1、STD.ETS1 ETR IZA-ENGL L77b 3400855 OLb0038 175 ETSI TEIHNICAL REPORT ETR 328 November 1996 Source: TCKM Reference: DTRKM-06001 ICs: 33.020 Key words: ADSL, digital, access, transmission, multimedia, subscriber Transmission and Multiplexing (TM); Asymmetric Digital Subscriber Line (ADSL); Requirement
2、s and performance ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-O6921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, c=secretariat - Internet: secretariatetsi.fr Tel
3、.: +33 4 92 94 42 O0 - Fax: +33 4 93 65 47 16 - 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. 8 European Telecommunications Standards Institute 1996. All rights reserved.
4、Page 2 ETR 328: November 1996 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Editing and Committee Support Dept.“ at the address shown
5、on the title page. Page 3 ETR 328: November 1996 Contents Foreword . 5 Scope 7 References 7 Definitions. symbols and abbreviations . 7 3.1 Definitions 7 3.2 Symbols . 7 3.3 Abbreviations . 7 Bearer channel allocations 8 Noise models . 8 5.1 Injection method 8 5.2 Crosstalk noise sources . 8 Test loo
6、ps 10 ADSUPOTS splitter impedances 22 Testing . 22 8.1 Maximum stress linearity test 22 History 23 STD-ETSI ETR 328-ENGL L77b 3400855 OLb004L 7bT Page 4 ETR 328: November 1996 Blank page Page 5 ETR 328: November 1996 Foreword This ETSI Technical Report (ETR) has been produced by the Transmission and
7、 Multiplexing (TM) Technical Committee of the European Telecommunications Standards Institute (ETSI). - STD-ETSI ETR 328-ENGL L77b 3400855 OLb0043 532 Page 6 ETR 328: November 1996 Blank page STD-ETSI ETR 328-ENGL 177b 3400855 U1b0044 479 Page 7 ETR 328: November 1996 1 Scope This ETR describes a tr
8、ansmission technique called Asymmetric Digital Subscriber Line (ADSL). The requirements for the ADSL transmission system and the transmission performance are defined in this report. ADSL allows the provision of a variety of digital channels on the same, single subscriber line as the analogue telepho
9、ne service. An ADSL system contains several digital channels. Some of them are full duplex low-speed channels and the others are simplex high-speed channels. The high-speed channels are transported only in the direction to the customer premises. This ETR is based on ANSI T1.413 l provided by the ANS
10、I committee T1 El .4 and contains only specific European topics not covered by ANSI T1.413 111. These are, for example, the test requirements including test noise and test loops for transportation of n x 2 048 Mbis (n = 1,2,3) and the so-called POTS splitter, which separates the analogue telephone b
11、and from that used by the ADSL transmission system (where POTS is Plain Old Telephony Service). 2 References 1 ANSI T1.413-1995: “Telecommunications - Network and Customer Installation Interfaces - Asymmetric Digital Subscriber Line (ADSL) Metallic Interface.“ 3 Definitions, symbols and abbreviation
12、s 3.1 Definitions 2M1: Classification of an ADSL system capable of transporting 6 144 kbit/s downstream towards the ADSL Network Termination (ANT). 2M2: Classification of an ADSL system capable of transporting 4 096 kbis downstream towards the ANT. 2M3: Classification of an ADSL system capable of tr
13、ansporting 2 048 kbis downstream towards the ANT. 3.2 c G L R 3.3 ADSL ALT ANSI ANT ATU-C ATU-R BRA dBm ETR FDM FEC HDB3 ISDN PE POTS PSD TC Symbols capacitance nanofarads per km (nF/km) leakance Siemens per krn (S/km) inductance microHenries per km (pH/km) resistance Ohms per km (inlkm) Abbreviatio
