1、ETSI EN 300 248 1.2.1 (2001-07) European Standard (Telecommunications series) Access and Terminals (AT); 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface 2 ETSI EN 300 248 V1.2.1 (2001-07) Reference RENIAT-020003 Keywords access, digital, leased line, ONP, regulat
2、ion, term i nal, testing 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 Important notice Individual copies of
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6、a. O European Telecommunications Standards Institute 2001. All rights reserved. ETSI 3 ETSI EN 300 248 V1.2.1 (2001-07) Contents Intellectual Property Rights 5 Foreword 5 Introduction 6 1 Scope 7 2 References 7 3 Definitions 7 4 Abbreviations . 8 5 Requirements 8 5.1 Physical characteristics 8 5.1.1
7、 Hardwired connection 9 5.1.2 Alternative means of connection . 9 5.2 Electrical characteristics 9 5.2.1 output port 9 5.2.1.1 Signal coding 9 5.2.1.3 Clock accuracy . 10 Impedance towards ground . 11 5.2.1.5 Output jitter 11 Output return loss . 11 5.2.2 Input port . 11 5.2.2.1 Signal coding 11 Inp
8、ut return loss 12 Immunity against reflections . 12 Tolerable longitudinal voltages . 12 Impedance towards ground . 12 5.2.1.2 Waveform shape . 9 5.2.1.4 5.2.1.6 5.2.1.7 Output signal balance 11 5.2.2.2 5.2.2.3 5.2.2.4 5.2.2.5 5.2.2.6 5.2.2.7 Input jitter tolerance 13 5.2.2.8 Input clock tolerance .
9、 13 5.3 Safety 14 5.4 Overvoltage . 14 Test methods 15 General . 15 Input loss tolerance . 12 5.5 Electro-magnetic compatibility 14 Annex A (normative): A . 1 A . 1.1 A . 1.2 A.2 Test methods 16 A.2.1 A.2.2 A.2.3 A.2.4 A.2.5 A.2.6 A.2.7 A.2.8 Jitter 22 Additional information to support the test 15 E
10、quipment connection . 15 Signal coding at output port . 16 Waveform shape at output port 16 Clock accuracy at the output port . 17 Return loss at input port . 18 Input loss tolerance and immunity against reflections . 18 Tolerable longitudinal voltage and HDB3 input coding 20 Impedance towards growi
11、d 21 Annex B (normative): B . 1 Definition of HDB3 code 24 General . 24 B.2 Definition . 24 ETSI 4 ETSI EN 300 248 V1.2.1 (2001-07) Annex C (informative): Bibliography . 25 History . 26 ETSI 5 ETSI EN 300 248 V1.2.1 (2001-07) Intellectual Property Rights IPRs essential or potentially essential to th
12、e 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 14: “Intellectual Property Rights (IPRs); Essential, orpotentially Essential, IPRs notjed to ETSI i
13、n 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, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existenc
14、e 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 (Telecommunications series) has been produced by ETSI Technical Committee Access and Terminals (AT). The
15、present document results from a mandate from the European Commission to provide European standards for the support of the 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
16、 (AT); 2 048 kbit/s digital unstructured and structured leased lines (D2048U and D2048S); Network interface presentation“; - EN 300 247: “Access and Terminals (AT); 2 048kbit/s digital unstructured lease line (D2048U); Connection characteristics“. The present document is based on information from IT
17、U-T Recommendations and ETSI publications and the relevant documents are quoted where appropriate. 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 of this EN (dop/e): Date of wi
18、thdrawal of any conflicting National Standard (dow): 29 June 2001 30 September 2001 31 March 2002 31 March 2002 ETSI 6 ETSI EN 300 248 V1.2.1 (2001-07) Introduction The Council Directive on the application of Open Network Provision (ONP) to leased lines (92/44/EEC), concerns the harmonization of con
19、ditions for open and efficient access to, and use of, the leased lines provided on public telecommunications networks and the availability throughout the Community (EC) of a minimum set of leased lines with harmonized technical characteristics. The consequence of the Directive is that Telecommunicat
20、ions Organizations within the EC shall make available a set of leased lines between points in these countries with specified connection characteristics and specified interfaces. EN 300 166 and ITU-T Recommendation G.703 i were used as the basis for the terminal interface. Two categories (voluntary a
