41.4 of Committee TR-41. This standard was developed in accordance with TIA/EIA procedural guidelines, and represents the consensus position of the Subcommittee, which also served as the formulating group. This standard is based on TIA-912.

The TR-41.4 IP Telephony Gateways Subcommittee acknowledges the contribution made by the following individuals in the development of this standard.



Roger Britt

Nortel Networks


Richard Frank

Dietrich Lockard Group

Richard Hatherill

Aurial Systems

Dermot Kavanagh

Nortel Networks

Dorothy Lockard

Dietrich Lockard Group

Joachim Pomy


Tailey Tung

Siemens ICN

There are five annexes in this standard.

Suggestions for improvement of this standard are welcome. They should be sent to:

Telecommunications Industry Association

Engineering Department

Suite 300

250 Wilson Boulevard

Arlington, VA 22201

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