14、ns Asymmetric Digital Subscriber Line ADSL Line Termination (in l referred to as ATU-C) American National Standards Institute ADSL Network Termination (in l referred to as ATU-R) ADSL Transmission Unit - Central Office ADSL Transmission Unit - Remote Basic Rate Access deciBel referred to 1 milliwatt
15、 ETSI Technical Report Frequency Division Multiplexing Forward Error Correction High Density Bipolar 3 Integrated Services Digital Network Pol yEthylene Plain Old Telephony Service Power Spectral Density Trellis Coding STD-ETSI ETR 328-ENGL 177b 3Li00855 O1bOO95 305 Transport class 2M1 2M2 Page 8 ET
16、R 328: November 1996 Configuration Simplex downstream rate Duplex rate(s) kbis kbis 6 144 160 (notel) 1 4 096 160 (notel) 64 (C) (note2) 4 Bearer channel allocations 2M2 2M3 The transport class and configuration of those which are appropriate for 2 048 kbit/s applications are shown in table 1. The n
17、oise models and test loops presented in this ETR are for bearer channel allocations as shown in table 1. 64 (C) (note2) 2 4 096 64 (C) (note2) 1 2 048 160 (notel) Table 1 : Bearer channel allocations I I16 (C) (note2) NOTE 2: This duplex channel is reserved for control purposes of the application. 5
18、 Noise models Two noise sources are described for the testing of ADSL systems. These are frequency-domain sources that model the steady state operating environment caused by crosstalk from adjacent wire pairs due to differing transmission systems. The two models differ due to the need to cater to co
19、untries that may or may not have High Density Bipolar 3 (HDB3) based primary rate systems operating at 2 048 kbit/s in their access networks. Model A is for the case where no such interferers exist while model B includes the crosstalk coupling effects of these types of systems. The need for amateur
20、radio interferers was specially expressed by the countries supporting noise model A and is therefore included only there. 5.1 Injection method The injection circuit should have a Thevenin impedance of at least 4 kf. The spectral density of the crosstalk noise sources should be measured at the output
21、 of the injection circuit, replacing the test loop by a 50 R resistor and with no terminal equipment connected. 5.2 Crosstalk noise sources The Power Spectral Density (PSD) of the crosstalk noise sources used for performance testing is given in figure 1 for model A and in figure 2 for model B. Model
22、 A includes discrete tones, which represent radio frequency interference that is commonly observed, especially on wire pairs routed over-ground. Further details of the specification of these noise models are shown in tables 2 to 4. The resulting wideband noise power over the frequency range 1 kHz to
23、 1,5MHz for model A is -49,4 dBm * 0,5 dBm and for model B is -43,O dBm * 0,5 dBm. The noise probability density function should be approximately Gaussian with a crest factor greater than or equal 5. The accuracy of the power spectral density should be when measured with a resolution bandwidth of 1
24、kHz. 1 dB over the frequency range 1 kHz to 13 MHz, NOTE: For the ADSL Line Termination (ALT) transmitter mask it is assumed that the slope from the pass band to the upper stop band is -80 dB/decade due to the 4th order low pass filtering as it is assumed in annex 8.4 of l. Page 9 ETR 328: November
25、1996 Frequency (kHz) 1 -40 dB/decade slope u( 1 10 100 1000 10000 Frequency (kk) PSD PSD (dBmlHz) (pV/dHz) -1 O0 3.16 Figure 1: Single sided noise Power Spectral Density (PSD) into 50 i2 for model A 79,s 795 1 500 Table 2: Co-ordinates for noise model A -, -100 3,16 -140 0.03 -140 0,03 Frequency (kH
