TECHNICAL REPORT
`
`DSL Forum TR-031
`
`ADSL ANSI T1.413-1998
`Conformance Testing
`
`March 2000
`
`Notice:
`The DSL Forum is a non-profit corporation organized to create guidelines for DSL network system
`development and deployment. This Technical Report is a draft, and has not been approved by members of
`the Forum. Even if approved, this document is not binding on the DSL Forum, any of its members, or any
`developer or service provider involved in DSL. The document is subject to change, but only with approval
`of members of the Forum.
`
`©2000 Digital Subscriber Line Forum. All Rights Reserved.
`DSL Forum technical reports may be copied, downloaded, stored on a server or otherwise re-distributed
`in their entirety only.
`
`Notwithstanding anything to the contrary, the DSL Forum makes no representation or warranty, expressed
`or implied, concerning this publication, its contents or the completeness, accuracy, or applicability of any
`information contained in this publication. No liability of any kind shall be assumed by the DSL Forum as a
`result of reliance upon any information contained in this publication. the DSL Forum does not assume any
`responsibility to update or correct any information in this publication.
`
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`otherwise any express or implied license or right to or under any patent, copyright, trademark or trade
`secret rights which are or may be associated with the ideas, techniques, concepts or expressions
`contained herein.
`
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`
`Table of Contents
`
`1.
`2.
`
`3.
`
`4.
`
`2.1
`
`Introduction...............................................................................................................................................5
`Test Format................................................................................................................................................5
`Overview................................................................................................................................................5
`Electrical Parametric Tests......................................................................................................................7
`Scope .....................................................................................................................................................7
`3.1
`Test # 3.001 ..........................................................................................................................................8
`3.2
`Test # 3.002 ........................................................................................................................................12
`3.3
`Test # 3.003 ........................................................................................................................................17
`3.4
`Test # 3.004 ........................................................................................................................................20
`3.5
`Test # 3.005 ........................................................................................................................................23
`3.6
`Test # 3.006 ........................................................................................................................................26
`3.7
`Test # 3.007 ........................................................................................................................................29
`3.8
`Test # 3.008 ........................................................................................................................................31
`3.9
`3.10 Test # 3.009 ........................................................................................................................................33
`Initialization Tests based on ANSI T1.413-1998.................................................................................35
`Test Setups ..........................................................................................................................................35
`4.1
`Test Setup 1 ...............................................................................................................................35
`4.1.1
`Test Setup 2 ...............................................................................................................................36
`4.1.2
`Test Setup 3 ...............................................................................................................................36
`4.1.3
`Test Setup 4 ...............................................................................................................................37
`4.1.4
`Test Setup 5 ...............................................................................................................................37
`4.1.5
`4.2
`ATU-R Initialization Tests.................................................................................................................38
`4.2.1
`Activation and Acknowledgement ........................................................................................38
`4.2.1.1 Test # 4.001............................................................................................................................39
`4.2.1.2 Test # 4.002............................................................................................................................40
`4.2.1.3 Test # 4.003............................................................................................................................42
`4.2.2
`Transceiver Training ..............................................................................................................43
`4.2.2.1 Test # 4.004............................................................................................................................44
`4.2.2.2 Test # 4.005............................................................................................................................46
`4.2.2.3 Test # 4.006............................................................................................................................48
`4.2.2.4 Test # 4.007............................................................................................................................49
`4.2.2.5 Test # 4.008............................................................................................................................50
`4.2.2.6 Test # 4.009............................................................................................................................51
`4.2.3
`Channel Analysis......................................................................................................................52
`4.2.3.1 Test # 4.010............................................................................................................................53
`4.2.3.2 Test # 4.011............................................................................................................................54
`4.2.3.3 Test # 4.012............................................................................................................................55
`4.2.3.4 Test # 4.013............................................................................................................................56
`4.2.3.5 Test # 4.014............................................................................................................................57
`4.2.3.6 Test # 4.015............................................................................................................................58
`4.2.3.7 Test # 4.016............................................................................................................................60
`4.2.3.8 Test # 4.017............................................................................................................................61
`4.2.3.9 Test # 4.018............................................................................................................................62
`4.2.4
