1、 ETSI EG 202 192 V1.1.2 (2004-11)ETSI Guide Speech Processing, Transmission and Quality Aspects (STQ);Comparison of PBX transmission requirementsin ANSI/TIA-464-C and ETSI ES 201 168 V1.2.1ETSI ETSI EG 202 192 V1.1.2 (2004-11) 2 Reference DEG/STQ-00039 Keywords digital, transmission ETSI 650 Route d
2、es Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded fro
3、m: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be
4、 the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available
5、at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyri
6、ght and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2004. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently be
7、ing registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI EG 202 192 V1.1.2 (2004-11) 3 Contents Intellectual Property Rights4 Foreword.4 Introduction 4 1 Scope 5 2 References 5 3
8、 Abbreviations .6 4 Reference model.6 5 Requirements7 5.1 Loss and loss - related parameters8 5.1.1 Port to port insertion loss 8 5.1.1.1 Insertion loss ranges and variations 9 5.1.1.2 Digital pad disabling .12 5.1.2 Frequency response.12 5.1.2.1 Comparison of both definitions of frequency response.
9、12 5.1.2.2 Analogue to digital/digital to analogue .13 5.1.3 Levels14 5.1.3.1 Comparison of both definitions of interfaces levels14 5.1.3.2 Interface levels 14 5.1.3.3 Level tracking: tracking error15 5.1.3.4 Level tracking: overload compression 15 5.1.3.5 Signal levels 16 5.1.4 Hybrid balance17 5.1
10、.5 Input impedance18 5.1.6 Echo loss.19 5.1.7 Stability loss19 5.2 Voice impairment parameters.20 5.2.1 Noise.20 5.2.1.1 Weighted noise20 5.2.1.2 3-kHz flat noise.20 5.2.1.3 Single frequency noise 21 5.2.1.4 Spurious out of band signals .21 5.2.2 Balance .22 5.2.2.1 Longitudinal balance.22 5.2.2.2 T
11、ransverse balance22 5.2.3 Crosstalk .23 5.2.4 Distortion 23 5.2.4.1 Quantization distortion23 5.2.4.2 Single frequency distortion .24 5.2.5 Delay.24 5.3 Loudness levels 24 5.4 Other impairment parameters .25 5.4.1 Intermodulation distortion 25 5.4.2 Group delay distortion 26 5.4.3 Impulse noise 26 5
12、.4.4 Jitter 26 5.4.5 Gain hit .27 5.4.6 Phase hit27 5.4.7 Dropout.27 Annex A (informative): Bibliography.28 History 29 ETSI ETSI EG 202 192 V1.1.2 (2004-11) 4 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
13、pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Se
14、cretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314
15、(or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This ETSI Guide (EG) has been produced by ETSI Technical Committee Speech Processing, Transmission and Quality Aspects (STQ). The present document is a Telecommunications Systems
16、Bulletin (TSB), jointly produced by: Telecommunications Industry Association (TIA) Subcommittee TR-41.1, Multiline Telecommunications Systems (MLTS); and European Telecommunications Standards Institute (ETSI) Technical Committee (TC) Speech processing, Transmission and Quality aspects (STQ). The doc
17、ument is being published as a TIA TSB-147 and as an EG. The document is not an industry standard and compliance to its contents is voluntary. The document compares corresponding Private Branch eXchange (PBX) transmission requirements in TIA and ETSI standards to be considered when developing equipme
18、nts or standards intended for global application. ETSI has granted TIA permission to use copyrighted material from ES 201 168 8, in the TIA TSB-147. Likewise, TIA has granted ETSI permission to use copyrighted material from ANSI/TIA-464-C 7, in the present document. Introduction Over the last decade
19、, continuing telecommunications improvements have brought the continents closer together - digital signalling allows calls to be established in less than a second and digital transmission has improved voice quality. Such changes have made it convenient to call anywhere in the world without a thought
20、 being given to past difficulties in completing such calls with acceptable transmission quality. These improvements have made it possible for multi-national companies to efficiently conduct business in a real-time environment and to be able to efficiently design and produce world-wide products. This
