1、ETSI EN 300 659-1 VI .3.1 (2001-01) European Standard (Telecommunications series) 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 2 ETSI EN
2、300 659-1 V1.3.1 (2001 -01) Tt- Reference REN/AT-030006-1 Keywords data, PSTN, protocol, 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 enregistre la Sous-p
3、rfecture de Grasse (06) No 7803/88 Important notice Individual copies of the present document can be downloaded from: present document may be made available in more than one electronic version or in print. In any case of existing perceived difference in contents between such versions, the reference
4、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 aware that the document may be subject to revision or change of
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6、egoing restriction extend to reproduction in all media. 8 European Telecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI EN 300 659-1 V1.3.1 (2001 -01) Contents Intellectual Property Rights 4 Foreword 5 1 2 3 3.1 3.2 4 5 5.1 5.2 5.3 6 6.1 Scope 6 References 6 Definitions and
7、abbreviations 7 Definitions 7 Abbreviations 7 Data encoding . 7 Protocol requirements . 8 Presentation layer 8 Data transmission requirements: signalling, timing and tolerance 9 Data Link layer 8 Physical layer 9 Data transmission associated with ringing 10 6.1.1 6.1.2 6.2 6.3 6.3.1 DT-AS . 14 6.3.2
8、 3-AS . 14 Annex A (normative): Data transmission during ringing 10 Data transmission prior to ringing . 11 Data transmission not associated with ringing 12 TAS physical characteristics 14 TE connected to the LE via a pair gain system - considerations for the Z interface . 15 Annex B (normative): DT
9、MF based subscriber line protocol . 16 Introduction 16 B . 1 B.2 Line seizure phase 16 B.3 Alerting phase 16 B.4 Information transfer phase 16 B.5 Tests . 17 Annex C (informative): Reference configurations . 18 Bibliography . 20 Annex D (informative): Data transmission format 19 History . 21 ETSI 4
10、ETSI EN 300 659-1 V1.3.1 (2001 -01) 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 non-members, and can be found in ETS
11、I SR O00 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 ClattD:/www.etsP.c/iDr. The attention of ETSI has been drawn
12、 to the Intellectual Property Rights (IPRs) listed below which are, or may be, or may become, Essential to the present document and, in particular, on-hook data transmission associated with ringing, network operator option: “transmission during ringing“. The IPR owner has undertaken to grant irrevoc
13、able licences, on fair, reasonable and non-discriminatory terms and conditions under these IPRs pursuant to the ETSI interim IPR Policy. Further details pertaining to these IPRs can be obtained directly from the IPR owner. The present IPR information has been submitted to ETSI and pursuant to the ET
14、SI 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 SR O00 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. IPRs: USA Ca
15、nada Belgium France United Kingdom Japan Netherlands Sweden Germany 4,582,956 1,225,726 O, 150,181 O, 150,181 O, 150,181 1,832,616 O, 150,181 O, 150,181 3,376,377 The related International Patent Application (WHO 85/00488) designated the following countries: AT, AU, BE, BR, CH, DE, DK, FI, FR, GB, J
16、P, LU, NL, NO, SE and SU. IPR owner: AT Part 2: “Off-hook data transmission“; Part 3: “Data link message and parameter codings“. National transposition dates Date of adoption of this EN Date of latest announcement of this EN (doa): Date of latest publication of new National Standard or endorsement o
17、f this EN (dop/e): Date of withdrawal of any conflicting National Standard (dow): 12 January 2001 30 April 2001 31 October 2001 31 October 2001 ETSI 6 ETSI EN 300 659-1 V1.3.1 (2001 -01) 1 Scope The present document specifies the subscriber line protocol for the support of PSTN display services at L
18、ocal Exchange (LE) in “on-hook state. The subscriber line protocol is accomplished by using asynchronous voice-band Frequency-Shift Keying (FSK) signalling. The data transmission specified in the present document is provided only in the direction from the LE to the TE. In addition, annex B is provid
19、ed in order to allow the continuation of use in those networks that already implemented a Dual Tone Multi-Frequency (DTMF) based subscriber line protocol. The requirements imposed on the FSK signalling-based subscriber line protocol deal with data encoding, data transmission requirements and the thr