`Exchange....................................................................................................................................63
`4.2.4.1 Test # 4.019............................................................................................................................64
`4.2.4.2 Test # 4.020............................................................................................................................65
`4.2.4.3 Test # 4.021............................................................................................................................66
`4.2.4.4 Test # 4.022............................................................................................................................67
`4.2.4.5 Test # 4.023............................................................................................................................68
`4.2.4.6 Test # 4.024............................................................................................................................69
`4.2.4.7 Test # 4.025............................................................................................................................70
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`4.2.4.8 Test # 4.026............................................................................................................................71
`4.2.4.9 Test # 4.027............................................................................................................................72
`4.2.4.10
`Test # 4.028........................................................................................................................73
`4.2.4.11
`Test # 4.029........................................................................................................................74
`4.2.4.12
`Test # 4.030........................................................................................................................75
`4.2.4.13
`Test # 4.031........................................................................................................................76
`4.2.4.14
`Test # 4.032........................................................................................................................77
`4.2.4.15
`Test # 4.033........................................................................................................................78
`4.2.4.16
`Test # 4.034........................................................................................................................79
`4.2.4.17
`Test # 4.035........................................................................................................................80
`ATU-C Initialization Tests.................................................................................................................81
`4.3
`4.3.1
`Activation and Acknowledgement ........................................................................................81
`4.3.1.1 Test # 4.036............................................................................................................................82
`4.3.1.2 Test # 4.037............................................................................................................................83
`4.3.1.3 Test # 4.038............................................................................................................................84
`4.3.1.4 Test # 4.039............................................................................................................................85
`4.3.1.5 Test # 4.040............................................................................................................................86
`4.3.2
`Transceiver Training ..............................................................................................................88
`4.3.2.1 Test # 4.041............................................................................................................................89
`4.3.2.2 Test # 4.042............................................................................................................................90
`4.3.2.3 Test # 4.043............................................................................................................................91
`4.3.2.4 Test # 4.044............................................................................................................................92
`4.3.2.5 Test # 4.045............................................................................................................................93
`4.3.2.6 Test # 4.046............................................................................................................................94
`4.3.2.7 Test # 4.047............................................................................................................................95
`4.3.2.8 Test # 4.048............................................................................................................................96
`4.3.2.9 Test # 4.049............................................................................................................................97
`4.3.2.10
`Test # 4.050........................................................................................................................98
`4.3.2.11
`Test # 4.051........................................................................................................................99
`4.3.2.12
`Test # 4.052......................................................................................................................100
`4.3.3
`Channel Analysis....................................................................................................................101
`4.3.3.1 Test # 4.053..........................................................................................................................102
`4.3.3.2 Test # 4.054..........................................................................................................................103
`4.3.3.3 Test # 4.055..........................................................................................................................104
`4.3.3.4 Test # 4.056..........................................................................................................................105
`4.3.3.5 Test # 4.057..........................................................................................................................107
`4.3.3.6 Test # 4.058..........................................................................................................................108
`4.3.3.7 Test # 4.059..........................................................................................................................109
`4.3.4
`Exchange..................................................................................................................................110
`4.3.4.1 Test # 4.060..........................................................................................................................111
`4.3.4.2 Test # 4.061..........................................................................................................................112
`4.3.4.3 Test # 4.062..........................................................................................................................114
`4.3.4.4 Test # 4.063..........................................................................................................................115
`4.3.4.5 Test # 4.064..........................................................................................................................116
`4.3.4.6 Test # 4.065..........................................................................................................................117
`4.3.4.7 Test # 4.066..........................................................................................................................119
`4.3.4.8 Test # 4.067..........................................................................................................................120