26、z) 99 Power (dem) -70 207 333 387 531 603 71 1 80 1 909 98 1 -70 -70 -70 -70 -70 -70 -70 -70 -70 STD.ETSI ETR 328-ENGL L77b m 3900855 OLbOO9-i LAB m n -110 -120 Page 10 ETR 328: November 1996 - 1 I I -20 dB/decade clope (kHr) 1 (dBm/Hz) (pV/dHr) -80 31,62 Figure 2: Single sided noise PSD into 50 i2
27、for model B 300 71 1 1 500 Table 4: Co-ordinates for noise model B -1 O0 316 -115 0,56 -1 15 0,56 Frequency I PSD I PSD I 10 I -1 O0 I 3,16 I 6 Testloops For the purposes of testing the performance of the ADSL system incorporating the bearer channel capabilities outlined in clause 4, the test loops
28、specified in figure 3 should be used. The power spectral density of the ADSL downstream transmission is as described in subclause 6.13 of ANSI T1.413 l with the proviso that the power boost option in ANSI T1.413 l is not used for test purposes. The primary line constants (RI, L - coding gain: 3 dB (
29、only FEC); - lower cut off frequency: 88 kHz. STD-ETSI ETR 328-ENGL 177b m 1400855 OLb0048 014 m Om Page 11 ETR 328: November 1996 0,4 rnm PE 0,4 mm PE - 1,l krn X km ANT I O krn ALT I loop #O loop #1 loop #2 loop #3 loop #4 loop #5 loop #6 loop #7 loop #8 null loop X km I 0,4 mrn PE 1 I XI krn I I
30、0,5 mm PE I 1,5 km XI km 0,5 mm PE 0,4 mm PE I 0.5 km - 15 km - X km - 0,2 km 0,63mmPE- 0,5mmPE - 0,4 mm PE - 0,32 mm PE 0,5 km 0,5 km - 0,75 krn X km 0,9 mmPE - 0,63mm PE - 0,5 mm PE - 0,4 mm PE 0,5 km 125 km X km 0,63 mm PE 0,5 mm PE 0,4 mrn PE - - 4 km X km 0,2 km - 0,9mm PE 0,4 mrn PE - 0,32 mm
31、PE I Figure 3: Test loop set for transport classes 2Ml12M2, and 2M3 with noise model A or B Page 12 ETR 328: November 1996 Loop # Nominal value of adjustable length 300 kHz XI Loop insertion loss at (km) (dB) 1 2.90 1 41 .O Table 6: Loopset insertion loss and nominal lengths for 2M1 (noise model B)
32、I I Nominal value of 1 Loop insertion loss at I -,- - 2 3,85 3 1,80 4 1.25 Loop # adjustable length I I X - -7- 41 ,O 41 ,O 41 .O 300 kHz I 5 6 7 I (km) (dB) 1 I nn I 3c 1,85 41 ,O 1,70 41 ,O 0,85 41 ,O 0,60 0,oo 25 0,35 26 Loop # Nominal value of adjustable length 300 kHz X Loop insertion loss at 5
33、 6 7 I 81 1,85 I 47 I I - .- 2,20 46 2,10 47 1.20 47 Loop # Nominal value of adjustable length 300 kHz X Loop insertion loss at Table 9: Loop-set insertion loss and nominal lengths for 2M3 configuration 1 (noise model A) 1 2 3 4 5 6 7 8 (km) (dB) 2,15 30 2,80 30 0,95 30 0,50 30 1,lO 30 0,95 30 0,l o
34、 30 0,70 31 Nominal value of 1 Loop # I adjusta: length Loop insertion loss at 300 kHz Table 1 O: Loop-set insertion loss and nominal lengths for 2M3 configuration 2 (noise model A) 1 2 (km) (dB) 3,45 49 4,60 49 3 4 5 6 7 8 2,30 49 1,80 49 2,35 49 2,20 49 130 49 1,25 43 Nominal value of I Loop # I a
35、djusta? length Loop insertion loss at 300 kHz 1 2 (km) (dB) 3,60 51 4.80 51 3 4 5 6 7 8 2,45 51 1,90 51 2,50 51 2,35 51 1,60 51 1,80 51 STD-ETSI ETR 328-ENGL 177b 3400855 OLbO051 b07 M Loop # Page 14 ETR 328: November 1996 Nominal value of adjustable length 300 kHz X Loop insertion loss at 1 (km) (d
36、B) 2,45 35 2 3 4 5 6 7 r8 I 0,70 I 35 3,20 34 1,30 35 0.80 35 1,40 35 1,25 35 050 35 Loop # Nominal value of adjustable length 300 kHr X Loop insertion loss at (km) (dB) I 7 I 0,60 I 36 8 0,75 36 1 2 3 4 5 6 Tables 13 to 18 show ADSL performance for the downstream channel. The results are referred t
37、o the values of following specific parameters: 2,55 36 3,40 36 1,40 36 0,90 36 1,45 36 1,30 36 Nominal value of Loop # adjustable length X Loop insertion loss at 300 kHz 1 2 3 4 5 (km) (dB) 2,80 40 3,60 38 1,75 40 1 ,O5 38 1,65 38 6 7 8 1,50 38 0,70 37 1.20 38 STD-ETSI ETR 328-ENGL 177b U 3400855 OL
