1、 ETSI ES 202 971 V1.2.1 (2006-03)ETSI Standard Access and Terminals (AT);Public Switched Telephone Network (PSTN);Harmonized specification of physical and electricalcharacteristics of a 2-wire analogue interfacefor short line interfaceETSI ETSI ES 202 971 V1.2.1 (2006-03) 2 Reference RES/AT-010131 K
2、eywords 2-wire, access, analogue, interface, POTS, PSTN 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 but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Importan
3、t 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 perceived difference in contents between such versions, the reference version is the Po
4、rtable 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 aware that the document may be subject to revision or change of status. Informat
5、ion on the current status of this and other ETSI documents is available 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
6、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. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit
7、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 Organizational Partners. ETSI ETSI ES 202 971 V1.2.1 (2006-03) 3 Contents Intellectu
8、al Property Rights5 Foreword.5 Introduction 5 1 Scope 6 2 References 6 3 Definitions, symbols and abbreviations .8 3.1 Definitions8 3.2 Symbols9 3.3 Abbreviations .9 4 General .9 5 Physical connections 10 5.1 Mechanical aspects.10 5.2 Support of more than one terminal.11 5.2.1 Wiring arrangement 11
9、5.2.2 Loading factors .11 6 DC feed conditions.11 6.1 Polarity .11 6.2 Quiescent state11 6.2.1 Maximum voltage.11 6.2.2 Minimum voltage11 6.2.3 Supply interruption .12 6.3 Loop current .12 6.3.1 Loop current range12 6.3.2 Loop current interruptions caused by the terminal .12 7 Seize signal.12 7.1 Mu
10、st not seize condition.12 7.2 Must seize condition.12 8 Clear signal.13 8.1 Clear signal generated by TE .13 8.2 Clear indication from the network13 8.3 Seizing the line for a new call 13 9 Impedance 13 9.1 Impedance at the R interface 13 9.2 Balance about earth 14 10 Transmission 14 10.1 Relative l
11、evel14 10.2 Variation of gain with input level.15 10.3 Frequency response 16 10.4 Coding law .16 10.5 Noise 16 10.5.1 Weighted noise .16 10.5.2 Single frequency noise17 10.6 Echo and stability .17 10.6.1 Echo17 10.6.2 Stability.17 10.7 Crosstalk.17 10.8 Total distortion including quantizing distorti
12、on .18 11 DTMF Dialling.18 ETSI ETSI ES 202 971 V1.2.1 (2006-03) 4 12 Ringing.18 12.1 Ringing drive capability .19 12.1.1 Ringing frequency 19 12.1.2 Ringing voltage.19 12.1.2.1 Ringing with DC .19 12.1.2.2 Ringing without DC 19 12.2 Ring cadence 20 12.3 Ring trip .21 12.4 False ring trip .21 13 Sup
13、ervisory signals 21 13.1 Supervisory tones .21 13.2 Tone levels .21 13.3 Cadences and frequencies.22 14 Optional functions22 14.1 Loop disconnect dialling 22 14.2 Register recall.22 14.3 Metering .22 14.4 Supplementary and other enhanced services 23 14.5 Polarity reversal23 14.6 End of call signal (
14、“K-break“)23 14.7 Payphones.23 Annex A (informative): Test set-up for the change from DC to ringing voltage 24 Annex B (informative): Bibliography.25 History 26 ETSI ETSI ES 202 971 V1.2.1 (2006-03) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may ha
15、ve been declared to ETSI. The information 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 stand
16、ards“, which is available from the ETSI Secretariat. 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 oth
17、er 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 to the present document. Foreword This ETSI Standard (ES) has been produced by ETSI Technical Committee Access and Terminals (AT). Introduction The present process of harm
18、onization of the 2-wire analogue voice band switched interface (traditionally PSTN) has focussed on harmonization of the terminal equipment. Now that the terminal harmonization process is nearing completion, it becomes feasible to move towards harmonization of the network termination point (NTP) its
19、elf. This is particularly true for new local access delivery systems which tend to provide service via short local loops. The present document specifies technical characteristics for an interface digital on the network side and analogue on the terminal side. The technology on the network side is uns