`4.3.4.9 Test # 4.068..........................................................................................................................122
`4.3.4.10
`Test # 4.069......................................................................................................................123
`4.3.4.11
`Test # 4.070......................................................................................................................124
`4.3.4.12
`Test # 4.071......................................................................................................................125
`4.3.4.13
`Test # 4.072......................................................................................................................126
`4.3.5
`ATU-C State Transitions ......................................................................................................127
`4.3.5.1 Test # 4.201..........................................................................................................................128
`
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`4.3.5.2 Test # 4.202..........................................................................................................................129
`4.3.5.3 Test # 4.203..........................................................................................................................130
`4.3.5.4 Test # 4.204..........................................................................................................................131
`4.3.5.5 Test # 4.205..........................................................................................................................132
`4.3.5.6 Test # 4.206..........................................................................................................................133
`4.3.5.7 Test # 4.207..........................................................................................................................134
`4.3.5.8 Test # 4.208..........................................................................................................................136
`4.3.5.9 Test # 4.209..........................................................................................................................137
`4.3.6
`ATU-R State Transitions ......................................................................................................138
`4.3.6.1 Test # 4.210..........................................................................................................................139
`4.3.6.2 Test # 4.211..........................................................................................................................140
`4.3.6.3 Test # 4.212..........................................................................................................................141
`4.3.6.4 Test # 4.213..........................................................................................................................142
`4.3.6.5 Test # 4.214..........................................................................................................................143
`4.3.6.6 Test # 4.215..........................................................................................................................144
`4.3.6.7 Test # 4.216..........................................................................................................................145
`4.3.6.8 Test # 4.217..........................................................................................................................146
`4.3.6.9 Test # 4.218..........................................................................................................................147
`ATM Cell Specific Functionalities (ATM Cell-TC Layer) ...............................................................148
`Test # 5.001 ......................................................................................................................................149
`Test # 5.002 ......................................................................................................................................151
`Test # 5.003 ......................................................................................................................................153
`Test # 5.004 ......................................................................................................................................155
`Test # 5.005 ......................................................................................................................................156
`Test # 5.006 ......................................................................................................................................157
`Test # 5.007 ......................................................................................................................................158
`Test # 5.008 ......................................................................................................................................160
`
`5.1
`5.2
`5.3
`5.4
`5.5
`5.6
`5.7
`5.8
`
`5.
`
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`

`
`ADSL ANSI T1.413-1998
`Conformance Testing
`
`1. Introduction
`
`This document defines tests to verify an ADSL modem U interface conforms to ANSI T1.413-1998.
`These tests are organized in a hierarchical model beginning with physical media dependent measurements
`and concluding with ATM Transmission Convergence layer measurements. Section 3 lists electrical
`conformance tests for ANSI T1.413-1998, while Section 4 details initialization tests for ANSI
`T1.413-1998, and Section 5 lists tests of the ATM TC layer.
`
`2. Test Format
`
`2.1 Overview
`
`These test proposals have been developed to help vendors evaluate the compatibility of their ADSL
`products based on initialization procedures. These tests do not determine if a product conforms to an
`ADSL standard. Rather, they provide one method to isolate initialization problems within an ADSL
`device. Successful completion of all tests contained within this document does not guarantee complete
`conformance to the standards or interoperability with other ADSL devices.
`
`Organization of Tests
`The test descriptions contained in this document have been structured to simplify the execution of testing,
`ensuring consistent execution. Each test description contains a series of elements that are of an
`informational or descriptive nature. Each test contains the following:
`
`Test Number
`Specifies the number of the current test and provides a simple global identification system.
`
`Test Label
`The label associated with each test follows a hierarchical domain-naming algorithm, with subgroups
`separated by periods. More specific identifiers are located to the left; higher order identifiers are located
`to the right. For example, the “Insertion Loss” test is identified by the following label:
`
`insertion_loss.voice_band.dmt.adsl
`
`Purpose
`The purpose is a short statement that describes what the test hopes to achieve. The purpose is written at
`the functional level. For example, the purpose statement for the “Insertion Loss” test is:
`
`To measure and determine if the insertion loss, at 1004Hz, from the source to the termination
`for each of the test loops shown in figure 1 (at the end of this test) is acceptable according to
`ANSI T1.413-1998.
`
`References
`The reference section lists cross-references to the ADSL standard and other relevant documentation that
`might be useful in understanding and evaluating the test and its results.
`
`Resource Requirements
`The resource requirements section specifies the test equipment that will be needed to perform the test.
`
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`
`Discussion
`The discussion section describes what should happen during a test, and provides information necessary to
`understand the test.
`
`Test Setup
`The setup section describes what equipment was used and how it was connected. A block diagram is
`included for clarification.
`
`Procedure
`The procedure section of the test description contains the step-by-step instructions for carrying out the
`test.
