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ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.2.1 Backup | A backup facility should be provided that would be able to take over the complete function of the relay service in case of system failure. A backup power supply should be provided, sufficient to operate at full capacity for a minimum of 12 hours after a power failure. Such supply should support at least the switching s... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.2.2 Disaster recovery plan | A complete plan should exist for dealing with all types of natural or man made problems likely to cause failure of the service. The plan should detail the level of escalation that should be employed to deal with the problem and restore service. The plan should be designed to ensure that no aspect of relay service is si... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.2.3 Fault messages | Appropriate fault messages should be provided in the event of any system failure. They should be provided in appropriate form for all users of the service. ETSI ETSI TR 101 806 V1.1.1 (2000-06) 16 |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.3 Traffic | |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.3.1 Traffic recording | Records should be kept of the supply time for the provision of the service, fault rate, fault repair time, unsuccessful call ratio, time to answer, call set up time and billing complaints. Records should also be kept of the number of subscribers, the number of calls handled (split into types of call handled) and the av... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.3.2 Traffic standards | |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.3.2.1 Text relay services | The service should be available on demand 24 hours a day every day of the year. The average time to answer should be less than 7 seconds. The delay on reaching the relay service should not exceed 20 seconds for at least 90 % of all calls between 07.00 a.m. and 22.00 p.m. Outside this period of the delay shall not excee... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.3.2.2 Spoken to spoken and videophone relay services | The service should be available from 8 a.m. till 8 p.m. from Monday to Friday every week of the year. The average time to answer should be less than 12 seconds. The delay on answering should not exceed 40 seconds for at least 90 % of all calls. For the remaining 10 % of the calls the maximum delay shall not exceed more... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.4 Transmission quality | The relay service should meet normal standards of network speech transmission quality for circuit loss, delay and noise. ETSI ETSI TR 101 806 V1.1.1 (2000-06) 17 |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.5 Quality assurance | |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.5.1 The quality organization | The provider should have effective control of the quality of the service. The quality organization should be documented. The quality control of the service should be delegated to a manager independent of the manager responsible for the day to day running of the service. The responsibility includes an evaluation of qual... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.5.2 Quality assurance program | The quality assurance programme, should meet the requirements of ISO 9000 [4]. The provider is responsible for ensuring that the service fulfils the demands specified by the relevant authorities. Deviations from the program may not occur without a separate agreement with the relevant authority. |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.5.3 Presentation of the quality assurance program | The quality assurance program should contain a description of the functions in the service that the provider should perform. The quality assurance program should be based on demands set by the relevant authority. The program should also include a description of work assignments and areas of responsibility within the se... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.6 Operator Training requirements | The provider of the relay service has the responsibility for educating all staff so that all conversions remain ethical. The provider of the relay service should make sure that the staff working with communication is sufficiently well trained to effectively meet the specialized communication needs of individuals using ... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.7 Operator proficiency requirements | Before being permitted to handle any call any operator shall possess the following skills and abilities: - a typing speed of at least 40 words per minute; - proficiency in national language skills; - proficiency in national grammar skills; - the ability to understand users with limited language skills and to convert th... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 7.8 Operator counselling | Counselling facilities should be provided to assist operators to deal with emotional aspects of relaying calls. The counselling support system should be confidential. |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 8 Charges | The user should pay rates no greater than the rates paid for calls made without consulting the relay services. The rates for a conversion between the relay service and the subscriber should be cost-free. In a case where the calling subscriber desires an additional service offered by the relay service, the rate charged ... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 9 Complaints handling | The service provider should establish procedures to deal with complaints, enquiries and comments about the relay service and its personnel. All such complaints, enquiries and comments should be recorded and dealt with by a supervisor or customer service representative. The procedure should be described in appropriate p... |
