1、 ETSI TS 102 971 V1.1.1 (2005-05)Technical Specification 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 TS 102 971 V1.1.1 (2005-05) 2 Reference DTS/A
2、T-010124 Keywords 2-wire, access, analogue, interface, 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 Impo
3、rtant 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 th
4、e 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 aware that the document may be subject to revision or change of status. Info
5、rmation 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 p
6、art 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 2005. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the bene
7、fit 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 TS 102 971 V1.1.1 (2005-05) 3 Contents Intell
8、ectual 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
9、 11 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.
10、1 Must 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 Relati
11、ve level14 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 dist
12、ortion .18 11 DTMF Dialling.18 ETSI ETSI TS 102 971 V1.1.1 (2005-05) 4 12 Ringing.19 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 21 12.3 Ring trip .21 12.4 False ring trip .21 13
13、 Supervisory signals 21 13.1 Supervisory tones .21 13.2 Tone levels .22 13.3 Cadences and frequencies.22 14 Optional functions22 14.1 Loop disconnect dialling 22 14.2 Register recall.22 14.3 Metering .23 14.4 Supplementary and other enhanced services 23 14.5 Polarity reversal23 14.6 End of call sign
14、al (“K-break“)23 14.7 Payphones.24 Annex A (informative): Test set-up for the change from DC to ringing voltage 25 Annex B (informative): Bibliography.26 History 27 ETSI ETSI TS 102 971 V1.1.1 (2005-05) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document ma
15、y have 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 s
16、tandards“, 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
17、 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 to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Access and Terminals (AT). Introduction The present p
18、rocess of harmonization 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 p
19、oint (NTP) itself. 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 netwo
20、rk side is unspecified. ETSI ETSI TS 102 971 V1.1.1 (2005-05) 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 en
21、coded on the network 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 metr
22、es of cable with 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 m
23、ost existing national 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
24、; c) dialling; 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 s
25、pecific 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 ETSI TBR 021: “Terminal Equipment (TE); Atta
26、chment requirements 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
27、: “Public Switched 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 w
28、hen connected 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 ETS
29、I EN 300 659-2: “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 TS 102 971 V1.1.1 (2005-05) 7 6 ETSI TR 101 183: “Public Switch
30、ed Telephone Network (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;
31、 Part 3: Receivers“. 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;
32、 Part 1: A review 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) dialli
33、ng specific requirements“. 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 t
34、he local loop 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: O
35、n-hook data transmission“. 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: “Acce
36、ss and Terminals (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 Reco
37、mmendation G.711 (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 ser
38、vice“. 22 ITU-T 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
39、Recommendation 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 ca
40、ncellers“. 28 ITU-T Recommendation G.131 (2003): “Talker echo and its control“. ETSI ETSI TS 102 971 V1.1.1 (2005-05) 8 29 ANSI/TIA-968-A: “Telecommunications - Telephone Terminal Equipment - Technical Requirements for Connection of Terminal Equipment to the Telephone Network“. 30 ITU-T Recommendati
41、on G.122: “Influence of national systems on stability and talker echo in international connections“. 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
42、 incoming call called party answer signal: signal which may be provided at the 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 termin
43、al is attempting to release a connection end-of-call signal: signal provided 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 c
44、onnection point to an interface of a digital path NOTE: See figure 4. longitudinal conversion loss: measure of the degree of unbalance about earth NOTE: More information is given in ITU-T Recommendation G.117, clause 4.1.3. output connection: an unidirectional path from an interface of a digital pat
45、h to the analogue TE connection point NOTE: See figure 4. R interface: analogue presented POTS/PSTN interface derived from digital terminating equipment NOTE: This definition is consistent with the definition in ITU-T Recommendation I.411, however other types of interfaces that also fit definition i
46、n ITU-T Recommendation I.411 are also possible (e.g. data 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 i
47、nterface (R-interface) ringing state: condition of the network 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 esta
48、blish a connection by means of applying a loop condition user installation: any installation between the R-interface and the end users terminal equipment ETSI ETSI TS 102 971 V1.1.1 (2005-05) 9 3.2 Symbols For the purposes of the present document, the following symbols apply: dBV the absolute voltag
49、e level expressed as dB relative to 1 V dBm0 the absolute power level 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 the 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 d
