1、 ETSI ES 203 021-2 V2.1.2 (2006-01)ETSI Standard Access and Terminals (AT);Harmonized basic attachment requirements for Terminals forconnection to analogue interfaces of the Telephone Networks;Update of the technical contents ofTBR 021, EN 301 437, TBR 015, TBR 017;Part 2: Basic transmission and pro
2、tection ofthe network from harmETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 2 Reference RES/AT-010134 Keywords access, POTS, PSTN, terminal ETSI 650 Route des 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
3、but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: 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 perceive
4、d difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be 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 a
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6、http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. All rights reserved. DEC
7、TTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being 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 Organ
8、izational Partners. ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 3 Contents Intellectual Property Rights5 Foreword.5 1 Scope 6 2 References 6 3 Definitions and abbreviations.6 3.1 Definitions6 3.2 Abbreviations .8 4 Requirements8 4.1 Impedance unbalance about earth 8 4.1.1 Quiescent state 8 4.1.2 Loop st
9、eady state 9 4.1.2.1 Longitudinal Conversion Loss 9 4.1.2.2 Output Signal Balance.9 4.2 Sending level limitations 9 4.2.1 Mean sending level .9 4.2.2 Instantaneous voltage10 4.2.3 Sending level in a 10 Hz bandwidth .10 4.2.4 Sending level between 4,3 kHz and 200 kHz .11 4.2.5 Sending level from 200
10、kHz to 30 MHz.11 4.3 Power feeding limitations.12 4.4 Automatically repeated call attempts .13 Annex A (informative): Test methods.14 A.1 General .14 A.1.1 Acoustic environment for tests.14 A.1.2 Powered state14 A.2 Details for testing of voice stimulated TE14 A.2.1 Voice signal to be used during te
11、sts .14 A.2.1.1 Type of test signal.14 A.2.1.2 Levels15 A.2.2 Electro-acoustic interfaces15 A.2.2.1 Handset .15 A.2.2.2 Hands-free.15 A.2.2.3 Headset .15 A.2.2.4 Other interfaces.16 A.3 Feeding bridge16 A.4 Test methods 16 A.4.1 Impedance unbalance about earth 16 A.4.1.1 Quiescent state 16 A.4.1.2 L
12、oop steady state 17 A.4.1.2.1 Longitudinal Conversion Loss (LCL) .17 A.4.1.2.2 Output Signal Balance.18 A.4.2 Sending level limitations 19 A.4.2.1 Mean sending level .19 A.4.2.2 Instantaneous voltage20 A.4.2.3 Sending level in a 10 Hz bandwidth .21 A.4.2.4 Sending level between 4,3 kHz and 200 kHz .
13、22 A.4.2.5 Sending level from 200 kHz to 30 MHz.23 A.4.3 Power feeding limitations.24 A.4.4 Automatically repeated call attempts .25 Annex B (informative): Requirements Table (RT) .26 ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 4 B.1 Guidance for completion of the RT26 B.1.1 Condition table .26 B.1.2 Re
14、quirements Table26 History 28 ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and
15、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 Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/I
16、PR/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 (or the updates on the ETSI Web server) which are, or may be, or may become, essential
17、to the present document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Access and Terminals (AT). The present document is a minor editorial update of the first version to include text which was omitted from tables B.1 and B.2. The present document is part 2 of a mult
18、i-part deliverable covering technical updates to the TBRs as identified below: Part 1: “General aspects“; Part 2: “Basic transmission and protection of the network from harm“; Part 3: “Basic Interworking with the Public Telephone Networks“. NOTE: Standardizes the aspects of interworking with the net
19、work. ES 203 021-3 only applies to TE intended for switched networks. ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 6 1 Scope The present document is a part of a multi-part deliverable. It specifies basic compatibility and interoperability aspects, including basic transmission, which are applicable to all
20、 Terminal Equipment (TE) intended to be connected to analogue interfaces of public or private, switched or non switched telephone networks. The present document is applicable to a TE which is capable of accessing an analogue telephone network line at the Network Termination Point (NTP). The present