20、pecified. ETSI ETSI ES 202 971 V1.2.1 (2006-03) 6 1 Scope The present document is applicable to an analogue presented interface intended to deliver 3,1 kHz voiceband services which terminates a Public Switched Telephone Network (PSTN) with 2-wire local loops. The signal is digitally encoded on the n
21、etwork side of the interface, but the technology is not specified. The present document applies to interfaces where any terminal equipment (TE) connected to the interface is connected via a cable with a maximum loop resistance of 100 . NOTE: This is equivalent to approximately 500 metres of cable wi
22、th 0,5 mm diameter copper conductors. See figure 1 for clarification. The objective of the present document is to specify the physical and electrical characteristics at an analogue interface. The present document specifies characteristics of the interface to enable it to operate with most existing n
23、ational PSTN TE, and especially with PSTN TE designed according to the European standards for analogue presented TEs. The electrical conditions specified for the interface are sufficient to ensure satisfactory operation of the following functions of TE: a) call control; b) transmission; c) dialling;
24、 d) ringing. 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 specific refere
25、nce, 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 ETSI TBR 021: “Terminal Equipment (TE); Attachment require
26、ments for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE (excluding TE supporting the voice telephony service) in which network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling“. 2 ETSI TR 101 768: “Public Swit
27、ched Telephone Network (PSTN); Study on the generation of analogue ringing signals“. 3 ETSI TBR 038: “Public Switched Telephone Network (PSTN); Attachment requirements for a terminal equipment incorporating an analogue handset function capable of supporting the justified case service when connected
28、to the analogue interface of the PSTN in Europe“. 4 ETSI EN 300 659-1: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 1: On-hook data transmission“. 5 ETSI EN 300 659-2
29、: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 2: Off-hook data transmission“. ETSI ETSI ES 202 971 V1.2.1 (2006-03) 7 6 ETSI TR 101 183: “Public Switched Telephone N
30、etwork (PSTN); Analogue ringing signals“. 7 ETSI ES 201 235-1: “Specification of Dual Tone Multi-Frequency (DTMF) Transmitters and Receivers; Part 1: General“. 8 ETSI ES 201 235-3: “Access and Terminals (AT); Specification of Dual-Tone Multi-Frequency (DTMF) Transmitters and Receivers; Part 3: Recei
31、vers“. 9 ETSI ES 201 729: “Public Switched Telephone Network (PSTN); 2-wire analogue voice band switched interfaces; Timed break recall (register recall); Specific requirements for terminals“. 10 ETSI TR 101 041-1: “Human Factors (HF); European harmonization of network generated tones; Part 1: A rev
32、iew and recommendations“. 11 ETSI ETR 344: “Terminal Equipment (TE); The technical feasibility of a harmonized plug and socket standard for European Public Switched Telephone Network (PSTN) access“. 12 ETSI ES 201 187: “2-wire analogue voice band interfaces; Loop Disconnect (LD) dialling specific re
33、quirements“. 13 ETSI EG 201 120: “Public Switched Telephone Network (PSTN); Method of rating terminal equipment so that it can be connected in series and/or in parallel to a Network Termination Point (NTP)“. 14 ETSI ES 201 071: “Public Switched Telephone Network (PSTN); Protocol over the local loop
34、for display services; Server Display and Script Services (SDSS)“. 15 ETSI ES 200 778-1: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Protocol over the local loop for display and related services; Terminal Equipment requirements; Part 1: On-hook data tr
35、ansmission“. 16 ETSI ES 200 778-2: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Protocol over the local loop for display and related services; Terminal Equipment requirements; Part 2: Off-hook data transmission“. 17 ETSI ES 201 912: “Access and Termina
