1、ETSI EN 300 41 8 1.2.1 (2001-07) European Standard (Telecommunications series) Access and Terminals (AT); 2 048 kbit/s digital unstructured and structured leased lines (D2048U and D2048S); Network interface presentation 2 ETSI EN 300 418 V1.2.1 (2001-07) Reference RENIAT-020006 Keywords digital, int
2、erface, leased line, network, ONP, terminal, testing, UNI 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 O0017 - NAF 742 C Association but non lucratif enregistre la Sous-prfecture de Grasse (06) No 7803/88 Impo
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6、tend to reproduction in all media. O European Telecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI EN 300 418 V1.2.1 (2001-07) Contents Intellectual Property Rights 5 Foreword 5 Introduction 6 1 Scope 7 2 References 7 3 Definitions and abbreviations 8 3.1 Definitions 8 3.2 A
7、bbreviations 8 4 Reauirements 8 4.1 4.1.1 4.1.2 4.1.3 4.2 4.2.1 4.2.1.1 4.2.1.2 4.2.1.3 4.2.1.4 4.2.1.5 4.2.1.6 4.2.1.7 4.2.2 4.2.2.1 4.2.2.2 4.2.2.3 4.2.2.4 4.2.2.5 4.2.2.6 4.2.2.7 4.3 4.4 4.5 Physical characteristics 9 Hardwired connection 9 Socket specification . 9 Shield connection point 9 Elect
8、rical characteristics 10 output port 10 Waveform shape . 10 Output timing under failure conditions 11 Output return loss . 12 Output timing and jitter . 12 Input return loss 12 Immunity against reflections . 13 Tolerable longitudinal voltages . 13 Signal coding 10 Impedance towards ground . 12 Outpu
9、t signal balance 12 Input port . 12 Signal coding 12 Input loss tolerance . 13 Impedance towards ground . 13 Input timing and jitter tolerance 13 Safety 14 Overvoltage . 14 ElectroMagnetic Compatibility (EMC) 14 Annex A (normative): Test methods 15 General . 15 Additional information to support the
10、test 15 Equipment connection . 15 A . 1 A . 1.1 A . 1.2 A . 2 A.2.1 A.2.2 A.2.3 A.2.4 A.2.5 A.2.6 A.2.7 Test methods 16 Signal coding at output port . 16 Waveform shape at output port 17 Input loss tolerance and immunity against reflections . 18 Tolerable longitudinal voltage and HDB3 input coding 2
11、0 Impedance towards ground 21 Output timing under failure conditions . 21 Return loss at input port . 18 Annex B (normative): Definition of HDB3 code 23 B . 1 General . 23 B.2 Definition . 23 ETSI 4 ETSI EN 300 418 V1.2.1 (2001-07) Annex C (informative): Bibliography . 24 History . 25 ETSI 5 ETSI EN
12、 300 418 V1.2.1 (2001-07) 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 ETSI SR O00 3
13、 14: “Intellectual Property Rights (IPRs); Essential, orpotentially Essential, IPRs notjed to ETSI in respect OfETSIstandards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (htt:/!wvw.etsi ordj r). Pursuant to the ETSI IPR Policy, no investigation
14、, 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 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 European Standard (Tele
15、communications series) has been produced by ETSI Technical Committee Access and Terminals (AT). The present document resulted from a mandate from the Commission of the European Community (CEC) to provide standards for the support of the Directive on Open Network Provision (ONP) of leased lines (92/4
16、4/EEC). In the case of the unstructured leased line, the present document supersedes ETS 300 246 (withdrawn) (see annex C). There are four other standards directly related to the present document: - EN 300 247: “Access and Terminals (AT); 2 048kbit/s digital unstructured lease line (D2048U); Connect
17、ion characteristics“; EN 300 248: “Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface“; EN 300 419: “Access and Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Connection characteristics“; - - - EN 300 420: “Access a
18、nd Terminals (AT); 2 048 kbit/s digital structured leased lines (D2048S); Terminal equipment interface“. The present document is based on information from ITU-T Recommendations and ETSI publications and the relevant documents are quoted where appropriate. National transposition dates Date of adoptio
