1、ETSI EN 300 247 1.2.1 (2001-07) European Standard (Telecommunications series) Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Connection characteristics 2 ETSI EN 300 247 V1.2.1 (2001-07) Reference RENIAT-020017 Keywords access, digital, leased line, ONP ETSI 650 R
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5、vailable at If you find errors in the present document, send your comment to: editoretsi .fr Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. O European Telecommunications Sta
6、ndards Institute 2001. All rights reserved. ETSI 3 ETSI EN 300 247 V1.2.1 (2001-07) Contents Intellectual Property Rights 4 Foreword 4 Introduction 5 1 2 3 3.1 3.2 4 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.7 Scope 6 References 6 Definitions and abbreviations 7 Definitions 7 Abbreviations 7 Requi
7、rements 8 Attributes 8 Information transfer rate . 9 Information transfer susceptance 9 Structure 9 Establishment of communication 9 Communication configuration 9 Symmetry 9 Network performance . 9 4.1.7.1 4.1.7.2 4.1.7.2.1 4.1.7.2.2 4.1.7.3 4.1.7.4 4.1.7.4.1 4.1.7.4.2 4.1.7.4.3 Transmission delay .
8、 9 Jitter . 10 Jitter tolerance at the network input port 10 Maximum jitter at the network output port . 11 Slip 11 Error . 11 Errored seconds . 11 Severely errored seconds . 11 Background block errors 12 Annex A (normative): A . 1 A . 1.1 A.1.2 Sequence of performing the tests . 13 A.2 Test methods
9、 13 A.2.1 Information transfer rate, susceptance, structure and symmetry 13 A.2.3 Jitter 15 A.2.4 Error and slip 16 Annex B (informative): Reduction of the measuring period for error 18 B . 1 Introduction 18 B.2 Explanation 18 Annex C (informative): Bibliography . 21 History . 22 Test methods 13 Gen
10、eral . 13 Equipment connection . 13 A.2.2 Delay 14 ETSI 4 ETSI EN 300 247 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 fo
11、r ETSI members and non-members, and can be found in ETSI SR O00 3 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:/!wv
12、w.etsi ordj r). 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 referenced in ETSI SR O00 3 14 (or the updates on the ETSI Web server) which are, or may be, or may become, essenti
13、al to the present document. Foreword This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Access and Terminals (AT). The present document results from a mandate from the Commission of the European Community (CEC) to provide standards for the support of the
14、 Directive on Open Network Provision (ONP) of leased lines (92/44/EEC). There are two other standards directly related to the present document: - EN 300 418: “Access and Terminals (AT); 2 048 kbit/s digital unstructured and structured leased lines (D2048U and D2048S); Network interface presentation“
15、; - EN 300 248: “Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U) 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 transposit
16、ion 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 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 5
17、 ETSI EN 300 247 V1.2.1 (2001-07) Introduction The Council Directive on the application of Open Network Provision (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 on public telecommunicat
18、ions networks and the availability throughout the Community (EEC) of a minimum set of leased lines with harmonized technical characteristics. The consequence of the Directive is that Telecommunications Organizations within the EEC shall make available a set of leased lines between points in these co
19、untries with specified connection characteristics 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 th
20、e present document has been produced to introduce some necessary changes. ITU-T Recommendation 1.340 (see annex C) for ISDN connection types was used as a basis for the connection characteristics. ETSI 6 ETSI EN 300 247 V1.2.1 (2001-07) 1 Scope The present document specifies the technical requiremen
21、ts and test principles for connection characteristics of ONP 2 048 kbit/s digital unstructured leased lines. A connection is presented via interfaces at Network Termination Points (NTP) and includes any equipment that may provide the NTP. Signals between terminal equipments are subject to impairment
22、s during their transfer over the connection. The limits to these impairments are stated in the present document. Together with the companion standard, EN 300 418 3 defining the interface presentation, the present document describes the service offered. The leased line provides access to the full dig
23、ital bit rate of 2 048 kbith with no restrictions on the binary content. The tests specified in the present document cannot be carried out, nor can the performance be monitored by the leased line provider, while the leased line is in service, i.e. carrying users traffic. Thus the tests are designed
24、for bringing into and returning into service, although there is no obligation to perform these tests each time a leased line is brought into or returned into service. The present document is applicable to leased lines, including part time leased lines, for which the establishment or release do not r
25、equire any protocol exchange or other intervention at the NTP. The present document specifies the compliance tests for the connection requirements. The present document does not include details concerning the implementation of the tests, nor does it include information on any relevant regulations. T
26、he present document describes those characteristics of the connection that cannot be determined only by the equipment providing the NTPs. The related standard EN 300 41 8 3 defines the interface presentation and places no fwther constraints on the connection. 2 Re fe re nces The following documents
27、contain provisions which, through reference in this text, constitute provisions of 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-s
28、pecific reference, the latest version applies. il ITU-T Recommendation O. 15 1 (1992): “Error performance measuring equipment operating at the primary bit rate and above“. ITU-T Recommendation O. 153 (1992): “Basic parameters for the measurement of error performance at bit rates below the primary ra
