1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0600016.2008(R2013) Remote End POTS Splitter Requirements As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the industrys most-pressing business priorities. Through ATIS
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11、a, Digital Systems and Networks, Digital transmission systems - Access networks, Very high speed digital subscriber line transceivers 2 (VDSL2)410 ATIS-0600601.1999(R2009) - Integrated Services Digital Network (ISDN) Basic Access Interface for Use on Metallic Loops for Application on the Network Sid
12、e of the NT (Layer 1 Specification).111 T1.TR.28-1994, High-Bit-Rate Digital Subscriber Line (HDSL).11This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005. 2This document is available from the Institute of
13、Electrical and Electronics Engineers (IEEE). 3Telcordia documents are available from Industry Direct Sales, Telcordia, 8 Corporate Place, PYA 3A-184,Piscataway,NJ,8854-4156,or: . 4This document is available from the International Telecommunications Union. ATIS-06000016.2008 3 3 DEFINITIONS, ACRONYMS
14、, voice band and DSL band. Testing shall not be performed in the transition band. The transition band is defined between 4 kHz and Fmin, where Fmin is defined per Table 7. However, it is expected that the LPF shall be well behaved in this area (i.e., the amplitude response is monotonically decreasin
15、g from 4 kHz to Fmin) 4.2.2 Balanced Terminations All testing shall be done in a BALANCED (i.e. metallic) method. Test equipment with unbalanced connections may be used as long as the resultant measurement maintains balance. Balun transformers are often used on test equipment with unbalanced connect
16、ions. 4.3 ZHP-r and ZNL-r Impedances Defined To facilitate testing of the DSL splitter independently of the actual modem or specific vendor, ZHP-r is defined to allow proper termination of the DSL port during voice band testing for the splitter at the remote customer end. (See Figure 6) The ZHP-r is
17、 valid only for voice band frequencies. ZNL-r is defined as lumped impedance models of loops for remote end splitter design. The requirements for ZNL-r are shown in Figure 7. ATIS-06000016.2008 8 0.10 F 0.12 F0.10 F 0.12 F0.47 mH100 OhmComponent Tolerances Capacitors = 2.5%, Resistors = 1%, Coils =
18、5% Figure 6: ZHP-r of DSL port termination for voice band testing 100 nF348 Ohm1330 OhmComponent Tolerances Capacitors = 2.5%, Resistors = 1% Figure 7: ZNL-r of POTS Port Termination for Voice Band Testing 4.4 MAINTENANCE TEST SIGNATURES (MTS) If the maintenance test signatures are provided for the
19、remote end splitter, they shall be as shown in Figure 8. In order to allow the DSL splitter to be managed by the network operational support systems and to be identified by metallic loop test systems, the remote end DSL splitter function may contain a signature that is activated by the metallic test
20、 systems. The signature is unique for all North American remote end DSL splitters. The signature is designed to be active only during the maintenance mode and will not interfere with normal operation of the circuit. The signature is located on the POTS side of the LPF function protecting the DSL ban
21、d frequencies from the non-linear effects of the diodes. ATIS-06000016.2008 9 0.47 F, 10%33 kOhm , 1%6.8V, 10%TipRingFigure 8: Maintenance Test Signature 4.5 Signaling Requirements Unless otherwise noted, all of the requirements in this standard shall be met in the presence of all of the following:
22、POTS loop currents from 0 mA to 100 mA; POTS tip-to-ring DC voltages of 0 VDC to -60 VDC; POTS ringing signals that meet the criteria in 4.5.1. Compliance with the loop current range above may be demonstrated by meeting the requirements of this standard with loop currents of 0, 20, 40, 60, 80 and 10
23、0 mA (+/- 1 mA for all values) with a -60 VDC +/- 1 VDC source. Compliance with the DC voltage range above may be demonstrated by meeting the requirements of this standard with DC voltages of 0, -20, -40, and -60 VDC (+/- 1 VDC for all values) with 40 mA +/- 1 mA of loop current. 4.5.1 Applied Ringi
