ETSI ES 200 778-2-2002 Access and Terminals (AT) Analogue Access to the Public Switched Telephone Network (PSTN) Protocol Over the Local Loop for Display and Related Services Termi_1.pdf

1、ETSI ES 200 778-2 VI 2.2 (2002-11) ETSI Standard 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 2 ETSI ES 200 778-2 VI .2.2

2、(2002-1 1) Reference DESIAT-030016 Keywords access, analogue, CLIP, local loop, protocol, PSTN, supplementary service ETSI 650 Route des Lucioles F-O6921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 O0 Fax: +33 4 93 65 47 16 Siret No 348 623 562 00017 - NAF 742 C Association but non lucratif

3、 enregistre la Sous-prfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: http:lwmv.etsi .arq The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference i

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6、eproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Standards Institute 2002. All rights reserved. DECTTM, PLUGTESTSTMand UMTSTMare Trade Marks of ETSI registered for the benefit of its M

7、embers. TIPHONTM and 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 3 ETSI ES 200 778-2 VI .2.2 (2002-1 1) Contents Intellectual

8、Property Rights 4 Foreword . 4 1 Scope 5 2 References . .5 3 Definitions and abbreviations. . .6 Definitions . . 6 3.1 Abbreviations . 6 3.2 4 4.1 4.2 4.2.1 4.2.2 4.3 4.3.1 4.3.2 4.3.3 4.4 4.4.1 5 5.1 5.2 5.3 5.3.1 5.3.2 5.4 5.5 5.6 Physical layer requirements . .6 Loop state . 6 Data transmission .

9、 6 . 6 . 7 Timer requirements . . 7 . 7 . 7 . . 8 . . 8 . . 8 Datalink layer. . .8 Channel seizure . . 8 Mark signal . 8 Message type . . 8 . 8 . 8 Message length . 8 Checksum . 8 Incorrect checksum . 9 Network and TE interoper TE Alerting Signal (TAS). . Voice path muting and end time TE - Acknowle

10、dgement signal. Valid message type Unknown message type . 6 7 Safety 9 8 History 1 O Presentation layer - message interpretation . .9 ElectroMagnetic Compatibility (EMC) . .9 ETSI 4 ETSI ES 200 778-2 VI .2.2 (2002-1 1) Intellectual Property Rights IPRs essential or potentially essential to the prese

11、nt document may 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 O00 314: “Intellectual Property Rights (7PRs); Essential, orpotentially Essential, IPRs notlJied to ETSI in resp

12、ect ofETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (5). 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 refer

13、enced in ETSI SR O00 3 14 (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). The present document is part 2 of a multi-part deliverab

14、le covering the Protocol over the local loop for display and related services; Terminal equipment requirements, as identified below: Part 1 : “On-hook data transmission“; Part 2: “Off-hook data transmission“; Part 3 : “Protocol Implementation Conformance Statement (PICS) proforma specification; On-H

15、ook and Off-Hook“; Part 4: Part 5: “Test Suite Structure and Test Purposes (TSS On-Hook and Off-Hook“; “Abstract Test Suite (ATS) and partial Protocol Implementation extra Information for Testing (PIXIT) proforma specification for the user; On-Hook and Off-Hook“. The present document replaces EN 300

16、 778-2 which has been withdrawn. There are no technical differences between the present document and the former EN 300 778-2. There are, however, editorial differences e.g. ES 200 778-2 does not include the test procedures because they are are now included in ES 200 778-3, ES 200 778-4 and ES 200 77

17、8-5. ETSI 5 ETSI ES 200 778-2 VI .2.2 (2002-1 1) 1 Scope The present document specifies the electrical characteristics and the functional characteristics for Terminal Equipment (TE) for connection to the network termination point (NTP) of a Public Switched Telephone Network (PSTN) interface providin

18、g a Protocol Over The local Loop For Display Services, based on the protocols defined in EN 300 659-2 3 and EN 300 659-3 4. The present document contains only additional requirements with respect to the requirements in ES 200 778-1 i. The present document does not speciSl any method to cater for dis

19、tinction between several TE-ACK, if sent, when more than one TE is off-hook on the same line. The present document applies to off-hook data transmission only. A TE intended for off-hook data transmission shall also be able to receive a on-hook data transmission. The present document is not written f

20、or regulatory purposes. The requirements are intended to ensure correct reception and detection of the received data. The method of displaying the received data is not defined. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of

21、the present document. References are either specific (identified by date of publication andor edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. il ETSI ES 200 778-1: “Access and Te

22、rminals (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 transmission“. ETSI EN 300 659-1: “Access and Terminals (AT); Analogue access to the Public Switched Te

23、lephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 1 : On-hook data transmission“. ETSI EN 300 659-2: “Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop f

24、or display (and related) services; Part 2: Off-hook data transmission“. ETSI EN 300 659-3: “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 3: Data link message and param

25、eter codings“. 21 31 41 ETSI 6 ETSI ES 200 778-2 VI .2.2 (2002-1 1) 3 Definitions and abbreviations 3.1 De fi nit ions For the purposes of the present document, the terms and definitions given in EN 300 659-1 2, EN 300 659-2 3, ES 200 778-1 11 and the following apply: off-hook signalling state: stat

26、e of the TE when in the loop state, the TE is capable of receiving Frequency-Shift Keying (FSK) data transmission, and the normal transmission functions are suspended 3.2 Abbreviations For the purposes of the present document, the abbreviations defined in EN 300 659-1 2, EN 300 659-2 3, ES 200 778-1