21、document is intended to ensure that no harm occurs to the network. 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
22、version number) or non-specific. For a specific 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-
23、T Recommendation G.117: “Transmission aspects of unbalance about earth“. 2 ITU-T Recommendation P.59: “Artificial conversational speech“. 3 ITU-T Recommendation G.101: “The transmission plan“. 4 ITU-T Recommendation P.64: “Determination of sensitivity/frequency characteristics of local telephone sys
24、tems“. 5 ITU-T Recommendation P.51: “Artificial mouth“. 6 ITU-T Recommendation P.340: “Transmission characteristics and speech quality parameters of hands-free terminals“. 7 ITU-T Recommendation P.380: “Electro-acoustic measurements on headsets“. 8 ETSI ES 203 021-1: “Access and Terminals (AT); Harm
25、onized basic attachment requirements for Terminals for connection to analogue interfaces of the Telephone Networks; Update of the technical contents of TBR 021, EN 301 437, TBR 015, TBR 017; Part 1: General Aspects“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present doc
26、ument, the following terms and definitions apply: connection to earth: all the following points, as applicable, are connected to the earth point during measurement: a point in the TE which is intended to be connected to mains earth (in practice this might be carried out by connecting to the earth of
27、 the mains source which is supplying the TE); connector points which are intended to be connected to earth during the normal operation of the apparatus. ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 7 dBV: absolute voltage level expressed in decibels with respect to 1 V longitudinal conversion loss: As de
28、scribed in ITU-T Recommendation G.117 1 clause 4.1.3. loop state: state where the TE draws sufficient DC current to activate the exchange loop steady state: loop state excluding the transitions from and to quiescent state Network Termination Point (NTP): physical point at the boundary of the Telepho
29、ne Network intended to accept the connection of a TE NOTE: See figure 1. Output Signal Balance (OSB): As described in ITU-T Recommendation G.117 1 clause 4.3.1. peak to peak voltage: difference between the maximum and minimum voltage during any 10 ms window quiescent state: state where the TE draws
30、insufficient DC current to activate the exchange Reference Impedance ZR: complex impedance made up of 270 in series with a parallel combination of 750 and 150 nF NOTE: This is shown in figure A.1 of ES 203 021-1 8. Reference Impedance ZRHF: complex impedance made up of 120 in series with a parallel
31、combination of 150 and 47 nF and in series with a parallel combination of 750 and 150 nF NOTE: This is shown in figure A.2 of ES 203 021-1 8. Telephone Network (TN): telecommunication network mainly exchanging voice band signals NOTE: TN is a general term for PSTN, non-switched leased lines and Priv
32、ate telephone networks. Terminal Connection Point (TCP): point of the TE intended to be connected to the Telephone Network NOTE: An adapter may be required between the terminal and the existing national network termination point in individual countries. Such an adapter is outside the scope of the pr
33、esent document (see figure 1). Suitable adapter and/or installation facilities TE TCP NTP TCP interface NTP interface TN Figure 1: Terminal connection point and network termination point Terminal Equipment (TE): equipment intended to be connected to the TN; i.e.: to be connected directly to the term
34、ination (NTP) of a TN; or to interwork with a TN being connected directly or indirectly to the NTP; in order to send, process or receive information. The system of connection may be wire, radio, optical or other electromagnetical system. NOTE: TE intended to be connected to public networks may be su
35、bject to particular regulatory treatment, whereas TE intended to be connected to private networks are usually not subject to particular regulatory treatment. ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 8 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AC Al