`
`Observable Results
`The observable results section lists what the tester should see as a result of the test.
`
`Possible Problems
`The possible problems section describes problems that may arise and how to remedy them. This section
`is included only with tests where issues arise.
`
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`

`
`3. Electrical Parametric Tests
`
`3.1 Scope
`
`These tests are designed to ensure that no problems occur due to improper loading of the POTS splitter
`and ATU-C/R.
`
`Overview: Improper impedance matching can cause problems both with the digital data in the ADSL
`band and with the analog data in the voice band. These problems can be avoided by following the
`recommendations provided in ANSI T1.413-1998. Provided in this document are tests for the following
`voice band characteristics:
`•
`Insertion Loss
`• Attenuation Distortion
`• Delay Distortion
`• Return Loss
`• Longitudinal Balance
`• Transparent Testing Capacitance
`
`ADSL band tests included in this document are ADSL band attenuation and input impedance. A DC
`resistance test is also included in this document.
`
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`
`3.2 Test # 3.001
`
`Test Label:
`
`resistance.dc.dmt.adsl
`
`Purpose:
`To verify that the DC input impedance of the ADSL splitter at the U-R or U-C interface
`conforms to the referenced standard.
`
`References:
`
`ANSI T1.413-1998 Annex E.
`
`Resource Requirements:
`• ATU-R/C unit (UUT) with splitter (internal or external)
`• Multimeter (and necessary jumpers/connectors)
`• Function generator (and necessary jumpers/connectors)
`
`
` Discussion:
`Correct impedance levels under a variety of conditions are necessary for interoperation
`between devices. Improper impedance matching and termination can cause reflections that create noise
`and thus degrade the overall signal, to the extent that it may become impossible to interpret or distinguish
`received data.
` The DC characteristics of an ADSL device, either ATU-C or ATU-R, and corresponding splitter,
`must be consistent throughout all implementations in order for interoperability to be achieved. The DC
`input impedance of an ATU-R or ATU-C at the U-R or U-C interface, respectively, must be greater than or
`equal to 5 MW
`. In addition:
`• The DC resistance from tip to ring at the PSTN or POTS interface, with the U-C or U-R
`interface shorted, respectively, shall be less than or equal to 25W
`. This is actually just
`measurement of the resistance of the wires themselves because the splitter will be in
`parallel with a short at the U-C or U-R interface.
`• The DC resistance from tip or ring to ground at the PSTN or POTS interface, with U-C or
`U-R interface open, respectively, shall be greater than or equal to 5 MW
`.
` These requirements must be maintained for all POTS loop currents in the range 0mA to 100mA, and DC
`differential loop voltages in the range 0V to minus 60V.
`
` Test Setups:
`
`
`Setup 1. DC Ring to Ground/Tip to Ground Resistance Measurement at the PSTN/POTS Interface.
`
`.12 µF
`
`.12 µF
`
`SIG
`
`LPF
`
`xDSL
`
`PSTN/
`POTS
`Tip
`
`Ring
`
`jumpers
`
`multimeter
`multi meter
`
`DC Current/
`Voltage Source
`
`
`
`
`U-C/
`U-R
`
`Line Port
`Tip
`
`Ring
`
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`

`
`Setup 2. DC Input Resistance at the PSTN/POTS interface.
`
`xDSL
`
`PSTN/
`POTS
`Tip
`
`Ring
`
`DC Current/
`Voltage Source
`
`.12 µF
`
`.12 µF
`
`SIG
`
`LPF
`
`multi meter
`
`U-C/
`U-R
`
`Line Port
`Tip
`
`Ring
`
`
`
`
`
`Setup 3. DC Tip to Ring Resistance Measurement at the PSTN/POTS Interface.
`
`xDSL
`
`DC Current/
`Voltage Source
`
`PSTN/
`POTS
`Tip
`
`Ring
`
`multi meter
`
`.12 µF
`
`.12 µF
`
`SIG
`
`LPF
`
`U-C/
`U-R
`
`Line Port
`Tip
`
`Ring
`
`Note: Signal generator shall produce between 0mA - 100mA POTS loop currents in 10mA steps.
`
`Note: The capacitors are for the external POTS Splitter w/o the HPF function only. Internal Splitter function
`external splitters with a complete HPF function may incorporate this capacitance in the input to the HPF function.