27、 11 and the following apply: TE-ACK TE Acknowledgement Signal 4 Physical layer requirements 4.1 Loop state There are no loop state access requirements under the present document. Loop state requirements are given in relevant access standards. 4.2 Data transmission 4.2.1 Network and TE interoperation

28、 1) The LE starts the handshaking sequence by sending a TE Alerting Signal (TAS) and muting of the voice paths at the LE. 2) 3) 4) 5) 6) After detection of the TAS the TE mutes voice paths and disables any manual signalling facility. The TE returns a TE-Acknowledgement signal (TE-ACK) to the LE. The

29、 TE enters the off-hook signalling state. The LE recognizes a valid TE-ACK, and starts data transmission to the TE. After data transmission is completed, the TE and LE restores any voice paths and the TE enables any manual signalling facility. If the LE does not receive a valid TE-ACK, the data is n

30、ot transmitted and after a time-out period the TE restores any voice paths and enables any manual signalling facility. If for any other reason the TE does not receive data transmission, the TE, after a time-out period, restores any voice paths and enables any manual signalling facility. See also fig

31、ure 1. ETSI 7 Timer I Value ETSI ES 200 778-2 VI .2.2 (2002-1 1) Description 4.2.2 TE Alerting Signal (TAS) The TE shall detect a TAS, DT-AS, as specified in table 1 TA Table 1 : DT-AS signal characteristics 85 ms IThe maximum time between end of the DT-AS and start of the Du ration 180 ms f 5 ms TT

32、E-ACK NOTE: The detector must not detect normal speech or similar signals generated on the line by the users, as a TAS. It is equally important that the detector can recognize the TAS in the presence of normal speech or similar signals from the own user, as the TE is normally not muted when receivin

33、g the TAS. 65 ms to 90 ms IDuration of the TE-ACK, a DTMF “D“ 4.3 Ti mer requirements TF T“ Table 2: Off-hook timers 295 ms 120 ms The maximum time the TE waits for the start of data transmission. Measured from the start of the TE-ACK Maximum restoration time to loop state DT-AS TE-ACK DTMF “D“ Off-

34、hook signalling state DATA TRANSMISSION 1 Figure 1 : Handshaking sequence and timing requirements 4.3.1 Voice path muting and end time The TE shall mute the voice paths and disable any manual signalling facility before the start of the TE-ACK signal. The voice paths and any manual signalling facilit

35、y shall remain muted until the end of the data transmission and be restored within Tu. If there is no data transmission they shall remain muted until after the Time-out, T, and restoration shall be within Tu (see table 2). 4.3.2 TE - Acknowledgement signal The TE shall start sending a TE-ACK to the

36、LE, within TA from the end of a TAS. The TE-ACK signal shall be of duration and description as in table 2. NOTE: It is recommended that the sending of the TE-ACK signal avoids overlap with the received DT-AS signal. ETSI 8 ETSI ES 200 778-2 VI .2.2 (2002-1 1) 4.3.3 Start time The TE shall correctly

37、detect a data transmission starting within 95 ms to T, from the start of the TE-ACK signal (see table 2). 4.4 Data signals Data signals requirements described in ES 200 778-1 i shall apply, but with the levels as defined in the following clause. 4.4.1 Levels The TE shall be capable of correctly rece

38、iving FSK signalling tones with levels within the range-1 1 dBV to -33 dBV measured between the line terminals and with a twist between the mark and space tones not exceeding 6 dB. 5 Datalink layer The structure of the datalink packet is shown in annex D of EN 300 659-1 2. 5.1 Channel seizure NOTE:

39、There is no channel seizure signal transmitted from the LE in the off-hook state. 5.2 Mark signal The TE shall correctly receive datalink packets with the following Mark signal field length: 80 mark bits I25 mark bits. 5.3 Message type 5.3.1 Valid message type The TE shall meet the appropriate messa

40、ge type requirements defined in ES 200 778-1 i. 5.3.2 Unknown message type If the TE receives an unknown message type, the TE shall restore voice paths and enable any manual signalling facilities within Tu from the end of the FSK data and either ignore the message or indicate an error. 5.4 Message l

41、ength The TE shall meet the message length requirements defined in ES 200 778-1 i. 5.5 C h ec ksu m The TE shall meet the checksum requirements defined in ES 200 778-1 i. ETSI 9 ETSI ES 200 778-2 VI .2.2 (2002-1 1) 5.6 Incorrect checksum If an incorrect checksum is detected the TE shall restore voic

42、e paths and enable any manual signalling facility within Tu from the end of the FSK data and shall either ignore the message or indicate an error. 6 Presentation layer - message interpretation Presentation layer message interpretation requirements described in ES 200 778-1 11 shall apply. 7 Safety S

43、afety requirements are outside the scope of the present document. Safety requirements are published by CENELEC. 8 ElectroMagnetic Compatibility (EMC) EMC requirements are outside the scope of the present document. ETSI 10 ETSI ES 200 778-2 VI .2.2 (2002-1 1) Edition 1 v1.2.1 vl.l.l v1.2.2 History January 1998 May 200 1 July 2002 Membership Approval Procedure MV 20020906: 2002-07-09 to 2002-09-06 November 2002 Publication Publication as ETS 300 778-2 Publication as EN 300 778-2 (Withdrawn) ETSI