36、ternating Current DC Direct Current DTMF Dual Tone Modulation Frequency HFRP Hands-Free Reference Point ICP Installation Connection Point LCL Longitudinal Conversion Loss MRP Mouth Reference Point NTP Network Termination Point OSB Output Signal Balance PSTN Public Switched Telephone Network rms root
37、 mean square TCP Terminal Connection Point TE Terminal EquipmentTN Telephone Network 4 Requirements 4.1 Impedance unbalance about earth 4.1.1 Quiescent state Justification: Protection of the network from harm. Unbalance may cause crosstalk. The impedance unbalance about earth is expressed as the Lon
38、gitudinal Conversion Loss (LCL) in this clause. Requirement: The Longitudinal Conversion Loss when the AC termination of the TE is 600 shall be at least the values given in table 1 and figure 2. Table 1: Unbalance about earth Frequency range Minimum value 50 Hz to 600 Hz 40 dB 600 Hz to 3 400 Hz 46
39、dB 3 400 Hz to 3 800 Hz 40 dB 4046dB50 600 3 400HzNot to scale3 800Figure 2: Unbalance about earth ETSI ETSI ES 203 021-2 V2.1.2 (2006-01) 9 Test: The test shall be conducted according to clause A.4.1.1. 4.1.2 Loop steady state Justification: Protection of the network from harm. Unbalance may cause
40、crosstalk. The impedance unbalance about earth is expressed as Longitudinal Conversion Loss (LCL) when the TE is in the receiving mode and Output Signal Balance (OSB) when in the transmitting mode. The requirements during the loop steady state apply when the TE has been in the loop state for a minim
41、um of 1,2 s with a line feeding current which can be obtained when the TE is connected to a source of 50 V DC in series with a resistor within the range of 2 800 to 400 . For the purpose of conducting the test of clauses A.4.1.2 and A.4.2 including all clauses the maximum feed resistance of 2 800 sh
42、all be replaced by 2 300 for TE declared to be intended for use only on lines providing a loop current of 18 mA or greater. 4.1.2.1 Longitudinal Conversion Loss Requirement: The LCL when the AC termination of the TE is 600 shall be at least the values given in table 1 and figure 2. Test: The test sh
43、all be conducted according to clause A.4.1.2.1. 4.1.2.2 Output Signal Balance Requirement: The OSB when the AC termination of the TE is 600 shall be at least the values given in table 1 and figure 2. Test: This requirement will only be completely tested at frequencies where the unbalance level excee
44、ds -70 dBV with the test method shown in clause A.4.1.2.2. Measurement results below -70 dBV will only be noted as compliant, no value will be registered. Voice TE is stimulated by a Pseudo Speech Signal at a level defined in clause A.2.1.2, table A.1, column “Nominal“. 4.2 Sending level limitations
45、 These requirements apply to all states except during loop disconnect dialling and register recall signalling. It also does not apply to transient conditions (seizing and releasing the line), which are not considered states. Justification: Protection of the network from harm is assured by limiting t
46、he signal sent by the TE so that the interfering effects of the signal can be predicted and avoided. 4.2.1 Mean sending level This requirement does not apply to DTMF signals. Requirement: The mean sending level in the frequency range 200 Hz to 3 800 Hz over a one-minute period shall not be greater t
47、han -9,7 dBV when the TE interface is terminated with the reference impedance ZR. Test: The test shall be conducted according to clause A.4.2.1. Voice TE is stimulated by a pseudo speech signal at a level defined in clause A.2.1.2, table A.1, column “Nominal“. ETSI ETSI ES 203 021-2 V2.1.2 (2006-01)
48、 104.2.2 Instantaneous voltage Requirement: The peak to peak voltage in the frequency range 200 Hz to 3 800 Hz shall not exceed 5 Vpp when the TE interface is terminated with the reference impedance ZR. NOTE: It is recognized that due to the statistical nature of speech signals, the peak to peak vol
49、tage level could under some circumstances of real use exceed 5 V. It is recommended that when stimulated with the pseudo speech signal at a level of +10 dBPa, the peak to peak voltage measured in the frequency band 100 Hz to 20 kHz should not exceed 8,0 V when the TE interface is terminated with the reference impedance ZR. Test: The test shall be conducted according to clause A.4.2.2. Voice terminal is stimulated by a pseudo speech signal at a level defined in clause A.2.1.2, table A.1, column “5 Vpp“. 4.2.3 Sending