21、 gives impetus to international telecommunications equipment suppliers and users of such equipment to consider the differences in transmission requirements of PBX systems that are manufactured for different world marketplaces. The present document provides a comparison of North America and European
22、PBX standards with the goal of creating maximum commonality for serving the global PBX marketplace, while recognizing the existence of differences in regional telecommunications environments, regulatory practices, geographic constraints, and customer expectations. Technical differences between the T
23、IA and PBX standards are identified and rationalized. ETSI ETSI EG 202 192 V1.1.2 (2004-11) 5 1 Scope The present document compares, in an orderly manner, like transmission requirements in ANSI/TIA-464-C 7 and those in ES 201 168 8. Since only the PBX transmission requirements in ANSI/TIA-464-C 7 an
24、d ES 201 168 8 are compared, it is necessary to examine relevant portions of the scope of each of these standards to gain an overall idea of the scope of the comparison. ES 201 168 8 provides transmission requirements while ANSI/TIA-464-C 7 provides transmission requirements as well as other PBX par
25、ameters, e.g. signalling and supervision. All appearance of ANSI/TIA-464-C 7 in the present document includes ANSI/TIA-464-C-1 7. The following table is an overview comparison of the two documents: ANSI/TIA-464-C ES 201 168 SCOPE Digital PBX Digital PBX with test point TRAFFIC 3,1 kHz voice 3,1 kHz
26、voice CODING (at interface to network) -law A-law Measurement Port-to-port (full-channel) Port-to-test point (half-channel) INCLUDES (interfaces): Analogue Digital Cordless Loud-speaking (hands-free) Proprietary sets Yes Yes No No Yes Yes Yes Yes No Yes Non-transmission requirements Yes No Test meth
27、ods for compliance No Yes 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a sp
28、ecific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 ITU-T Recommendation G.122 (1993): “Influence
29、 of national systems on stability and talker echo in international connections“. 2 ITU-T Recommendation G.711 (1988): “Pulse code modulation (PCM) of voice frequencies“. 3 ITU-T Recommendation G.712 (2001): “Transmission performance characteristics of pulse code modulation channels“. 4 ITU-T Recomme
30、ndation O.41 (1994): “Psophometer for use on telephone-type circuits“. 5 ITU-T Recommendation Q.551 (2002): “Transmission characteristics of digital exchanges“. 6 ETSI TR 101 802 (V1.1.1): “Speech processing, Transmission and Quality Aspects (STQ); The Concept of Relative Levels“. 7 ANSI-TIA-464-C-2
31、002: “Telecommunications - Multiline Terminal Systems - Requirements for PBX Switching Equipment“. ETSI ETSI EG 202 192 V1.1.2 (2004-11) 6 8 ETSI ES 201 168 (V1.2.1): “Speech processing, Transmission and Quality Aspects (STQ); Transmission characteristics of digital Private Branch eXchanges (PBXs) f
32、or interconnection to private networks, to the public switched network or to IP gateways“. 9 ANSI/TIA-968-A-2002 and ANSI/TIA-968-A-1-2003: “Telecommunications - Telephone Terminal Equipment - Technical Requirements for Connection of Terminal Equipment to the Telephone Network“. 10 ANSI T1.508-2004:
33、 “Network Performance - Loss Plan for Evolving Digital Networks“. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: AAL(A) Analogue Access Line - Analogue connection to analogue or digital Central Office AAL(D) Analogue Access Line - Digital connection to a
34、n analogue Central Office ATT Analogue Tie Trunk - Private network connection to a remote PBX DAL Direct Access Line - Digital connection to a digital Central Office or another PBX DGS DiGital Station (telephone) DID Data IDentifier DMW Digital MilliWatt ERL Echo Return Loss FCC Federal Communicatio
35、ns Commission FEXT Far End Cross Talk GoS Grade-of-Service K2 Analogue 2-wire trunk interface to analogue PSTN access line KD Digital trunk interface to digital PSTN access line L2 Analogue 2-wire extension interface LCL Longitudinal Conversion Loss LD Digital line interface to ISDN compatible TE M2
36、 Analogue 2-wire tie-line interface M4 Analogue 4-wire tie-line interface MD Digital tie-line interface MS Specific (non-analogue) tie-line interface NL Nominal Loss OLR Overall Loudness Rating ONS Line interface to on-premises station OPS Line interface to Off-Premises Station qdu quantizing distor