20、ee layers of the protocol at the network side of the interface: presentation layer; data link layer; and physical layer. The requirements imposed on the DTMF-based subscriber line protocol deal with the transfer of the DTMF coded display information. The procedures and the encoding arrangements are
21、specified in annex B of the present document. Terminal Equipment (TE) can be connected by analogue access directly to the LE or through an Access Network (AN). In the latter case, data transmission can be applied from the LE or from elsewhere in the network hence a transmission path needs to exist f
22、rom the LE to the TE before data transmission. It is the network operators responsibility to ensure transmission path establishment. Transmission path establishment procedures are outside the scope of the present documen t. 2 References The following documents contain provisions which, through refer
23、ence in this text, constitute provisions of the present documen t. References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version a
24、pplies. A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same number. 111 ETSI TR 101 182: “Analogue Terminals and Access (ATA); Definitions, abbreviations and symbols“. 121 ETSI ETS 300 648 (1997): “Public Switched Telephone Network (PSTN
25、); Calling Line Identification Presentation (CLIP) supplementary service; Service description“. ETSI ES 201 235: “Specification of Dual Tones Multi-Frequency (DTMF) Transmitters and Receivers“, Part 1 to Part 4. 131 141 151 ITU-T Recommendation Q. 11 (1988): “Numbering plan for the international tel
26、ephone service“. ITU-T Recommendation T.50 (1992): “International Reference Alphabet (IRA) (Formerly International Alphabet No.5 or IA5) - Information technology - 7-bit coded character set for information interchange“. ITU-T Recommendation V.23 (1988): “600/1200-baud modem standardized for use in t
27、he general switched telephone network“. 161 ETSI 7 ETSI EN 300 659-1 V1.3.1 (2001 -01) 171 ETSI EN 300 659-3 (V1.3.1): “Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 3: Data link message and parameter codings“. 3 3.1 D
28、efinitions and abbreviations Def i n it ions For the purposes of the present document, the following terms and definitions apply: calling line identity: see ETS 300 648 2 graphic character: character that has a visual representation normally hand-written, printed or displayed; in IRA characters 2/1
29、to 7/14 (see ITU-T Recommendation T.50 5) long silent period: silent period between ring patterns loop state: see TR 101 182 i mark bit: symbol “1“ (see ITU-T Recommendation V.23 6) quiescent state: see TR 101 182 i ring pattern: consists of one or more ringing pulses separated by short silent perio
30、ds Ringing Pulse Alerting Signal (RP-AS): pulse of ringing current used to alert the TE that a data transmission will follow. Duration of RP-AS is specified in the present document ringing pulse: pulse of ringing current used for call arrival indication within a ring pattern. Ringing attributes (cur
31、rent values, duration of ringing pulses, number of ringing pulses in the ring patterns, cadence, etc.) are network specific short silent period: silent period between ringing pulses in a ring pattern space bit: symbol “O“ (see ITU-T Recommendation V.23 6) 3.2 Abbreviations For the purposes of the pr
32、esent document, the following abbreviations apply: AN AS CLIP DC DT-AS DTMF FSK IRA LE LR PSTN TAS TE LR+DT-AS RP-AS Access Network Alerting Signal Calling Line Identification Presentation Direct Current Dual Tone-Alerting Signal Dual Tone Multi-Frequency Frequency-Shift Keying International Referen
33、ce Alphabet Local Exchange Line Reversal Line Reversal followed by a Dual Tone-Alerting Signal Public Switched Telephone Network Ringing Pulse Alerting Signal TE Alerting Signal Terminal Equipment 4 Data encoding Data encoding shall be as described in EN 300 659-3 7. ETSI 8 ETSI EN 300 659-1 V1.3.1
34、(2001 -01) PARAMETER TYPE 5 PARAMETER PARAMETER PARAMETER PARAMETER PARAMETER LENGTH DATA TYPE LENGTH DATA OCTET(S) OCTET(S) Protocol requirements PARAMETER 1 Annex D gives an overview of the data transmission format. PARAMETER N 5.1 CHANNEL SEIZURE SIGNAL Presentation layer MARK MESSAGE MESSAGE PRE
35、SENTATION SIGNAL TYPE LENGTH LAYER CHECKSUM MESSAGE The Presentation layer specifies the formats and sequence of information that LE transmits to the TE (Presentation layer message). The Presentation layer message format is illustrated in figure 1. Figure 1 : Presentation layer message format Each p