21、nd regulatory) of standard were used for the interfaces of terminal equipment designed for connection to the ONP leased lines. Technical Basis for Regulations (TBRs) gave the earlier essential requirements under the Directive 91/263/EEC, later replaced by 98/13/EC, for attachment to the leased lines
22、, whereas other voluntary standards (ETSs or ENS) gave the full technical specifications for these interfaces. This document, which is based on an earlier ETS, belongs to the second category. The requirements of TBR 12 are a subset of the present document. The present version of the present document
23、 has been produced to introduce some necessary changes. ETSI 7 ETSI EN 300 248 V1.2.1 (2001-07) 1 Scope The present document specifies the physical and electrical characteristics (except safety, overvoltage and EMC aspects) and corresponding test principles for a terminal equipment interface for con
24、nection to the network termination points of ONP 2 048 kbit/s digital unstructured leased lines using 120 i2 interfaces. The present document is to ensure that the interface of the terminal equipment is compatible with the ONP 2 048 kbit/s digital unstructured leased line. It is applicable to all in
25、terfaces designed for connection to the leased line, however in the cases of apparatus that carries a particular service, of complex apparatus and of apparatus in private networks, other requirements may apply in addition to the present document. Customer premises wiring and installation between the
26、 terminal equipment and the Network Termination Point (NTP) are outside the scope of the present document. 2 Re fe re nces The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (identified by da
27、te 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 applies. il ITU-T Recommendation G.703 (1998): “Physical/electrical characteristics of hierarchical digital interfac
28、es“. Pl ITU-T Recommendation O. 15 1 (1992): “Error performance measuring equipment operating at the primary rate and above“. 3 Definitions For the purposes of the present document, the following terms and definitions apply: Leased lines: telecommunications facilities provided by a public telecommun
29、ications network that provide defined transmission 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
30、which form part of the public telecommunications network and are necessary for access to, and efficient communication through, that public network Terminal Equipment (TE): equipment intended to be connected to the public telecommunications network, i.e.: a) to be connected directly to the terminatio
31、n of a public telecommunications network; or b) 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. ETSI 8 ETSI EN 300 248 V1.2.1 (2001-07) 4 Abbrevi
32、ations For the purposes of the present document, the following abbreviations apply: D2048U DC EMC HDB3 NTP ONP PPm pms(215-1) mis Rx SDH TE TX UI 2 048 kbith digital unstructured ONP leased line Direct Current Electro-Magnetic Compatibility High Density Bipolar code of order 3 (see annex B) Network
33、Termination Point Open Network Provision parts per million Pseudo Random Bit Sequence (as defined in clause 2.1 of ITU-T Recommendation O. 15 1 2) root mean square Receive (a signal input at either the terminal equipment interface or the test equipment) Synchronous Digital Hierarchy Terminal Equipme
34、nt Transmit (a signal output at either the terminal equipment interface or the test equipment) Unit Interval 5 Requirements The 2 048 kbith unstructured leased line provides a bidirectional point-to-point digital leased line with a usable bit rate of 2 048 kbith where timing is not provided from the
35、 network. The provision of circuit timing is the responsibility of the user. No structuring of the data is provided by the network and any structuring is the responsibility of the user. 5.1 Physical characteristics Currently no standardized connector is readily available. Consequently, the only meth
36、od of connection that can be specified in the present document is the use of solid conductors of 0,4 mm to 0,6 mm. The present document requires the TE to be capable of presenting either a point for the attachment of unterminated solid conductors, or solid conductors themselves (see clause 5.1.1). I
37、t is a requirement that such a connection method be available to be provided for use with the TE if necessary. In order to allow connection to be made using other methods (e.g. connectors), the TE is permitted to be supplied with a connection method suitable for use with those methods (see clause 5.