ad21e34e94ca440f3baba4566b726a90 | 101 806 | 10 User information | The relay provider should inform the user about the service. This includes information about the service, the extent of the service, a user guide and all information about changes. Information to the user should give full consideration to the users disabilities and problems with reading printed text. The relay provider... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 1 Scope | The present document assists the public network operators and public service providers in producing publications that describe their public interfaces in accordance with article 4.2 of Directive 1999/5/EC [1]. The present document lists the characteristics of a non-radio digital interface to the public telecommunicatio... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 2 References | For the purposes of this Technical Report (TR) the following references apply: [1] Directive 1999/5/EC of the European Parliament and of the Council of 9 March 1999 on radio and equipment and telecommunications terminal equipment and the mutual recognition of their conformity (R&TTE Directive). [2] ETSI TR 101 092 (V1.... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 3 Definitions and abbreviations | |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: direct access: access for terminal equipment to services provided by a PNO or PSP exclusively via the infrastructure of that PNO or PSP indirect access: access for terminal equipment to services provided by a PNO or PSP via the infrast... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 3.2 Abbreviations | For the purposes of the present document, the following abbreviations apply: AHGC Ad hoc group C, one of the groups set up by the European Commission to preliminarily study the implementation of Directive 99/5/EC [1], group C was given the task of studying the operator's obligation to publish interface specifications u... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 5 Applicability of parameters to interface types. | Annex A contains an extract from the final report of Ad-Hoc Group C as presented to TCAM in July 1999 by the European Commission. (The group C report was used by the Commission in deriving guidance documents on interface publication [4], [5]). From Annex A the following can be deduced: 1) For interfaces based on the Op... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6 Characteristics to be specified | |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.1 General | Article 4.2 of Directive 1999/5/EC [1] obliges Member States to ensure that Network Operators provide a detailed technical description of their interfaces. Sufficient information must be published to allow manufacturers to test: that their equipment conforms to the interface specification, including the relevant essent... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.2 Safety | The safety status of the network interface should be described according the classifications detailed in EG 201 212 [6]. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.3 EMC | It would be helpful for the operator to provide any available information that would assist terminal suppliers to determine their EMC strategy. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.4 Physical characteristics | |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.4.1 Connection method | The mechanical characteristics of the network connection point should be described in sufficient detail as to allow a terminal manufacturer to design or select a connector or an adapter capable of reliably connecting the terminal at the NTP. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.4.2 Connection pin assignment and wiring arrangements | Full details of connector pin assignment should be provided where plug/socket connectors are used at the NTP. Where the NTP is of the hardwired variety, details of cable type and connection arrangements should be provided. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.4.3 Sizing constraints | Any characteristic that may limit the number of terminals that can be connected to the PTN interface should be specified. Examples of such characteristics are maximum power consumption and maximum bus loading. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.5 Electrical Characteristics | |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.5.1 Signal characteristics | Details of the electrical characteristics of the interface such as the range of transmission rates, the range of signal power accepted and delivered by the interface, pulse mask, line code, impedance, timing limitations, etc. should be provided. ETSI ETSI TR 101 731 V1.1.1 (2000-12) 10 |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.5.2 Synchronization | Where the service provides a network source of synchronization or requires synchronization to the network for it to function, sufficient information should be provided to enable the designer to produce a terminal that can synchronize with the network. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.5.3 Power feed conditions | Where power is provided over the interface, full details of the power arrangements should be given. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.6 Optical signal Characteristics | |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.6.1 Signal Characteristics | Details of the optical characteristics of the interface such as the range of transmission rates, the range of signal power accepted and delivered by the interface, pulse mask, line code, timing limitations, etc. should be provided. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.6.2 Synchronization | Where the service provides a network source of synchronization or requires synchronization to the network for it to function, sufficient information should be provided to enable the designer to produce a terminal that can synchronize with the network. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.7 Basic Coding Structure | Details should include items such as state machine, bit stuffing, priority mechanisms and alarm reporting, etc. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.8 Protocol elements and procedures for signalling | Where the Public Telecommunications Network uses a layered protocol architecture, the functions and characteristics of each layer that involves interaction between the terminal equipment and the Public Telecommunications Network should be specified. As an example, for interfaces based on the Open Systems Interconnectio... |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.9 Additional features | Not all interfaces will support all the following features. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.9.1 Voice services | The coding algorithm used to digitize the speech should be detailed. ETSI ETSI TR 101 731 V1.1.1 (2000-12) 11 |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.9.2 Charging information | Where charging information is applied or supplied by the network at the NTP, this should be specified. Examples of charging information might be: - start and/or end time, duration, charge rate, charge volume, etc. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.9.3 "Supplementary" services and optional user facilities | Elements and procedures for the control of supplementary services and optional user facilities, where provided, should be detailed. |
