1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0600026.2010(R2015) Network End POTS Splitter Requirements As a leading technology and solutions development organization, the Alliance for Telecommunications Industry Solutions (ATIS) brings together the top global ICT companies to advance the
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4、American National Standards Institute (ANSI). The organization is the North American Organizational Partner for the 3rd Generation Partnership Project (3GPP), a founding Partner of the oneM2M global initiative, a member of and major U.S. contributor to the International Telecommunication Union (ITU)
5、, as well as a member of the Inter-American Telecommunication Commission (CITEL). For more information, visit www.atis.org. AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval h
6、ave been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unani
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8、rom manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall
9、 have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: Thi
10、s American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all
11、 standards by calling or writing the American National Standards Institute. Notice of Disclaimer however such features and performance characteristics are beyond the scope of this document. 1.2 Purpose This standard is intended to facilitate the provisioning of various digital subscriber line (DSL)
12、technologies and voice-band services over the same loop. The document is written broadly to permit the splitter to be used for current DSL technologies and potential new DSL technologies that use the same frequency spectra. 1.3 Other Considerations Network systems apply various electrical signals to
13、 the subscriber loop for the purpose of network maintenance and alerting the customer of an incoming call. These signals vary considerably in amplitude and can reach values of -/+ 200Vdc for maintenance functions and 276.2 volts peak for alerting signals. When these signals are applied to an access
14、line that also has a Network End POTS ATIS-0600026.2010 2 splitter in series with the subscriber loop, the low pass section of the splitter may see the full magnitude of these signals. Therefore consideration should be given to the selection of circuit components used for the splitter design. During
15、 the times these signals are applied, it is acceptable that the low pass filter does not perform all of its functions nor meet the all of the technical requirements in this document. However the filter components should not be permanently damaged. Such phenomena as lightning and over voltage due to
16、inductive interference or power cross lie beyond the scope of this Technical Requirements document. The detailed technical parameters of the network maintenance and alerting signals referenced here can be found in the references in Section 2. 2 NORMATIVE REFERENCES The following standards contain pr
17、ovisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investi
18、gate the possibility of applying the most recent editions of the standards indicated below. 1. ATIS-0600413.2009- Network and Customer Installation Interfaces Asymmetrical Digital Subscriber Line (DSL) Metallic Interface, ATIS, 20091. 2. ITU-T G.992.3 Asymmetric Digital Subscriber Line (ADSL) transc
19、eivers, 2005. 23. ITU-T G.992.5 Asymmetric Digital Subscriber Line (ADSL) transceivers Extended bandwidth ADSL2 (ADSL2plus), 2005.24. ITU-T G.993.2 Very High Speed Digital Subscriber Line transceivers 2 (VDSL2), 2006.25. Telcordia Technologies GR-57-CORE Issue: 01 2001-10-19, Functional Criteria for
20、 Digital Loop Carrier Systems36. Telcordia Technologies GR-507-CORE Issue: 01 2000-06-30, Section 7 - Transmission Requirements and Objectives of the LATA Switching Systems Generic Requirements (LSSGR)37. IEEE Standard 743 - IEEE Standard Equipment Requirements and Measurement Techniques for Analog
21、Transmission Parameters for Telecommunications, 1995.48. IEEE Standard 455 - IEEE Standard Test Procedure for Measuring Longitudinal Balance of Telephone Equipment Operating in the Voice Band, 1985 or later.41This document is available from the Alliance for Telecommunications Industry Solutions (ATI