38、b0052 595 = Loop # Page 15 ETR 328: November 1996 Nominal value of adjustable length 300 kHz X Loop insertion loss at Loop # 1 2 3 4 5 6 7 Table 15: Loop-set insertion loss and nominal lengths for 2M2 (noise model A) Nominal value of adjustable length 300 kHz X Loop insertion loss at (km) (dB) 3,70
39、45 4,20 44 2,oo 45 1,45 44 2,05 44 1,90 44 115 AG I I I 7 . .- 8 I 1.60 I 43 Table 16: Loop-set insertion loss and nominal lengths for 2M2 (noise model B) STD.ETS1 ETR 328-ENGL L99b 3400855 OLbO053 481 Loop # Page 16 ETR 328: November 1996 Nominal value of adjustable length 300 kHz x Loop insertion
40、loss at 1 2 3 4 5 (Ian) (dB) 3,80 54 4,90 52 2,65 53 2,lO 52 2,70 53 6 I 2,55 I 53 7 1.75 54 Loop # 1 I 8 I 2,oo I 50 adjustable length 300 kHz X (km) (dB) 2.60 37 Table 18: Loop-set insertion loss and nominal lengths for 2M3 (noise model B) I I Nominal value of I Loop insertion loss at I 2 3 4 3,50
41、 37 1,55 38 1 .o0 37 5 6 7 1,65 38 1,40 37 0,70 37 I 8 I 1,20 I 37 STD-ETSI ETR 328-ENGL L77b 3400855 OLbDD54 314 50,OO 100,OO 150.00 200,OO 250,OO 300,OO 350,OO Page 17 ETR 328: November 1996 412,447 607,639 40,OO 422,302 607,631 40,OO 437,337 607,570 40,OO 456,086 607,327 40,OO 477,229 606,639 40,
42、OO 499,757 605,074 40,OO 522,967 602,046 40,OO Table 19: RLC values for 0,32 mm PE cable STD.ETS1 ETR 328-ENGL L79b 3400855 OLb0055 25q 2,50 10,OO 20,OO 30,OO 40,OO 50,OO Page 18 ETR 328: November 1996 280,007 587,075 280,ll O 586,738 280,440 586,099 280,988 585,322 281,748 584,443 282,718 583,483 T
43、able 20: RLC values for 0,4 rnrn PE cable 250,OO 300,OO I Frequency I R I L 332,348 558,233 50,OO 349,167 551,714 50,OO (kHz) I ( fUkrn) I (p Wkrn) 0.00 I 280.000 I 587.132 850,OO 900,OO 950,OO 1 000,OO 1 050,OO 1 100,OO 525,274 499,343 50,OO 539,320 496,197 50,OO 553,064 493,252 50.00 566,521 490,4
44、94 50,OO 579,705 487,908 50,OO 592,628 485,481 50,OO 50,00 50,00 50.00 50,00 50,00 50,00 50,00 50,00 50.00 Page 19 ETR 328: November 1996 Frequency (kHz) 0.00 Table 21 : RLC values for 0,5 mm PE cable R L C (Wkm) (pH/km) (nF/km) 179,000 673.574 50.00 230 10,OO 179,015 673,466 50,OO 179,244 672,923 5
45、0,OO Page 20 ETR 328: November 1996 (kHz) 0,oo Table 22: RLC values for 0,63 mm PE cable Frequency I R I L I C I ( Wkm) (pWkm) (nWkm) 1 13,000 699,258 45,OO 300,OO 350,OO 222,961 580,960 45,OO 239,764 571,691 45.00 STD-ETSI ETR 328-ENGL L77b m 3g00855 Ulb0058 Tb3 m (kHr) - 0,oo Page 21 ETR 328: Nove
46、mber 1996 ( Wkm) (pHkm) (nFkm) 55,000 750,796 40,OO Table 23: RLC values for 0,9 mm PE cable 2,50 10,oo 20,oo I Frequency I R I L I C 1 55,088 745,504 40,OO 56,361 731,961 40,OO 59,941 71 6,775 40,OO I I I I STD.ETS1 ETR 328-ENGL Lb m 3900855 Olb0059 TT m Transport class 2M3 configuration Page 22 ET
47、R 328: November 1996 Nominal value of adjustable length X of Loop #1 Loop insertion loss at 300 kHz (km) (dB) 7 ADSUPOTS splitter impedances 1 The design impedance for the POTS port of the splitter is application specific and therefore outside the scope of this ETR. Of particular importance are retu
48、rn loss and consequential sidetone levels. It is expected that some n x 2 048 kbis applications will require that the splitter matches to a complex telephony impedance. 4,35 I 62,O NOTE: Significant differences may exist between particular applications; examples are: - telephony impedances; - teleph
49、ony return loss; - out of (POTS) band signalling systems (e.g. subscriber private metering at 11 to 50 kHz); - low frequency telemetry. 8 Testing Performance testing is outlined in clause 15 of ANSI T1.413 l. NOTE: Differences exist here with respect to the crosstalk noise sources (see subclause 5.2 of this ETR) and the test loops (see clause 6 of this ETR), and the addition of a maximum stress linearity test (see subclause 8.1 of this ETR). Further details appr