5023a7cc48232e3a72149477ab22f8d9 | 101 731 | 6.9.4 Presentation aspects | Any information related to specific text character presentation by the terminals during communication should be provided. This clause has particular relevance for Telex systems. ETSI ETSI TR 101 731 V1.1.1 (2000-12) 12 Annex A: Extract from Ad-hoc Group C Report Part 3 - Guidelines for Public Network Operators when pub... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 1 Scope | The present document gives guidance on "good engineering practice" with respect to relative levels. |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 2 References | The 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 not apply. • Fo... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3 Definition of the units dBm, dBr and dBm0 | |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.1 General | Transmission values for loss, gain and levels are expressed in decibels (dB) as a general principle. The basic unit "dB" is often extended with additional letters in order to distinguish between its uses in different applications. The aim of this clause is to give a short description of the most common forms as used fo... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.2 The unit "dB" | This basic unit is mainly used for losses, gains, return losses, etc., i.e. as a logarithmic ratio between two values, which can be voltages, currents, powers, acoustic pressures etc. If the ratio is X for voltages, currents, pressures, the dB expression is 20 log (X). If the ratio is Y for powers, the dB expression is... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.3 The unit "dBm" | This unit with the additional "m" is used as a logarithmic measure of the "magnitude" P of an actual signal. The "dBm value" of a signal is called its "absolute power level" or "absolute level". ETSI ETSI TR 101 802 V1.1.1 (2000-06) 6 The signal magnitude P used for signal characterization in speechband applications ha... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.4 The unit "dBr" | This unit is used to characterize "relative levels", i.e. to express the level relations for signals between points in a signal path, with the convention that one of the points is designated as a level reference point with the relative level 0 dBr. More specifically, a sinusoidal reference signal of 1 020 Hz in the spe... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.5 The unit "dBm0" | When using an additional "m" and "0" (zero) with the basic "dB", the level under consideration is expressed as the absolute level (dBm) of the same signal that would be measured at the relevant 0 dBr level reference point. This term is used in conjunction with transmission measurements to specify test levels and test r... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.6 The letter "p" in "dBmp" and "dBm0p" | The additional small letter "p" is derived from the French word "ponderé" for "weighted" and means that the considered value is a noise level, measured by a psophometer with a special noise-weighting filter included as described in ITU-T Recommendation O.41 [5]. |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.7 The relationship between dBm, dBr and dBm0 | The relationship between relative levels at interfaces, which have the same level reference point, and the resulting transmission loss or gain "L", is given by the formula: L = Li - Lo where Li and Lo are the relative input and output levels at the interfaces. The relation between the terms dBm, dBr and dBm0 can be exp... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 3.8 Correction factors | Depending on the type of test instruments, auxiliary equipment and test objects, sometimes correction factors need to be used, to either adjust the correct test signal level, or to obtain the correct test result. This mainly occurs in conjunction with capacitive complex impedances. In practice, test instruments may be ... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4 The concept of "Relative Levels" | |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4.1 General principles | As already mentioned in clause 3, the concept of relative level is applied in many areas. In transmission planning, relative levels are used to characterize "probable signal power levels" occurring in the circuits of the network. In transmission maintenance, relative levels are used to describe loss or gain between poi... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4.3 Relative level designations for a digital path | Most often, the digital path is assigned to the relative level 0 dBr. The absolute level of a signal in a 64 kbit/s PCM path is then determined by ideal encoders and decoders as shown in figure 5. A D N dBm 0 dBr D A 0 dBr N dBm b) Measurement a) Injection (Ideal codecs) Figure 5: Interpretation of absolute signal leve... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4.4.1 Analogue equipment | Large-capacity FDM (carrier) systems are designed to allow, in an up-modulated band, a long-term average of -15 dBm0 per channel, taking into account signalling, carrier leaks and speech pauses. This corresponds to -11 dBm0 actual speech during active periods. (FDM systems with fewer than 240 channels should be designe... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4.4.2 Codecs and digital pads | For 64 kbit/s encoders and decoders regarded as components of an equipment, the digital path is taken to represent the 0 dBr level reference point (see figure 8). 0 dBr 0 dBr a) Encoder b) Decoder Figure 8: 0 dBr level reference points for codecs The performance specification of codecs, as described in ITU-T Recommenda... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4.4.3 Digital exchanges | A digital exchange is built up of half-channels interconnected by a switching matrix. ETSI ETSI TR 101 802 V1.1.1 (2000-06) 17 The power handling properties, which are to be used as a basis for the transmission planning of networks, are described by the relative level designations of the exchange ports (however, these ... |