19、n of this EN: Date of latest announcement of this EN (doa): Date of latest publication of new National Standard or endorsement of this EN (dop/e): Date of withdrawal of any conflicting National Standard (dow): 29 June 2001 30 September 2001 31 March 2002 31 March 2002 ETSI 6 ETSI EN 300 418 V1.2.1 (
20、2001-07) Introduction The Council Directive on the application of ONP to leased lines (92/44/EEC) (see annex C) concerns the harmonization of conditions for open and efficient access to, and use of, the leased lines provided over public telecommunications networks, and the availability throughout th
21、e European Union (EU) of a minimum set of leased lines with harmonized technical characteristics. The consequence of the Directive is that telecommunications organizations within the EU shall make available a set of leased lines between points in these countries with specified connection characteris
22、tics and specified interfaces. Under the Directive 91/263/EEC (see annex C), later replaced by 98/13/EC (see annex C), terminal equipment for connection to these leased lines was required to fulfil certain essential requirements. The present version of the present document has been produced to intro
23、duce some necessary changes. ETS 300 166 (see annex C) and ITU-T Recommendation G.703 i were used as the basis for the network interface presentation requirements. ETSI 7 ETSI EN 300 418 V1.2.1 (2001-07) 1 Scope The present document specifies the technical requirements and test principles for the ne
24、twork interface presentations of ONP 2 048 kbit/s digital leased lines using 120 i2 interfaces. This includes: - - the 2 048 kbith digital unstructured leased line; and the 2 048 kbith digital structured leased line with an information transfer rate of 1 984 kbit/s without restriction on binary cont
25、ent. A connection is presented via interfaces at Network Termination Points (NTP). The present document defines the network interface as presented by the leased line provider and should be used in conjunction with the appropriate companion standard, EN 300 247 3 or EN 300 419 5 , specifiing the conn
26、ection characteristics between the NTPs of the leased line. The present document and the appropriate connection characteristics standard together describe the technical characteristics of the leased line. The present document is applicable to leased lines, including part time leased lines, for which
27、 the establishment or release do not require any protocol exchange or other intervention at the NTP. The present document covers the physical, mechanical and electrical characteristics (except safety, overvoltage and EMC aspects) of the network interface and specifies the conformance tests for equip
28、ment of the kind that provides the interface presentation. Some of the tests described in the present document are not designed to be applied to the interface of an installed leased line; such tests may be applied to equipment of the kind used to provide the interface. The present document does not
29、include details concerning the implementation of the tests nor does it include information on any regulations concerning testing. There is no requirement for each leased line to be tested in accordance with the present document before it is brought into, or returned into, service. 2 Re fe re nces Th
30、e 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, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do n
31、ot apply. For a non-specific reference, the latest version applies. il ITU-T Recommendation G.703 (1998): “Physical/electrical characteristics of hierarchical digital interfaces“. Pl ITU-T Recommendation O. 15 1 (1992): “Error performance measuring equipment operating at the primary rate and above“.