37、tion unitRED Relative Envelope Delay RLR Receive Loudness RatingSLR Send Loudness Rating TBRL Terminal Balance Return Loss TE Terminal EquipmentZLP Zero Level Point 4 Reference model Each of the documents in this comparison specifies the interfaces to which the PBX can connect and make connections b
38、etween. An understanding of these interfaces is integral to the proper interpretation and application of the transmission requirements being compared. Figure 1 presents a simplified model of the PBX interfaces in terms of the ETSI interface designations. The correspondence to TIA interface designati
39、ons is shown in the figure. Note that there is no ETSI designation for an Off-Premises Station interface; thus the TIA designation is used for that interface. ETSI ETSI EG 202 192 V1.1.2 (2004-11) 7 KD = DAL or AAL(D) K2 = AAL(A) LD = DGS L2 = ONS MD = DAL M2 = ATT M4 = ATT NOTE: Interfaces are repr
40、esented by: Analogue 2-wire Analogue 4-wire interface * Digital interface A/D or D/A conversion Figure 1: Representative PBX network connections 5 Requirements On the following pages, the corresponding requirements in each document are referenced and then compared side-by-side. This is followed by a
41、n analysis of the comparison where applicable. Additional sheets provide tables, figures, and background explanation for specific requirements. ETSI ETSI EG 202 192 V1.1.2 (2004-11) 8 5.1 Loss and loss - related parameters 5.1.1 Port to port insertion loss ANSI/TIA-464-C ES 201 168 6.2.3 Insertion l
42、oss criteria for PBX 6.2.5 PBX loss ranges Table 12 PBX loss plan 3.1.5 Transmission loss 5.2.1 Nominal transmission loss (analogue interfaces) 6.2 Nominal transmission loss (digital interfaces) 7.2 Nominal transmission loss (system specific MS interfaces) 9.2 Transmission loss between interfaces Cl
43、ause A.4.2: Measurements The insertion loss is specified as port-to-port loss between PBX interfaces and loss ranges. Requirements are formatted in a loss plan matrix; each matrix cell defines the nominal insertion loss in dB for both directions of transmission. Table 1 gives the PBX loss plan for c
44、onnections. Conditions: Measured at 1 004 Hz (nominal) with both source and measuring instruments at 600 impedance. Nominal transmission loss NL is defined as the difference between relative input level Liof one port and the relative output level Lo of the other port in a connection, including the l
45、oss SL of a digital gain- or loss-pad. NL = Li- Lo+ SL where Liand Loare in dBr referenced to 0 dBr. The values for Liand Lomust be stated by the supplier. Conditions: Measured at 1 020 Hz (nominal) with a test level of -10 dBm0 (clause A.4.2). Analysis: In ETSI, neither the port-to-port loss nor th
46、e allocation of loss is specified. However, the port-to-test point loss must be stated by the supplier on the basis of input/output levels. These losses are in many cases subject to national requirements, which differ from country to country on the signal levels at the point of connection to the PST
47、N while maintaining a harmonized requirement at the point of connection to the ISDN. In TIA, the port-to-port-losses for PBXs were developed based on the loss plans for public and private networks. The PBX loss plan is intended to provide satisfactory Grade-of-Service (GoS) performance and compatibi
48、lity with the public and private network loss plans. The following assumptions were the prime considerations: 1) The transmission loss and level plan of the PSTN, which is primarily an all-digital network with some fixed loss as described in ANSI T1.508-2004 10, forms a basis for the private network
49、 loss plan. 2) Digital end offices insert 6 dB of loss, as described in ANSI T1.508-2004 10, in the receive direction of analogue access lines to ensure network stability and echo control. 3) Transmission facilities to be used have losses compatible with the PBX port-to-port losses. 4) PBX port-to-port losses associated with analogue interfaces apply to any trunks with analogue terminations at the PBX. 5) PBX port-to-port losses associated with digital interfaces apply to any trunks with digital terminations at the PBX. 6