38、1.2). NOTE 1 : The following are examples of arrangements that comply with the requirements. The list below should not be regarded as an exhaustive list of all permitted arrangements: a) a cord, permanently connected to the terminal equipment at one end and unterminated at the other end, with wires
39、that are solid conductors with diameters in the range 0,4 mm to 0,6 mm; b) a cord, connected via a plug and socket to the terminal equipment at one end and unterminated at the other end, with wires that are solid conductors with diameters in the range 0,4 mm to 0,6 mm; c) an insulation displacement
40、connector, designed to accept wires with solid conductors with diameters in the range 0,4 mm to 0,6 mm, but with no cord; d) a screw connector, designed to accept wires with solid conductors with diameters in the range 0,4 mm to 0,6 mm, but with no cord; e) the arrangement in b) plus one or more add
41、itional alternative cords with the same plug or socket arrangement at the terminal end and any plug or socket at the other end; f) the arrangement in c) or d) plus one or more cords suitable for connection to the terminal equipment at one end and any plug or socket at the other end. The transmit pai
42、r is the output from the terminal equipment interface. The receive pair is the input to the terminal equipment interface, as shown in figure 1. Where the terms “output“ and “input“ are used without qualification in the present document, they refer to the terminal equipment interface. ETSI 9 Pulse sh
43、ape (nominally rectangular) Test load impedance Peak voltage of a space Nominal pulse width Ratio of the amplitudes of positive and negative pulses at the centre of the pulse interval Ratio of the widths of positive and negative pulses at the nominal half amplitude Nominal peak voltage V of a mark E
44、TSI EN 300 248 V1.2.1 (2001-07) All marks of a valid signal shall conform with the mask (see figure 2) irrespective of the polarity. The value V corresponds to the nominal peak voltage of a mark. 120 i2 non-reactive 3v O f 0,3 V 244 ns 0,95 to 1,05 0,95 to 1,05 INTERFACE EQUIPMENT INPUT OUTPUT Figur
45、e 1 NOTE 2: The use of a shielded cord or cable may be necessary to meet radiation and immunity requirements defined in ElectroMagnetic Compatibility (EMC) standards. 5.1 .I Hardwi red connection Requirement: The terminal equipment shall provide: a) a set of connection contacts (e.g. an insulation d
46、isplacement connector or a screw terminal block) to which solid wire conductors with diameters in the range 0,4 mm to 0,6 mm may be connected; or b) a wiring arrangement connected by any means to the terminal equipment, with unterminated solid wire conductors with diameters in the range 0,4 mm to 0,
47、6 mm at the end distant from the terminal equipment. Test: There is no test. All subsequent tests are carried out via the specified connection method. 5.1.2 Alternative means of connection Any alternative means of connection may be provided in addition to the connection arrangements under clause 5.1
48、.1. 5.2 E I ect ri cal characteristics 5.2.1 Output port 5.2.1.1 Signal coding Requirement: Coding of the digital signal transmitted at the output port shall be in accordance with High Density Bipolar code of order 3 (HDB3) encoding rules (see annex B). Test: The test shall be conducted according to
49、 annex A, clause A.2.1. 5.2.1.2 Waveform shape Requirement: The pulse at the output port shall comply with the requirements given in table 1 and figure 2, based on ITU-T Recommendation G.703 i. Test: The test shall be conducted according to annex A, clause A.2.2. ETSI 10 ETSI EN 300 248 V1.2.1 (2001-07) =I 00% 50% 0% (244 - 25) pulse 488 ns (244 + 244) Figure 2: Pulse mask for 2 048 kbis pulse 5.2.1.3 Clock accuracy Requirement: Where a Terminal Equipment (TE) has an internal clock, in the absence of any external reference signal timing, the output port shall have a bit