32、 ETSI EN 300 247: “Access and Terminals (AT); 2 048kbit/s digital unstructured lease line (D2048U); Connection characteristics“. ETSI EN 300 248: “Access and Terminals (AT); 2 048 kbith digital unstructured leased line (D2048U) Terminal equipment interface“. ETSI EN 300 419: “Access and Terminals (A
33、T); 2 048 kbith digital structured leased lines (D2048S); Connection characteristics“. ETSI EN 300 420: “Access and Terminals (AT); 2 048 kbith digital structured leased lines (D2048S); Terminal equipment interface“. 31 41 51 61 ETSI 8 ETSI EN 300 418 V1.2.1 (2001-07) 3 Definitions and abbreviations
34、 3.1 Defi nit ions For the purposes of the present document, the following terms and definitions apply: leased lines: telecommunications facilities provided by a public telecommunications network that provide defined transmission characteristics between NTPs and that do not include switching functio
35、ns that the user can control, (e.g. on-demand switching) Network Termination Point (NTP): all physical connections and their technical access specifications which form part of the public telecommunications network and are necessary for access to and efficient communication through that public networ
36、k PRBS(215-l): Pseudo Random Bit Sequence (PRBS) (as defined in clause 2.1 of ITU-T Recommendation O. 15 1 2) terminal equipment: equipment intended to be connected to the public telecommunications network, i.e.: - - to be connected directly to the termination of a public telecommunication network;
37、or to interwork with a public telecommunications network being connected directly or indirectly to the termination of a public telecommunications network, in order to send, process, or receive information 3.2 Ab brevi at ions For the purposes of the present document, the following abbreviations appl
38、y: AIS AMI D2048S D2048U dc EMC HDB3 ISDN NTP ONP PPm PRBS Rx TX CRC-4 mis Alm Indication Signal Alternate Mark Inversion Cyclic Redundancy Check-4 bit 2 048 kbit/s digital structured leased line 2 048 kbith digital unstructured leased line direct current ElectroMagnetic Compatibility High Density B
39、ipolar code of order 3 (see annex B) Integrated Services Digital Network Network Termination Point Open Network Provision parts per million Pseudo Random Bit Sequence root mean square Rx is a signal input (at either the leased line interface or the test equipment, see figure 1) TX is a signal output
40、 (at either the leased line interface or the test equipment, see figure 1) 4 Requirements These requirements define the network interface presentation for: - the 2 048 kbith digital unstructured leased line (D2048U) which provides a bidirectional point-to-point digital connection with a usable bit r
41、ate of 2 048 kbit/s where timing is not provided from the network. The provision of circuit timing is the responsibility of the user. No structuring of the data is provided, or shall be required, by the network and any structuring is the responsibility of the user; and the 2 048 kbith digital struct
42、ured leased line (D2048S) which provides a bidirectional point-to-point digital connection with an information transfer rate of 1 984 kbith without restriction on binary content. The frame structure in the 2 048 kbith bit stream is defined in EN 300 419 5. Any structuring of the data within the tran
43、sparent 1 984 kbith part of the frame is the responsibility of the user. - ETSI 9 ETSI EN 300 418 V1.2.1 (2001-07) NOTE 1 : The network interface is not designed for power feeding. NOTE 2: If equipment providing the interface requires a mains supply, the leased line provider should bring this to the
44、 attention of the user so that the user can provide mains supply back-up facilities, if required. 4.1 Physical characteristics The connection arrangements provided by the leased line interface shall be suitable for hardwired connection (see clause 4.1.1); however, with the agreement of the user, an
45、alternative means of connection, using a socket, may be provided (see clause 4.1.2). The transmit pair is the output fiom the network interface. The receive pair is the input to the network interface, as shown in figure 1. Where the terms “output“ and “input“ are used without qualification in the pr
46、esent document, they refer to the network interface. 1 output Input i: Input output Network I n terface RX RX Term i na1 Equipment TX Figure 1 The use on the terminal equipment side of the interface of shielded cables may be necessary to meet radiation and immunity requirements defined in ElectroMag
47、netic Compatibility (EMC) standards. Therefore the NTP is required to provide a point for connection of the shield (see clause 4.1.3). 4.1 .I Hardwi red connection Requirement: Where the leased line is being presented as a hardwired connection, the leased line interface shall provide a means of term
48、inating wire with solid conductors having diameters in the range 0,4 mm to 0,6 mm. The leased line provider shall provide information on the configuration of the means of connection. Test: There is no test. All subsequent tests are carried out via the specified connection method. 4.1.2 Socket specif
49、ication There is no constraint on the type of socket that may be used under the present document. NOTE: The intention is to spec the same socket as is specified for Integrated Services Digital Network (ISDN) primary rate access; however this approach is not practicable at present since connectors conforming to ISO/IEC 10173 (see annex C) are not available. A requirement to use the ISDN primary rate socket may be added to the present document when such connectors are readily available. 4.1.3 Shield connection point Requirement: The NTP shall provide a point, or p