36、ls (AT); Short Message Service (SMS) for PSTN/ISDN; Short Message Communication between a fixed network Short Message Terminal Equipment and a Short Message Service Centre“. 18 ETSI TR 101 182: “Analogue Terminals and Access (ATA); Definitions, abbreviations and symbols“. 19 ITU-T Recommendation G.7
37、11 (1988): “Pulse code modulation (PCM) of voice frequencies“. 20 ITU-T Recommendation G.100.1 (2001): “The use of the decibel and of relative levels in speechband telecommunications“. 21 ITU-T Recommendation Q.35/E.180 (1998): “Technical characteristics of tones for the telephone service“. 22 ITU-T
38、 Recommendation Q.552 (2001): “Transmission characteristics at 2-wire analogue interfaces of digital exchanges“. 23 ITU-T Recommendation G.117 (1996): “Transmission aspects of unbalance about earth“. 24 ITU-T Recommendation V.92 (2000): “Enhancements to Recommendation V.90“. 25 ITU-T Recommendation
39、G.223 (1988): “Assumptions for the calculation of noise on hypothetical reference circuits for telephony“. 26 ITU-T Recommendation G.712 (2001): “Transmission performance characteristics of pulse code modulation channels“. 27 ITU-T Recommendation G.168 (2004): “Digital network echo cancellers“. 28 I
40、TU-T Recommendation G.131 (2003): “Talker echo and its control“. ETSI ETSI ES 202 971 V1.2.1 (2006-03) 8 29 ITU-T Recommendation G.122 (1993): “Influence of national systems on stability and talker echo in international connections“. 30 ITU-T Recommendation G.120 (1998): “Transmission characteristic
41、s of national networks“. 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: answer signal: indication that a terminal is answering an incoming call called party answer signal: signal which may be provided at t
42、he call originating NTP by the network to indicate that the called party has answered the call clear indication: indication that the network is attempting to release a connection clear signal: signal indicating that a terminal is attempting to release a connection end-of-call signal: signal provided
43、 at the NTP by the network to indicate that the call has been released half-connection: bidirectional path comprised of an input connection and an output connection input connection: unidirectional path from an analogue TE connection point to an interface of a digital path NOTE: See figure 4. longit
44、udinal conversion loss: measure of the degree of unbalance about earth NOTE: More information is given in ITU-T Recommendation G.117 23, clause 4.1.3. output connection: unidirectional path from an interface of a digital path to the analogue TE connection point NOTE: See figure 4. R interface: analo
45、gue presented POTS/PSTN interface derived from digital terminating equipment NOTE: This definition is consistent with the definition in ITU-T Recommendation I.411 (see bibliography), however other types of interfaces that also fit definition in ITU-T Recommendation I.411 are also possible (e.g. data
46、 interfaces). Transmission (unspecified digital technology) User installation PSTN R interface Terminal Equipment 2-wire analogue presented interface Suitable adapter and/or installation facilities ( 100 ) Figure 1: 2-wire analogue presented interface (R-interface) ringing state: condition of the ne
47、twork where a ringing/alerting signal has been applied at the NTP ring trip: removal of the ringing signal at the NTP in response to a valid answer signal applied to the NTP seize signal: signal indicating that a terminal is attempting to establish a connection by means of applying a loop condition
48、ETSI ETSI ES 202 971 V1.2.1 (2006-03) 9 user installation: any installation between the R-interface and the end users terminal equipment 3.2 Symbols For the purposes of the present document, the following symbols apply: dBV absolute voltage level expressed as dB relative to 1 V dBm0 absolute power l
49、evel in dBm referred to a point of zero relative level (dBm is the absolute power level expressed as dB relative to 1 mVA) dBmp decibel psophometrically weighted dBr relative level of a signal in a transmission path referred to the level at a reference point on the path mVrms milliVolts root mean squared NOTE: For more information on dB-related issues, see ITU-T Recommendation G.100.1 20. 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: AC Alternating Current