22、S), 1200 G Street N.W., Suite 500, Washington, DC 20005. 2This document is available from the International Telecommunications Union. 3Telcordia documents are available from Industry Direct Sales, Telcordia, 8 Corporate Place, PYA 3A-184,Piscataway,NJ,08854-4156,or: . 4This document is available fro
23、m the Institute of Electrical and Electronics Engineers (IEEE). ATIS-0600026.2010 3 3 DEFINITIONS, ACRONYMS, gain is negative value. Table 2 - Increase in Attenuation Distortion in Voice Band 0.2 - 3.4 kHz 3.4 - 4.0 kHzShort loop Splitter ZTc = 900 ZTr = 600 +1.5 -1.5 +2.0 -2.0 Long loop Splitter ZT
24、c = 900 ZTr = 600 +0.5 -1.5 +1.0 -1.5 Figure 7 defines the test configuration and the value of the test components that shall be used for transmission measurements in the voice band for the splitter. LPFTestLoopZTc(900ohm)TestEq uipm entZHP-c(load)ZTr(600ohm)PSTN U-C U-RSIGCO POTS Splitter0.12uF *ZT
25、c is the NormalTermination in TestSetDSLFigure 7 - Transmission Measurements in Voice Band for the Splitter NOTES: ZTc = 900 ohm. ZTr = 600 ohm. ZHP-C is the impedance presented to the PSTN connection by a TU-C through the capacitance of the splitter DC blocking capacitors. (*) These capacitors are
26、only for the external splitter without the HPF function. Internal splitter function or external splitters with a complete HPF function may incorporate this capacitance in the input to the HPF function. ATIS-0600026.2010 10 4.7.1.4 Envelope Delay Distortion The envelope delay distortion of the splitt
27、er shall be measured using Figure 7 The increase in delay distortion caused by the splitter as measured from the PSTN port to the U-R interface, for each of the test loops shall be less than the values in Table 3. Table 3 - Increase in Envelope Delay Distortion 0.6 - 3.2 kHz 0.2 - 4.0 kHzShort loop
28、Splitter ZTc = 900 ZTr = 600 200 usec 250 usec Long loop Splitter ZTc = 900 ZTr = 600 200 usec 250 usec 4.7.1.5 Return Loss Figure 8 defines the test configuration and the value of the test components that shall be used for impedance measurements in the voice band for the splitter unit. Return Loss
29、measurements shall be made in accordance with IEEE 743 7. LPFSIGZHP-c600OhmTest EquipmentZNL-cPOTS Splitter at COPSTN U-C0.12 uF. *(used only at COtermination)DSLReturn loss referenceimpedanceTermination(Use real OSP cableor a DSL linesimulator)Figure 8 - Splitter Return Loss Set Up NOTES 1. ZNL c =
30、 800 ohm in parallel with the series connection of a 100 ohm resistor and a 50 nF capacitor (non-loaded loop model seen from CO). This value comes from the Telcordia LSSGR as a reference compromise impedance for non loaded cable. 2. ZHP-C is the impedance presented to the PSTN connection by a TU C t
31、hrough the capacitance of the Line-sharing splitter DC blocking capacitors. ATIS-0600026.2010 11 3. (*) These capacitors are for the external Line-sharing splitter without the HPF function only. Internal Splitter function or external splitters with a complete HPF function may incorporate this capaci
32、tance in the input to the HPF function. The Echo Return Loss (ERL), Singing Return Loss Low (SRL-L), Singing Return Loss High (SRL-H), and Single Frequency Return Loss (SFRL) shall exceed the values given in Table 4. See IEEE 743-1995 7, Section 8.4. Table 4 - Return Loss Zref Zterm ERL (dB) SRL-L (
33、dB) SRL-H (dB) SFRL from 2.2-3.4 kHz (dB) Splitter ZNL-c 600 ohm 8 5 5 2 dB 4.7.1.6 Intermodulation Distortion The IMD performance of the Network End splitter should be ensured by testing the DSL end-end performance with and without the Network End splitter inserted. The DSL performance degradation
34、from inserting the Network End splitter should be minimal. DSL performance degradation may be due to a variety of characteristics besides IMD such as insertion loss and/or spectral shaping. Attempts to perform traditional 2-tone IMD testing have proven to be very challenging. It was determined that
35、devising a test set to measure IMD performance accurately with standard components in a repeatable fashion would be extremely difficult. It is recommended to use Broadband Forum TR-127, “Dynamic Testing of Splitters and In-Line Filters with xDSL Transceivers”, Section 8.10 (Data Rate Performance) to