24、ng Signals For the purposes of meeting the ringing signal requirement in section 4.5, applied ringing signals shall meet the following criteria: The DC component of the ringing signal shall be between 0 VDC and -60 VDC. The AC component of the ringing signal shall be 20 Hz +/- 1 Hz. The AC component
25、 of the ringing signal shall have an open circuit voltage of 104 Vrms+/- 1 Vrms. The AC component of the ringing signal shall have a crest factor of 1.4142 +/- .01. The AC component of the ringing signal shall be applied for 2.0 seconds +/- 0.2 seconds and removed for 4 seconds +/- 0.4 seconds, then
26、 reapplied and removed for the same durations in a repeating pattern that lasts at least two minutes. Compliance with the applied ringing signal specified above may be demonstrated by meeting the requirements of this standard with the ringing signal characteristics specified above with a DC componen
27、t of 0, -20, -40, and -60 VDC (+/- 1 VDC for all values). There is no specification for AC current during ringing because the rms value is typically less than the DC current limit of 100 mA based on 104 VAC open circuit voltage and a five REN (1,400 ohm) load. During a ring trip event there is a pos
28、sibility that a large amount of current can flow through the loop for a short period of time. Since the input of the majority of DSL low pass filters is inductive, there is a high probability that this high current will saturate the magnetic material of these inductive components. When saturation oc
29、curs, the inductive components will fail to operate correctly. This can result in loss ATIS-06000016.2008 10 of data for a short period of time and can lower the quality of service for video applications. Ring trip current can reach values of up to 1.0 Arms4.5.2 DC Resistance For splitters without i
30、ntegral secondary protection, the DC resistance from tip to ring at the POTS interface with the U-R interface shorted shall be less than or equal to 25 ohms at 75 F. This requirement shall be met before and after all ring-trip events. The DC resistance from tip to ring at the POTS interface with the
31、 U-R interface open shall be greater than or equal to 5 Mohms at 50 VDC. Note: The resistance of splitters containing integral secondary protection is for further study. 4.6 Voice Band Requirements 4.6.1 Metallic Balanced (Differential Mode) 4.6.1.1 Test Loops Loops to be used for ADSL testing are d
32、ivided into two groups. This is done to obtain more specific requirements under a widely varying conditions of short and long loops and to account for the effect the opposite splitter impedances being seen through the loop and effecting performance. Short Loops: 0, 0.5 kft, 2.0 kft, 5 kft pairs of 2
33、6 AWG cables. Long Loops: ATIS-0600601 10 resistance design loops 7, 9, 13 and T1.TR.28 11 CSA loops 4, 6, 7, 8. Loops to be used for testing of VDSL splitters are defined in Section 12.1 of ATIS-0600424 4 4.6.1.2 POTS to Line Insertion Loss For each of the test loops specified in 4.6.1.1, the inser
34、tion loss from the source to the termination shall be measured with and without the splitter/ZHP combination inserted. The increase in insertion loss in the pass band on any of the test loops is due to the splitter/ZHP combination. The requirements are defined in Table 1. Figure 9 defines the test c
35、onfiguration that shall be used for all pass band insertion loss measurements for the remote end splitter. Table 1: POTS to line insertion loss requirements Splitter Loop ZTC () ZTR () Insertion loss (dB) Frequency (kHz) POTS Short ADSL Loops 900 600 6 5 3 POTS All Loops 600 N/A N/A 2 Single frequen
36、cy Test LoopLINEDSLPOTSU-CU-RPOTSRemote End POTS SplitterZHP-r(Load)ZTCTest EquipmentLPFZNL-rReturn loss referenceimpedanceNOTES ZNL-r is the impedance of the non-loaded loop model seen from the RT ZHP-r is the impedance presented to the POTS connection by a TU-R Figure 10: POTS to line return loss