36、arameter shall consist of a Parameter type, a Parameter length and Parameter octet(s). Parameter type (1 octet): shall contain an assigned binary encoded value to identify the Parameter. Parameter length (1 octet): shall contain the binary encoded number of Parameter octets that follow. Parameter da
37、ta octet): shall contain 1 or more (up to 253) octets. The value shall be either binary encoded or encoded in accordance with ITU-T Recommendation T.50 5. 5.2 Data Link layer The Data Link layer is responsible for providing bit error detection capability and for prepending the Channel Seizure Signal
38、 and the Mark Signal to the Presentation layer message. The Data Link layer message format shall be as illustrated in figure 2. Figure 2: Data Link message format Channel Seizure Signal: shall consist of a block of 300 continuous bits of alternating “0“s and “1“s. The first bit to be transmitted sha
39、ll be a “O“. The last bit to be transmitted shall be a “1“. It shall start the data transmission only in “on-hook data transmission. Mark Signal: shall either consist of a block of 180 f 25 mark bits or 80 f 25 mark bits. Message type (1 octet): shall contain an assigned binary encoded value to iden
40、tify the message. Message length (1 octet): shall contain the binary encoded number of octets of the Data Link layer message (not including the Message type, Message length and Checksum octets). This allows a presentation-layer message length between 3 and 255 octets. Presentation Layer Message: sha
41、ll contain at least one parameter. Checksum octet (1 octet): shall contain the twos complement of the modulo 256 sum of all the octets in the message starting from the Message type octet up to the end of the message (excluding the Checksum itself). ETSI 9 ETSI EN 300 659-1 V1.3.1 (2001 -01) Signal L
42、evel Signal Purity Source impedance The protocol does not support error correction or message retransmission. No sequence number or acknowledgement shall be used for the data messages transmitted from the LE to the TE. NOTE: a Data Link message, received by the TE, resulting in an incorrect checksum
43、 should be discarded by the TE. -14,5 dBV f 2,5 dB at the interface point Z, When the interface is terminated with the reference impedance ZR defined in TR 1 O1 182 l. Total voltage of all extraneous signal in the band 300 Hz-3 400 Hz at the interface point Z shall be at least 30 dB lower than the l
44、evel of the signal fundamental frequency. Network specific. 5.3 O Start bit Physical layer A BCDEFG H 1 20 21 22 23 24 25 26 27 (least significant) (most significant) Stop bit Physical layer requirements refer to the network end of the local loop (interface point Z, see annex C). Simplex asynchronou
45、s voiceband data transmission technique is used to transfer data to the TE. A frequency modulator is required in the LE and a demodulator in the TE. The frequency modulator shall meet 1 200 baud V.23 6 standard characteristics as specified in ITU-T Recommendation V.23 6 for the forward data transmis
46、sion channel. The transmission levels are described in table 1. Figure 3 - - - the order of bits transmitted to line is: Start bit first, Stop bit last; the octets are transmitted according to the growing order of their number: octet 1 first, octet 2 second, etc.; the data signal shall be continuous
47、. FSK modulation shall be applied only during transmission of data hence it shall be immediately stopped after the last bit of Data Link message has been transmitted. 6 Data transmission requirements: signalling, timing and tolerance Data transmission requirements refer to the network end of the loc
48、al loop (interface point Z, see annex C). Interface Z shall support data transmission to TE in either or both of the following modes: - - transmission is associated with ringing; transmission is not associated with ringing. The data transmission mode is service-dependant. ETSI 10 ETSI EN 300 659-1 V
49、1.3.1 (2001 -01) 6.1 Data transmission associated with ringing Two methods associated with ringing are defined to transmit information to the TE: - data transmission during ringing; - data transmission prior to ringing. It is a network operator option as to which method is used. 6.1 .I Data transmission during ringing Data transmission shall occur during the first long silent period between two ring patterns (see figure 4). The first long silent period shall be of sufficient duration for the data to be transmitted. The initial
