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08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.11 Transmitter signal model for "ADSL/POTS (FO)" | The PSD template for modelling the "ADSL/POTS (FO)" (TS 101 388 [i.7]) transmit spectrum (a variant with frequency overlapping, previously referred to as Echo Cancelled) is defined in terms of break frequencies, as summarized in table 9. The associated values are constructed with straight lines between these break freq... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.12 Transmitter signal model for "ADSL/POTS (FDD)" | The PSD template for modelling "ADSL/POTS (FDD)" (TS 101 388 [i.7] and ITU-T Recommendation G.992.1 [i.8]) transmit spectra (variants with frequency division duplexing) is defined in terms of break frequencies, as summarized in tables 11 and 10. • Table 10 is to be used for modelling "adjacent FDD modems", usually enha... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.13 Transmitter signal model for "ADSL/ISDN (FO)" | The PSD template for modelling the "ADSL/ISDN (FO)" (TS 101 388 [i.7] and ITU-T Recommendation G.992.1 [i.8]) transmit spectrum (a variant with frequency overlapping, previously referred to as Echo Cancelled) is defined in terms of break frequencies, as summarized in table 12. The associated values are constructed with... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.14 Transmitter signal model for "ADSL/ISDN (FDD)" | The PSD template for modelling "ADSL /ISDN (FDD)" (TS 101 388 [i.7] and ITU-T Recommendation G.992.1 [i.8]) transmit spectra (variants with frequency division duplexing) is defined in terms of break frequencies, as summarized in tables 14 and 13. • Table 13 is to be used for modelling "adjacent FDD modems", usually enh... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.15 Transmitter signal model for "ADSL2/J (FDD)" | The PSD template for modelling the "ADSL2/J (FDD)" transmit spectrum is defined in terms of break frequencies, as summarized in table 15. The associated values are constructed with straight lines between these break frequencies, when plotted against a logarithmic frequency scale and a linear dBm scale. The frequency Δf... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.16 Transmitter signal model for "ADSL2/M (FDD)" | The PSD template for modelling the "ADSL2/M (FDD)" transmit spectrum is defined in terms of break frequencies, as summarized in tables 17 and 18. The associated values are constructed with straight lines between these break frequencies, when plotted against a logarithmic frequency scale and a linear dBm scale. The freq... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.17 Transmitter signal model for "VDSL1" | VDSL1 is defined for a range of scenarios, each with its own template PSD. The ETSI VDSL1 standard (TS 101 270-1 [i.11]) has foreseen the various pairs of PSD templates for upstream and downstream transceivers, as summarized in tables 19 to 22. The PSD template for modelling each of these "VDSL1" transmit spectra, is d... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.17.1 Templates compliant with the ETSI main band plan | Table 23: Default US PSD templates E1::P.M1 E1::P.M2 Frequency [kHz] Template [dBm/Hz] Frequency [kHz] Template [dBm/Hz] With optional band 0 -110 0 -110 4 -110 4 -110 25 -40 25 -40 138 -40 138 -40 307 -90 307 -90 482 -100 482 -100 Without optional band 0 -110 0 -110 225 -110 225 -110 226 -100 226 -100 Common PSD 2 825... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.17.2 Templates compliant with the ETSI optional band plan | Table 27: Optional US PSD templates E2::P.M1 E2::P.M2 Frequency [kHz] Template [dBm/Hz] Frequency [kHz] Template [dBm/Hz] With optional band 0 -110 0 -110 4 -110 4 -110 25 -40 25 -40 138 -40 138 -40 307 -90 307 -90 Without optional band 0 -110 0 -110 225 -110 225 -110 226 -100 226 -100 Common PSD 482 -100 482 -100 3 57... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18 Transmitter signal models for "VDSL2" | The PSD templates for VDSL2 are to model the VDSL variants being defined in ITU T recommendation G993.2 [i.13]. The complexity of VDSL2 (many flavours, many kinds of PSD shaping/PBO in downstream and upstream, power restrictions) requires a break-down of the specification of a PSD template for a particular scenario. Fi... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.1 Noise floor | The noise floor defines a base line PSD, as input for the first building block. Suitable noise floors are pre-defined in table 31, but the model is not restricted to any of these pre-defined PSDs. Table 31: Pre-defined noise floors, derived from clause B4.1 in G993.2 [i.13], as starting PSD for building block #1 NF_998... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.2 Building block #1 for "PSD Band Constructor" | Building block #1 for the "PSD band constructor" generates a static PSD template, selected from a set of PSD bands. Pre-defined spectra are provided by means of break point tables, up to 30 MHz, but the use of the algorithmic model is not restricted to these tables. The model in figure 2 starts from a PSD, representing... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.3 Building block #2 for "PSD Shaper" | Building block #2 is typically algorithmic in nature, roughly following the way it is formulated in ITU-T recommendation G997.1 [i.16]. A difference is that shaping is to be applied in this building block to PSD templates and not to PSD masks. The model in figure 4 provides the generic idea, but details are currently l... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.4 Building block #3 for "PSD notcher" | Building block #3 enables to punch notches in the spectrum, to reduce the effect of unwanted radiated emissions from VDSL2 causing undue interference to existing licensed users of that part of the spectrum. The description of this building block is roughly the same as for building block #2 ("PSD band constructor"), but... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.5 Building block #4 for "PSD Power Restrictor" | Building block #4, shown in figure 6, enables to cut-back the overall PSD when its aggregate power appears to be above a certain power limit. Such a cut-back is to be applied when for instance a modem implementation is unable to generate powers beyond that limit, or when the output PSD has to be compliant with maximum ... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.6 Pre-defined downstream tables for "PSD Band Constructor" | The PSD band constructor in building block #1 can be controlled via an arbitrary number of PSD bands. Pre-defined PSD bands for downstream transmission are summarized in tables 35 to 43 and specified by means of breakpoints. Each PSD band has its own (unique) identifier (summarized in table 34), for convenient referenc... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.7 Pre-defined upstream tables for "PSD Band Constructor" | The PSD band constructor in building block #1 can be controlled via an arbitrary number of PSD bands. Pre-defined PSD bands for upstream transmission are summarized in tables 45 to 53 and specified by means of breakpoints. Each PSD bands has its own (unique) identifier (summarized in table 44), for convenient referenci... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 4.18.8 Example definitions of VDSL2 transmitters | The above pre-defined break point tables enable the construction of all PSD combinations (profiles and band plans) being identified in ITU-T recommendation G993.2 [i.13]. For example, table 54 shows a full elaboration for several ITU profiles within limiting mask "B8-4" (also known as "998-M2x-A") and "B8-6" (also know... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5 Generic receiver performance models for xDSL | A receiver performance model is capable of estimating up to what performance a data stream can be recovered from a noisy signal. In all cases it assumes that this recovery meets predefined quality criteria such as a maximum error better then BER<10-7 (Bit Error Ratio). The word performance refers within this context to... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.1 Generic input models for effective SNR | An input (sub) model describes how to evaluate the effective SNR, as intermediate result (see figure 7), from various input quantities and imperfections. To simplify further analysis of performance quantities like noise margin and signal margin, the effective SNR is often expressed in its offset format, characterized b... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.1.1 First order input model | This input model is a simplified model that assumes that the SNR of the input signal is internally modified by internal receiver noise (PRN0). Most imperfections of the receiver (such as front-end noise, imperfect echo suppression, imperfect equalization and quantization noise) are assumed to be concentrated in a singl... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.2 Generic detection models | This clause identifies several generic (sub) models for the detection block: one line code independent model derived from the Shannon capacity limit, and various line code dependent models dedicated to PAM, CAP/QAM or DMT line coding. Table 57 summarizes the naming convention for input and output quantities. Table 57: ... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.2.1 Generic Shifted Shannon detection model | The calculation of the margin m using the generic Shifted Shannon detection model, is equivalent to solving the equation in expression 9. It has been derived from Shannon's capacity theorem, by reducing the effective SNR ("shifting" on a dB scale) by the SNR-gap Γ, to account for the imperfections of practical detector... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.2.2 Generic PAM detection model | The calculation of the margin m using the generic PAM detection model is equivalent to solving the equation in expression 10. This model assumes ideal decision feedback equalizer (DFE) margin calculations. The associated parameters are summarized in table 59. The effective SNR is to be evaluated by using one of the inp... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.2.3 Generic CAP/QAM detection model | The calculation of the margin m using the generic CAP/QAM detection model is equivalent to solving the equation in expression 11. This model assumes ideal Decision Feedback Equalizer (DFE) margin calculations. The associated parameters are summarized in table 60. The effective SNR is to be evaluated by using one of the... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.2.4 Generic DMT detection model | The calculation of the margin m using the generic DMT detection model is equivalent to solving the equations in expression 12, for a given line rate fb (or given data line rate fbd). The associated parameters are summarized in table 61, and function load is specified by the chosen bit-loading algorithm. The effective S... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.3 Generic models for echo coupling | |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 5.3.1 Linear echo coupling model | This model describes a property of linear hybrids in transceivers, and models what portion of the transmitted signal couples directly into the receiver. The hybrid is characterized by two parameters: • RV, representing the output impedance of the transceiver. Commonly used values are the design impedances of the modems... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6 Specific receiver performance models for xDSL | This clause defines parameter values for the generic performance models of clause 5, to provide implementation specific models for various xDSL modems. |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.1 Receiver performance model for "HDSL.2B1Q" | The reach predicted by this calculation model, under the stress conditions (loss, noise) of the associated ETSI HDSL specification (TS 101 135 [i.4]), is close to the reach required by ETSI specification (TS 101 135 [i.4]). The receiver performance model for ETSI compliant HDSL.2B1Q is built-up from the following build... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.2 Receiver performance model for "HDSL.CAP" | This calculation model is capable for predicting a performance that is benchmarked against the performance requirements of an ETSI compliant HDSL-CAP modem (TS 101 135 [i.4]). The reach predicted by this model, under the stress conditions (loss, noise) of the associated the TS 101 135 [i.4], is close to the reach requi... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.3 Receiver performance model for "SDSL" | This calculation model is capable of predicting a performance that is benchmarked against the performance requirements of an ETSI compliant SDSL modem (TS 101 524 [i.5]). The reach predicted by this model, under the stress conditions (loss, noise) of the associated the ETSI SDSL specification (TS 101 524 [i.5]) is clos... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.4 Receiver performance model for "ADSL/POTS (FO)" | This calculation model is capable of predicting a performance that is benchmarked against the performance requirements of an ETSI compliant "ADSL/POTS (FO)" modem. The reach predicted by this model, under the stress conditions of the associated ETSI ADSL specification (TS 101 388 [i.7]), is close to the minimum reach r... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.5 Receiver performance model for "ADSL/POTS (FDD)" | The receiver performance models for ETSI compliant "ADSL/POTS (FDD)" are build-up from the following building blocks: • A first order (linear) input model for the input block specified in clause 5.1.1, that combines all kinds of imperfections (front-end noise, residual echo and equalization errors), in one virtual nois... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.6 Receiver performance model for "ADSL/ISDN (FO)" | This calculation model is capable of predicting a performance that is benchmarked against the performance requirements of an ETSI compliant "ADSL/ISDN (FO)" modem. The reach predicted by this model, under the stress conditions of the associated ETSI ADSL specification (TS 101 388 [i.7]), is close to the minimum reach r... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.7 Receiver performance model for "ADSL/ISDN (FDD)" | The downstream receiver performance model for ETSI compliant "ADSL/ISDN (FDD)" is build-up from the following building blocks: • A first order (linear) input model for the input block specified in clause 5.1.1, that combines all kinds of imperfections (front-end noise, residual echo and equalization errors), in one vir... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 6.8 Receiver performance model for "VDSL" | NOTE: This model is left for further study. ETSI ETSI TR 101 830-2 V1.2.1 (2008-07) 66 |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 7 Transmission and reflection models | |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 7.1 Summary of test loop models | Over the years, a variety of two-port models have been extracted from cable measurements up to 30 MHz, and published in several documents. These models are so numerous due to the wide range of cables being used in different countries. An example of a two-port models of a 100 Ω cable and of a 150 Ω cable can be found in... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8 Crosstalk models | Crosstalk is commonly a dominant contributor to the overall disturbance that impairs a transmission. Crosstalk models are to evaluate how much crosstalk originates from various disturbers that are distributed over the local loop wiring. In practice this is not restricted to a one-dimensional cable topology, since wires... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.1 Basic models for crosstalk cumulation | Cumulation models relate the crosstalk powers generated by multiple disturbers with the number and type of these disturbers. The meaning of the crosstalk power is not obvious. When a cable with N wire pairs is filled-up completely with similar disturbers, the resulting crosstalk power in each wire-pair (from N-1 distur... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.1.1 Uniform cumulation model | The uniform cumulation model is restricted to the special case that all disturbers are from the same type. It assumes that the probability limit from M disturbers is proportional with M1/Kn, where Kn is an empirical parameter (values like Kn=1/0,6 are commonly used for 99 % worst case analyses). Expression 14 shows thi... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.1.2 FSAN sum for crosstalk cumulation | The FSAN sum is a cumulation model that is also applicable when different disturbers are involved. It is a generalization of the uniform cumulation model, and is specified in expression 15. The (frequency dependent) probability limit of the crosstalk, caused by M individual disturbers, is expressed below. ( ) 6,0 1 , )... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.2 Basic models for NEXT and FEXT coupling | These sub-models for crosstalk coupling are to evaluate the normalized crosstalk power, as defined before in expression 14, that a single disturbing modem pair couples into a specific (other) wire-pair in the cable. However, it should be noted that the models in this clause are restricted to normalized crosstalk coupli... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.3 Basic models for crosstalk injection | These sub-models are applicable to studies where the noise level has to be adjusted for impedance mismatch. When the impedance of the victim modem changes, the noise (and signal) observed by the receiver will change as well. To account for this effect, a crosstalk injection block can be included in a topology models. T... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.3.1 Forced noise injection | When crosstalk injection is modelled by means of forced noise injection, then all impedance and frequency dependency of noise injection is ignored. The associated transfer function is shown in expression 20. 1 ) ( = f H xi Expression 20: Transfer function for forced noise injection ETSI ETSI TR 101 830-2 V1.2.1 (2008-0... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.3.2 Current noise injection | When crosstalk injection is modelled by means of current noise injection, then it is assumed that the impedance dependency can be represented by the equivalent circuit diagram shown in figure 13. The associated transfer function is shown in expression 21. • The injection condition holds when the performance is evaluate... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.4 Overview of different network topologies | The results of spectral management studies are highly dependent on the chosen network topology, which is very country and location specific. The most simple topology models assume that all disturbers are co-located at only two locations; one at each end of a cable. This approximation is computational convenient but is ... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.5 Crosstalk evaluation for multi-node topologies | If a victim modem pair is impaired by disturbers from all kinds of locations, the evaluation of the crosstalk probability limits may be rather complex. Figure 14 shows an example of the wiring in a multi-node topology. LT ports in local exchange LT ports in cabinet NT ports, area 1 NT ports, area 2 Figure 14: Example o... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 8.6 Crosstalk evaluation for two-node topologies | In the special (simplified) case that all disturbers are co-located with one of the two victim modems, the generalized approach in expression 22 can be simplified significantly. Such an approach can be applicable to scenarios with long distribution cables in which all customers can be regarded are virtually co-located ... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9 Examples of evaluating various scenarios | This clause summarizes examples to show how the models in the present document can be used to perform spectral management studies. |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9.1 European Spectral Platform 2004 (ESP/2004) | In 2004 several European operators created a simulation platform to support spectral management studies on e-SDSL and ADL-64. This platform comprises several (theoretical) scenarios to cover a wide range of situations being identified in European access networks. Each scenario is a compromise between computational conv... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9.1.1 Technology mixtures within ESP/2004 | A distinct number of technology mixtures have been identified to enable a reasonable representation of scenarios that are being deployed in various European Networks. Their names are specified in table 69. Table 69: Naming convention of used mixtures Name Description of the mix High penetration mixtures HP/M Mix includ... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9.1.2 System models within ESP/2004 | Table 71 specifies transmitter signal models for each system being part of the mix. Power back-off or power cut-back is taken into account for all the systems for which it is mandatory in the relevant specification. Concerning VDSL1 UPBO, use the reference PSD for Noise D (see TS 101 270-1 [i.11]) in high penetration s... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9.1.3 Topology models within ESP/2004 | The scenario assumes that an uninterrupted homogeneous cable, without branches, interconnects the victim system under study. In addition, it assumes that the network topology can be represented by a simple (point-to-point) two-node topology model (see clause 8.6). This is of course an over-simplification of real access... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9.1.4 Loop models within ESP/2004 | The models for transmission and crosstalk are specified in table 77. For the sake of simplicity, all effects related to the impedance for both the insertion loss and the crosstalk calculations are ignored. The impedance of 135 Ω is selected for all the systems, even if this is not correct for such systems like e.g. tho... |
08e1ba5192b27e9b78740fab31d0eae8 | 101 830-2 | 9.1.5 Scenarios within ESP/2004 | To carry out a spectral management study for a "new system" under ESP/2004, the six scenarios in table 78 are to be evaluated according to the reference method. This means that the change in performance is to be evaluated for each broadband system in the mix of each scenario, when the mix changes from the "reference mi... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 1 Scope | The present document gives guidance on a common language for Spectral Management specifications. It provides a set of definitions on Spectral Management quantities, including: a) a description of the technical purpose of Spectral Management; b) a common reference model to identify LT-ports, NT-ports, upstream, downstre... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 2 References | References are either specific (identified by date of publication and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • Non-specific reference may be made only to a complete document or a part thereof and only in the following cases: - if it is accept... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 2.1 Normative references | The following referenced documents are indispensable for the application of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. Not applicable. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 2.2 Informative references | The following referenced documents are not essential to the use of the present document but they assist the user with regard to a particular subject area. For non-specific references, the latest version of the referenced document (including any amendments) applies. POTS and ANALOGUE [i.1] ETSI TBR 021: "Terminal Equipm... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 3 Definitions and abbreviations | |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 3.1 Definitions | For the purposes of the present document, the following terms and definitions apply: access port: physical location, appointed by the loop provider, where signals (for transmission purposes) are injected into the local loop wiring access rule: mandatory rule for achieving access to the local loop wiring, equal for all ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 3.2 Abbreviations | For the purposes of the present document, the following abbreviations apply: AC/ac Alternate Current ADSL Asymmetric Digital Subscriber Line AIS Alarm Indication Signal CAP Carrierless Amplitude/Phase modulation CMP Cable Management Plan CSS Customer-side Signal Source DC/dc Direct Current DPBO Downstream Power Back-Of... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 4 The technical purpose of Spectral Management | Connecting a signal to a wire pair of a (metallic) access network cable causes parts of that signal couple to other wire pairs in the same cable bundle or binder group. Connecting more systems to the same cable will increase the total crosstalk noise level in each wire-pair, and disturbs systems that were already insta... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 4.1 Bounding spectral pollution | The objective for spectral management is to control the maximum spectral pollution, thus enabling an efficient use of the access network for all connected systems. This can be achieved by focussing on the use of near-compatible systems in the same cable or cable bundle. Spectral management is an issue for both the loop... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 4.2 The individual components of spectral pollution | Defining adequate rules for controlling spectral pollution requires a technical understanding of how individual disturbers contribute to the total impairment. The crosstalk coupling functions and the attenuation characteristics of an existing access network are fixed and from an electrical point of view the network can... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 5 Reference model of the local loop wiring | This clause describes the reference model of the local loop wiring of an access network, from a spectral management point of view. It illustrates that local loop cable sections are asymmetrical in nature, because equipment near the local exchange side may differ from equipment near the customer side. ETSI ETSI TR 101 8... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 5.2 Bounding spectral pollution by limiting signals at the ports | The signal limits that are summarized in the present document can be used to limit injected signals as they can be observed at the ports of the LLW. The signals that many DSL systems generate are asymmetrical in nature. For instance ADSL systems generate different data signals in different transmission directions. ISDN... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 5.3 Reference model | Figure 2 shows a generic reference model of the Local Loop Wiring (LLW), from a Spectral Management point of view. The signals of various Signal Sources connected to the LLW flow into the LLW through well-identified ports. The following naming convention is used: • The signals that flow through an LT-port into the Loca... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 6 Minimum set of characteristics for signal descriptions | To classify signals for spectral management purposes, the following parameters are relevant: • Total signal voltage (or power). • Peak amplitude. • Narrow-band signal voltage (or power). • Unbalance about earth (LOV and LCL). • Feeding Power (if relevant). In some cases, additional parameters are required, such as feed... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 7 Cluster 0 signals (DC power feeding) | This cluster summarizes maximum DC feeding voltages and currents, used for remote powering of transmission equipment (including POTS, ISDN, HDSL and SDSL). The DC power-feeding limits are supplementary to the AC signal descriptions in the succeeding clusters 1 to 5. By referring to both kinds of signal descriptions, th... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 7.1 "Class A" TNV power feeding (from LT-port) | This category covers feeding voltages and currents that do not exceed the requirements relevant for safety, as can be found in Cenelec [i.19], [i.17] safety standards for TNV-3 circuits. TNV-3 circuits have an operating voltage limit defined as a combination of the maximum DC-voltage and the peak AC-voltage, and may be... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 7.2 "Class B" RFT power feeding (from the LT-port) | This category covers feeding voltages and currents that do not exceed the requirements relevant for safety as can be found in CENELEC [i.18] safety standards for RFT circuits (Remote Feeding Telecommunication). RFT circuits are subdivided into current limited circuits (RFT-C) and voltage limited circuits (RFT-V). The c... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8 Cluster 1 signals (voice band) | This cluster summarizes signals that are generated by analogue transmission equipment (including POTS), voice band modems, analogue leased lines, telex signals encoded as voice band signals and music lines. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1 "POTS" signals (voice band lines 300 Hz to 3 400 Hz) | This category covers signals from telephony transmission equipment (e.g. telephones, voice band modems, Faxes, analogue leased lines, etc.) on a single wire pair. Unless other specified, the requirements on DTMF-signals (Dual Tone Multi-Frequency), as defined in [i.1], are equal to the voice signal. A signal can be cla... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.1 Total signal voltage | The present document provides information on how compliance with this signal category can be achieved and indicates where it is specified: To be compliant with this signal category, the mean signal voltage over a reference impedance ZR (see figure 5) shall not exceed a level of -9,7 dBV, measured within a frequency ban... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.2 Peak amplitude | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the peak-to-peak signal voltage over a reference impedance ZR (see figure 5) shall not exceed a level of 5,0 V, measured within a ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.3 Narrow-band signal voltage | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the narrow-band signal voltage (NBSV) shall not exceed the limits given in table 1, at any point in the frequency range 100 Hz to ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.4 Unbalance about earth | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the balance of the signal that may flow through the LT-port or NT-port shall exceed minimum requirements, under the condition that... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.5 Feeding power (from the LT-port) | Power feeding is no integral part of this signal category, although it is not uncommon for POTS services. To enable power feeding in combination with this signal category, refer to Class A in clause 7. However, when ringing signals are present, the requirements in EN 0-1 [i.17], annex M has to be followed. Reference: E... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.6 Reference impedance ZR | The reference impedance ZR, that is used to enable the specification of various signal levels, is the European harmonized complex impedance. This harmonized complex impedance (see figure 5) equals 270 Ω in series with a parallel combination of 750 Ω and 150 nF. Reference: TBR 021 [i.1], clause A.2.1. 750 Ω 270 Ω 150 nF... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.7 Ringing signal | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the AC ringing voltage shall not exceed the maximum values in table 5. The AC ringing signal may be or may be not superimposed on ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 8.1.8 Metering signals | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, 50 Hz common mode metering pulses (if added to POTS lines), shall be within the limits of table 6. NOTE: Most access networks are ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9 Cluster 2 signals (semi broadband) | This cluster summarizes signals that are generated by digital transmission equipment up to 160 kbit/s, including ISDN-BA and 64 kbit/s and 128 kbit/s leased lines. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.1 "ISDN.2B1Q" signals | This category covers signals generated by ISDN transmission equipment on a single wire-pair, based on 2B1Q line coding. This clause is based on the ETSI reports on ISDN equipment [i.6]. A signal can be classified as an "ISDN.2B1Q signal" if it is compliant with all the clauses below. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.1.1 Total signal power | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the mean signal power into a resistive load of 135 Ω shall not exceed a level of +13,5 dBm (± 0,5 dBm), measured within a frequenc... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.1.2 Peak amplitude | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the nominal voltage peak of the largest signal pulse into a resistive load of 135 Ω shall not exceed a level of 2,5 V (± 5 %), mea... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.1.3 Narrow-Band Signal Power (NBSP) | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the Narrow-Band Signal Power (NBSP) into a resistive load impedance R, shall not exceed the limits given in table 7, at any point ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.1.4 Unbalance about earth | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the balance of the signal that may flow through the LT-port or NT-port shall exceed minimum requirements, under the condition that... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.1.5 Feeding power (from the LT-port) | Power feeding is no integral part of this signal category, although it is not uncommon for ISDN.2B1Q services. To enable power feeding in combination with this signal category, refer to one of the power feeding classes summarized in clause 7. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.2 "ISDN.MMS.43" signals | This category covers signals generated by ISDN transmission equipment on a single wire-pair, based on MMS 43 (also known as 4B3T) line coding. This clause is based on the ETSI reports on ISDN equipment [i.6]. A signal can be classified as an "ISDN.MMS.43" signal if it is compliant with all clauses below. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.2.1 Total signal power | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the mean signal power into a resistive load of 150 Ω shall not exceed a level of +13,5 dBm (±0,5 dBm), measured within a frequency... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.2.2 Peak amplitude | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the nominal voltage peak of the largest signal pulse into a resistive load of 150 Ω shall not exceed a level of 2,0 V (± 10 %), me... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.2.3 Narrow-band signal power | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the Narrow-Band Signal Power (NBSP) into a resistive load impedance R, shall not exceed the limits given in table 10, at any point... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.2.4 Unbalance about earth | The present document provides information on how compliance with this signal category can be achieved and indicates the relevant specification(s): To be compliant with this signal category, the balance of the signal that may flow through the LT-port or NT-port shall exceed minimum requirements, under the condition that... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.2.5 Feeding power (from the LT-port) | Power feeding is no integral part of this signal category, although it is not uncommon for ISDN.MMS.43 services. To enable power feeding in combination with this signal category, refer to one of the power feeding classes summarized in clause 7. |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.3 "Proprietary.SymDSL.CAP.QAM" signals | This category covers signals, generated by Proprietary multi-rate SymDSL transmission equipment on one wire-pair. This signal is labelled as Proprietary, since it is not covered by ETSI, ITU nor ANSI product standards. This signal definition is linecode independent, but dedicated to signals from transmission equipment ... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.3.1 Total signal power | The present document provides information on how compliance with this signal category can be achieved: To be compliant with this signal category, the mean signal power into a resistive load of 135 Ω shall not exceed a level of +14 dBm, measured within a frequency band from at least 100 Hz to 1 MHz. NOTE: No ETSI delive... |
32347bacbd44eee2fd8cd2c5065911f1 | 101 830-1 | 9.3.2 Peak amplitude | The present document provides information on how compliance with this signal category can be achieved: To be compliant with this signal category, the nominal voltage peak of the largest signal pulse into a resistive load of 135 Ω shall not exceed a level of 7,5 V (15 V peak-peak), measured within a frequency band from ... |
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