36、 validate IMD performance. 4.7.2 Longitudinal Balance of Splitter The longitudinal balance of the splitter can be measured using two different techniques. One technique would be to treat the splitter as a separate entity that would require using the 2 PORT testing technique. The other technique that
37、 can be used to test the splitter would be to treat it, the TU-C and line card combination as a one-port network. This one-port network would require using the 1 PORT testing technique. Tests should be made according to IEEE 455 8. 4.7.2.1 Longitudinal Balance of Splitter using 2 PORT Testing Techni
38、que This method shall be used to test a splitter when it is treated as a separate entity. The longitudinal balance of the splitter (without loops) measured in either direction between the PSTN and line port, as a two-port device, shall be measured in accordance with IEEE Standard 455 8. In the case
39、where DC blocking capacitors are included as part of the splitter function on the DSL port, the DSL port will be shorted. Otherwise the DSL port shall be open. Because of the maintenance signatures, the applied longitudinal voltage shall be maximum 3.0 V p-p. The balance shall be greater than 58 dB
40、for frequencies between 200 Hz 1 kHz with a straight-line level decreasing to 53 dB at 3 kHz. The requirements shall be met at all DC bias currents between 25mA and 100 mA. The termination of the test set is set for series balance measurement per IEEE 455 8. Prior to testing, a test circuit balance
41、(calibration) of 77 dB (58 + 19 dB) shall be achieved to ensure 1dB accuracy. Figure 9 shows the test setup for the external splitter. The DSL port is shorted. If testing longitudinal balance on an integrated modem, the TU-C shall be connected but powered down. ATIS-0600026.2010 12 LPF S I G DSL Por
42、t PSTN 0.12 uF 0.12 uF Line Port Shorted LB Test Source LB Test Load Figure 9 - Longitudinal Balance CO Test Setup per IEEE 455 8 4.7.2.2 Longitudinal Balance of Splitter using One Port Testing Technique This method shall be used to test a splitter when the splitter, TU-C and line card combination i
43、s treated as a one-port network. The longitudinal balance of the combined splitter, TU-C and Line card (without loops) shall be measured in accordance with IEEE Standard 455 8. Because of the maintenance signatures, the applied longitudinal voltage shall be maximum 3.0 V p-p. A suitable 130 to 1300
44、Ohm variable DC hold circuit shall be used to sink DC current from the 1 port assembly at the line port. The balance shall be greater than 52 dB for the frequencies between 200 Hz to 3.0 kHz. Requirements shall be met at all currents between 25 mA and 100 mA. Prior to testing, a test circuit balance
45、 (calibration) of 71 dB (52+ 19 dB) shall be achieved to ensure 1dB accuracy. Figure 10 shows the test setup for the combined splitter, TU-C and line card combination one-port network. Figure 10 - Longitudinal Balance CO Test Set-up for One-Port Network per IEEE 455 8 4.7.3 Transparent Testing Capac
46、itance To minimize the effect of the splitter on the performance of metallic loop test systems, the input impedance is defined for a special narrow frequency band. 4.7.3.1 Tip to Ring Capacitance The intent of this requirement is to limit the maximum capacitance seen by metallic line testing systems
47、. By setting this limit the metallic test systems can still test PSTN services with the accuracy and dependability they have today. ATIS-0600026.2010 13 Overall the admittance of the PSTN port shall be capacitive. The capacitance present at the PSTN interface in the frequency range of 20 30 Hz shall
48、 be a maximum of 300 nF. This amount includes the combined total capacitance due to the two splitters at the network end and the remote end with attached modems. The following maximum / minimums shall be met: Splitter without the modem connected: 115 nF Max 20 nF Min Modem input allowance, including
49、 the DC blocking capacitors at the CO end: 35 nF Max 20 nF Min Modem with integral splitter function or external splitter with both HPF and LPF functions, are the sum of the above: 150 nF Max 40 nF Min Figure 11 - Capacitance Test 4.7.3.2 Capacitance to Ground There should be no designed AC path to ground. In order to maintain the ability to test accurately the maximum stray capacitance-to-ground from either leg of the splitter shall be less than 1.0 nF. 4.8 DSL Band Testing The start and stop frequencies for testing in the DSL