8f0ca3bfb47a39319e6a52f07236e7d1 | 101 802 | 4.5 Relative levels in transmission planning and maintenance | In transmission planning procedures the overall transmission path is divided into sections in ITU-T vocabulary termed circuits, each having its own 0 dBr Transmission Reference Point (TRP). Most often circuits connect switching centres. Sometimes also the subscriber line connected to a local exchange is termed circuit.... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 1 Scope | The present document provides the basis for specification of requirements and test methods for the low pass section of POTS/ADSL splitters. These splitters are intended to be installed at the Local Exchange side of the local loop and at the user side near the NTP. The splitter at the user side may be part of the networ... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 2 References | For the purposes of this Technical Report (TR), the following references apply: [1] ETSI ETR 328: "Transmission and Multiplexing (TM); Asymmetric Digital Subscriber Line (ADSL); Requirements and performance". [2] ETSI EG 201 120: "Public Switched Telephone Network (PSTN); Method of rating terminal equipment so that it ... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 3 Definitions and abbreviations | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: A-wire and B-wire: wires in the 2-wire local loop connection provided from the exchange to the NTP line sharing: the same local loop (copper pair) is shared by two different operators for two different services NOTE: Application e.g.: ... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 3.2 Abbreviations | For the purposes of the present document, the following abbreviations apply: AC Alternating Current ADSL Asymmetric Digital Subscriber Line CO Central Office (Local Exchange) DC Direct Current DSLAM Digital Subscriber Line Access Multiplexer HPF High Pass Filter ITU International Telecommunication Union LCL Longitudina... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 4 General functional description of splitters | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 4.1 Overview | With some xDSL-systems (e.g. ADSL), POTS- and xDSL- signals may be transported simultaneously on the same copper wire pair in an access network. To separate the signals, devices called splitters are used. One splitter is placed in the Local Exchange (LE splitter), the other at the users premises (Remote splitter). ETSI... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 4.2 Option 1: LPF in splitter unit | This option (figure 2) is commonly used for the "non unbundled"/"non Line Shared" loop. POTS and ADSL are delivered by the same operator. This operator is responsible for the quality of both the POTS and ADSL services. If this solution is used in an "unbundled"/"line sharing" situation, there is a risk of a bridged tap... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 4.3 Option 2: LPF and "weak" HPF in splitter unit | This option describes a splitter unit with an LPF and a "weak" HPF and is intended for line sharing. If POTS and ADSL are provided by one and the same operator, the splitters and the ADSL transceivers are, in general, located very close to each other. In many cases they are in the same cabinet or bay and due to that co... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 4.4 Option 3: LPF, HPF and DC blocking in splitter unit | The solution shown in figure 4 is also suitable/intended for the "unbundled"/"line shared" situation. A full HPF and a DC block function are in the splitter unit. This option provides a good separation of services if the splitter is used by the operator of the access network. The ADSL and POTS operators have no access ... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 4.5 Other aspects | Distributed splitter/micro-filters Because of installation difficulties and costs for installing the user splitter, a so-called "Lite" version of ADSL (ITU-T Recommendation G.992.2 [6]) was developed with lower line speeds. With this system there is in principle no splitter at the users premises. To prevent bad perform... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5 Splitter requirements (Low pass part) | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.1 DC requirements | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.1.1 Polarity independence | The splitter(s) shall conform to all the applicable requirements of the present document for both polarities of the DC line feeding voltage (and the DC line current) provided by the local exchange. This may not apply in the case where a "signature network", described in clause 7.1, is used as this may be polarity depen... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.1.2 DC resistance to earth | Splitters with an earth terminal shall have a sufficiently high resistance to earth. The DC resistance between each terminal (i.e. A-wire and B-wire) of the splitter and earth, when tested with 100 V DC, shall not be less than 20 MΩ. |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.1.3 DC resistance between A-wire and B-wire | The DC resistance between the A-wire and B-wire terminal of the splitter, when tested with 100 V DC, shall not be less than 5 MΩ. This requirement is not applicable if the splitter is equipped with a so called "signature network" (see clause 7.1). |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.1.4 DC series resistance | The DC series resistance of the POTS port to the Line port of one splitter should be less than 50 Ω. This requirement should be met for the feeding conditions described in clause 5.1.5. NOTE: Access network test systems give a number of test results e.g. the "DC-isolation resistance to earth"; "estimation of loop lengt... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.1.5 DC feeding current | The splitter shall fulfil all of the AC requirements in the voice band and for the ADSL band with a DC loop current in the range 0 mA to 80 mA, and all DC requirements with a DC loop current of 15 mA to 80 mA. NOTE: Some older switching systems may operate at loop currents of 125 mA or even higher, but it is unlikely t... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.2 Terminating impedances | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.2.1 ZADSL | In most of the tests with voice frequencies, the ADSL port is terminated with an impedance called ZADSL. ZADSL represents an impedance equal to the input impedance of the ADSL transceiver (with the HPF), as seen from the splitter. This impedance network is given in figure 6. 0,47 mH 120 nF 120 nF 100 nF 100 nF 100 Ω NO... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.2.2 ZR and ZSL | For requirements relating to voice band frequencies described in the present document, the terminating impedances ZR and ZSL are used to terminate the POTS port or the Line port. ZR is the European harmonized complex impedance, ZSL is an impedance used in TBR 038 [10] to simulate a short line terminated in 600 Ω. 750 1... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.2.3 ZRHF | For requirements relating to ADSL frequencies described in the present document, the terminating impedance ZRHF is used to terminate POTS ports. This is the European harmonized complex impedance ZR with the modification proposed in TR 102 139 [3]. This network is shown in figure 9. 150nF 150 47nF 750 120 Ω Ω Ω Figure 9... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.3 Pass band Loss requirements | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.3.1 Voltage drop at 25 Hz and 50 Hz | Ringing signals with frequencies of 25 Hz and 50 Hz should be used. The maximum voltage drop at the load impedance due to the insertion of one splitter, in the test set-up of figure 10, shall be not more than 2 Vrms. Table 2: Test conditions voltage drop at 25 Hz and 50 Hz Impedance of signal source 850 Ω resistive Imp... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.3.2 Insertion loss | The insertion loss of one splitter shall be less than 1 dB at 1 kHz. The Insertion Loss is the difference in loss with and without splitter. The test set up is given in figure 10. Splitter ADSL load Line port ADSL port POTS port ~ Signal source Level meter Z (load) Figure 10: Test set up for Insertion Loss testing on a... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.3.3 Insertion loss distortion | The absolute difference between the insertion loss at any frequency in the range 200 Hz to 4 000 Hz and the insertion loss at 1 kHz shall be less than 1 dB. The test should be executed with the combinations of source and load impedances in table 3. The test set-up is described in figure 10, the DC feeding current is sp... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.4 Impedance at 25 Hz and 50 Hz | The POTS port and the Line port of the splitter should have an impedance at 25 Hz and 50 Hz of not less than 40 kΩ. While testing a port, all other ports are open (non terminated). |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.5 Impedance of splitters in the voice band | It is necessary to identify the desirable characteristics of POTS splitters required to operate satisfactorily in most European telecom networks. In other words, they should not significantly compromise the function of the existing balance of local exchange hybrid networks and of the sidetone networks of installed tele... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6 Impedance of "transparent" and "single impedance" splitters | There are two options for impedance requirements/testing. The choice for and the difference between "option A" or "option B" is explained in clause 5.6.1.3. |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6.1 Impedance of a single LE splitter | |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6.1.1 Impedance testing at the POTS-port, option A | The test set-up is in figure 11. The DC feeding current is specified in clause 5.1.5. The requirements should be met with and without the ADSL port terminated. The "option A" impedance test is used for "transparent" splitters. Line port LE Splitter ADSL load |Z1 + Z2| RL = 20*log ------------ |Z1 - Z2| Z 1 Z 2 POTS por... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6.1.2 Impedance testing at the POTS-port, option B | The test set-up is in figure 11. The DC feeding current is specified in clause 5.1.5. The requirements should be met with and without the ADSL port terminated. The "option B" impedance test is used for "single impedance" splitters. The Return Loss shall fulfil the requirements of ITU-T Recommendation G.992.1, clause E.... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6.1.3 Choice of reference Impedance and Return Loss values (options A or B) | Option A is appropriate for networks where the population of existing terminals or network presentations includes equipment designed against several different reference impedance values (e.g. 600 Ω, harmonized European reference impedance ZR, other complex impedances), such that it is felt that one single reference imp... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6.1.4 Impedance testing at the Line port | The test set-up is in figure 12. The DC feeding current is specified in clause 5.1.5. The requirements should be met with and without the ADSL port terminated. Line port LE Splitter ADSL load Z 2 POTS port ADSL port Z 1 |Z1 + Z2| RL = 20*log ------------- |Z1 - Z2| Figure 12: Impedance testing on a LE splitter (at the ... |
7bf306cb4fc871d0f19a5dd15f9e901d | 101 728 | 5.6.2 Impedance of a single Remote splitter |
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