37、measurement ATIS-06000016.2008 14 4.6.1.6 POTS to Line Intermodulation Distortion The intermodulation distortion contributed by the remote end splitter shall be measured using the test configuration of Figure 9 and the null loop. With an applied tone set per IEEE 743 6, at a level of -9 dBm, the sec
38、ond and third order intermodulation distortion products shall meet the requirements of Table 5. Table 5: POTS to Line Intermodulation Distortion Requirements Splitter Type Loop ZTC () ZTR () 2nd Order (dB) 3rd Order (dB)Frequency (kHz) POTS Null Loop 900 600 58 0.2 to 1.0 POTS No Loop 900 600 58 53
39、linearly decreasing 3.2 to 4.0 The termination of the test set is for a series balance measurement per IEEE Standard 455 5. Prior to testing, a test circuit balance of 77 dB (58 + 19 dB) shall be achieved to insure 1 dB of accuracy. ATIS-06000016.2008 15 Figure 11 shows the test setup for the remote
40、 end DSL splitter with the DSL port open. If testing longitudinal balance on an integrated network modem, the TU-R shall be connected but powered down. DSLLINE POTSDSL PortLB TestLoadLB TestLoadFigure 11: POTS to line longitudinal balance measurement per IEEE 455 5 4.6.3 Transparent Testing Capacita
41、nce 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. 4.6.3.1 Tip to Ring Capacitance The intent of this requirement is to limit the maximum capacitance between tip and ring of the DSL Splitter
42、 that can otherwise affect results from metallic line testing systems. Overall the admittance of the POTS or PSTN port shall be capacitive. The capacitance present at either the POTS or PSTN interfaces in the frequency range of 20 to 30 Hz shall be a maximum of 300 nF. This amount includes the total
43、 capacitance due to the two splitters at the network end and the remote end with the attached modems. The following, per end, maximum/minimums shall be met: Remote end splitter without modem connected: 115 nF Max 20 nF Min Modem input allowance: 35 nF Max 20 nF Min Multiplying the above numbers by t
44、wo (for two modems and two POTS splitters) results in 300 nF maximum tip to ring capacitance. ATIS-06000016.2008 16 DSLLINE POTSDSL Port CapacitanceFigure 12: Capacitance Measurement 4.6.3.2 Capacitance to Ground There shall be no designed AC path to ground. The maximum stray capacitance from either
45、 tip or ring of the splitter to ground shall be less than 1.0 nF. 4.7 DSL BAND TESTING The start and stop frequencies for testing in the DSL band are dependent on the technology (ADSL vs. VDSL). For VDSL2 splitters, the start and stop frequencies are dependent on the different profile options. The s
46、tart frequency is denoted Fminwill and the stop frequency is denoted Fmax. Table 7: Frequency Minimum and Maximum Splitter Type FminkHz FmaxMHz ADSL 32 1.1 ADSL2plus 32 2.2 VDSL2, 8a 32 8.5 VDSL2, 8b 32 8.5 VDSL2, 8c 32 8.5 VDSL2, 8d 32 8.5 VDSL2, 12a 32 12 VDSL2, 12b 138 12 VDSL2, 17a 138 17.7 ATIS
47、-06000016.2008 17 VDSL2, 30a 138 30 VDSL 32 12 VDSL 138 12 Note: 32 kHz is selected instead of 25.875 kHz as Fminfor DSL over POTS for splitter design considerations. 4.7.1 DSL Band Attenuation The insertion loss of the low-pass filter and ZHP (i.e., the difference in insertion loss measured with an
48、d without the filter/ZHP combination), measured as shown in Figure 13, shall meet the requirements in Table 8. The insertion loss caused by the low pass filter in the DSL band shall be measured with an input level of 10 dBm. Table 8: DSL Band Attenuation Requirements Splitter type Loop Line () ZTR (
49、) Insertion loss (dB) Frequency (kHz) POTS Null Loop 100 600 65 Fmin- 300 POTS Null Loop 100 600 55 300 - FmaxSIGLPFVmZHP-rLine PortDSL PortSource 100 ohmFmin - FmaxBalancedPOTS600 OhmFigure 13: DSL Band Attenuation Measurement 4.7.2 DSL to Line Insertion Loss The Insertion loss caused by the splitter in the DSL band between nominal impedances as shown in Figure 14 shall meet the limits defined in Table 9. The insertion loss caused by the low pass filter in the DSL band shall be measured with an input level of -10 dBm. ATIS