29、te“. ETSI EN 300 418: “Access and Terminals (AT); 2 048 kbith digital unstructured and structured leased lines (D2048U and D2048S); Network interface presentation“. ETSI EN 300 248: “Access and Terminals (AT); 2 048 kbith digital unstructured leased line (D2048U) Terminal equipment interface“. Pl 31
30、 41 ETSI 7 ETSI EN 300 247 V1.2.1 (2001-07) 3 Definitions and abbreviations 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 transmis
31、sion characteristics between network termination points and that do not include switching functions 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 telecommunicatio
32、ns network and are necessary for access to, and efficient communication through, that public network unavailability period: period of time beginning at the first of 1 O consecutive severely errored seconds and ending immediately before the first following period of 1 O consecutive seconds none of wh
33、ich are severely errored errored block: block with one or more bit errors (see ITU-T Recommendation G.826 (see annex C) NOTE: The duration of a block is 1 millisecond. errored second: one-second period with one or more errored blocks (see ITU-T Recommendation G.826 (see annex C) severely disturbed p
34、eriod: occurs when, over a minimum period of time equivalent to four contiguous blocks, either all the contiguous blocks are affected by a high binary error density of at least 1 O-2, or a loss of signal information is observed (see ITU-T Recommendation G.826 (see annex C) severely errored second: o
35、ne-second period which contains at least 30 % errored blocks or at least one severely disturbed period (see ITU-T Recommendation G.826 (see annex C) slip: sequence of one or more extra or missing consecutive unit intervals in the bit stream errored seconds ratio: ratio of errored seconds over all se
36、conds within a specified measuring period, where neither are counted during unavailability periods (see ITU-T Recommendation G.826 (see annex C) severely errored seconds ratio: ratio of severely errored seconds over all seconds within a specified measuring period, where neither are counted during un
37、availability periods (see ITU-T Recommendation G.826 (see annex C) background block error ratio: ratio of errored blocks over all blocks within a specified measuring period, where neither are counted during unavailability periods nor during severely errored seconds (see ITU-T Recommendation G.826 (s
38、ee annex C) satellite transmission: transmission via an earth orbiting satellite 3.2 Ab brevi at ions For the purposes of the present document, the following abbreviations apply: D2048U ONP NTP PPm pms(29 - i) pms(215 - i) Rx TX UI 2 048 kbith digital unstructured ONP leased line Open Network Provis
39、ion Network Termination Point parts per million Pseudo Random Bit Sequence (as defined in clause 2.1 of ITU-T Recommendation 0.153 2) Pseudo Random Bit Sequence (as defined in clause 2.1 of ITU-T Recommendation O. 15 1 i) Receive (a signal input at either the leased line interface or the test equipm
40、ent) Transmit (a signal output at either the leased line interface or the test equipment) Unit Interval ETSI 8 ETSI EN 300 247 V1.2.1 (2001-07) Time interval with errored blocks Description Errored seconds Severely errored seconds Background block errors 4 Value Nature Reference clause 2 889 per 24
41、hour period 11 7 per 24 hour period 22 395 per 24 hour period See 5.1.7.4.1 See 5.1.7.4.2 See 5.1.7.4.3 Requirements The performance of the leased line shall comply with these requirements only if the conditions of supply of the network equipment providing the NTP are met, (e.g. if the equipment is
42、connected to an appropriate power supply on the customers premises). The ITU-T attribute technique is used to express the connection requirements. The following attributes from ITU-T Recommendation I. 140 (see annex C) are specified in the present document: - information transfer rate; - information
43、 transfer susceptance; - structure; - establishment of communication; - symmetry; - communication configuration; - network performance. NOTE: “Bit rate“ is equivalent to “information transfer rate“ in the present document. The following network performance sub-attributes are considered relevant for
44、the present document: - transmission delay; - jitter; - slip; - error. 4.1 Attributes The connection attributes are displayed in table 1. In effect, these attributes define the service being offered. The values and the associated compliance tests can be found in the subsequent clauses. Table 1 : Con
45、nection attributes I Error Darameters I ETSI 9 ETSI EN 300 247 V1.2.1 (2001-07) 4.1 .I I nfo rm atio n transfer rate Requirement: The connection shall be capable of transferring an information rate of 2 048 kbith f 50 ppm. Test: The test shall be conducted according to clause A.2.1. 4.1.2 Informatio
46、n transfer susceptance Requirement: The connection shall be capable of transferring unrestricted digital information. Test: The test shall be conducted according to clause A.2.1. 4.1.3 Structure Requirement: The connection shall be unstructured. The full bit rate of 2 048 kbith shall be available to
47、 the user for unrestricted digital information transfer. Test: The test shall be conducted according to clause A.2.1. 4.1.4 Establishment of communication Requirement: Establishment or release of the connection shall not require any protocol exchange or other intervention at the NTP by the user. Tes
48、t: By declaration. 4.1.5 Symmetry Requirement: The connection shall be symmetrical, i.e. each direction of transmission shall have the same nominal characteristics, although the actual values shall be independent. Test: The test shall be conducted according to clause A.2.1. 4.1.6 Communication confi
49、guration Requirement: The connection configuration shall be point-to-point. Test: By declaration. 4.1.7 Network performance The network performance sub-attributes are displayed in table 1. The values and the associated compliance tests can be found in the subsequent clauses. 4.1.7.1 Transmission del ay Requirement: The requirement depends upon whether satellite transmission is involved in the connection or not: a) for connections where satellite transmission is not involved the one way end-to-end delay shall be less than (1 O + 0,O 1 G) ms, where G is the ge