`The D.C. blocking capacitors are optional on splitters integrated within the equipment closely associated with the
`ATU-C (i.e. DSLAM).
`
`Note: The setups shown above can be applied to both an ATU-R and an ATU-C.
`
`
`If results cannot be printed, a table is included on the last page – all results should be
`
`
` Procedure:
`recorded.
`• Connect the function generator and multimeter as shown in the first test setup.
`• Open the U-C or U-R interface.
`• Connect the jumpers appropriately and measure the DC resistance from ring to ground.
`• Reverse the jumpers and measure the DC resistance from tip to ground.
`• Connect the function generator and multimeter as shown in the second test setup.
`• Short the U-C or U-R interface.
`• Measure the DC input resistance of the UUT.
`• Connect the function generator and multimeter as shown in the third test setup.
`• Short the U-C or U-R interface.
`• Measure the DC resistance from ring to tip.
`• Repeat the procedure above varying the loop current, where applicable, in 10mA steps from
`0mA to 100mA.
`
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`
`• Repeat the procedure above generating differential DC voltages in the range 0V to minus
`60V in 5V increments.
`
`•
`
`
` Observable Results:
`• The DC resistance from tip to ground or from ring to ground, with U-C or U-R interface
`open, should be greater than or equal to 5MW
` for all loop currents in the range 0mA to
`100mA and all differential DC loop voltages in the range 0V to minus 60V.
`The DC input resistance of the UUT should be greater than or equal to 5MW
` for all loop
`currents in the range 0mA to 100mA and all differential DC loop voltages in the range 0V to
`minus 60V.
`The DC resistance from tip to ring with U-C or U-R interface shorted should be less than or
`equal to 25W
` for all loop currents in the range 0mA to 100mA and all differential DC loop
`voltages in the range 0V to minus 60V. This measurement is actually the total resistance of
`just the tip and ring wires.
`
`•
`
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`

`
`Ring to Ground (Setup 1)
`
`Tip to Ground (Setup 1)
`
`Loop Current (mA)
`0
`10
`20
`30
`
`40
`
`50
`
`60
`
`70
`
`80
`
`90
`
`100
`
`Loop Current (mA)
`0
`10
`20
`30
`
`40
`
`50
`
`60
`
`70
`
`80
`
`90
`
`100
`
`Input (Setup 2)
`
`Tip to Ring (Setup 3)
`
`Loop Current (mA)
`0
`10
`20
`30
`
`40
`
`50
`
`60
`
`70
`
`80
`
`90
`
`100
`
`Loop Current (mA)
`0
`10
`20
`30
`
`40
`
`50
`
`60
`
`70
`
`80
`
`90
`
`10
`0
`
`0 5 1
`
`0
`15
`20
`25
`30
`35
`40
`45
`50
`55
`60
`
`0 5 1
`
`0
`15
`20
`25
`30
`35
`40
`45
`50
`55
`60
`
`DC Resistance
`Pass/Fail
`
`Differential DC
`Voltage (V)
`
`DC Resistance
`Pass/Fail
`
`Differential DC
`Voltage (V)
`
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`
`3.3 Test # 3.002
`
`Test Label:
`
`insertion_loss.voice_band.dmt.adsl
`
`Purpose:
`To measure and determine if the insertion loss, at 1004Hz, from the source to the
`termination for each of the test loops shown in figure 1 (at the end of this test) is acceptable according to
`ANSI T1.413-1998.
`
`References:
`• ANSI T1.413-1998 Annex E.
`• ANSI T1.601.
`• T1 TR No. 28 (CSA Loops).
`
`
` Resource Requirements:
`• The following devices:
`• ATU-R/C unit (UUT) with splitter (internal or external)
`• CRO or Multimeter (and necessary jumpers/connectors)
`• Function generator (and necessary jumpers/connectors)
`• Two decade boxes (or 600 and 900W
` – 1% terminations)
`• The following circuit elements:
`• Seven 0.12m F – 2.5% capacitors
`• Two 0.10m F – 2.5% capacitors
`• Two 0.47mH – 5% inductor
`• Two 100W
` – 1% resistor
`• All necessary wiring tools and connectors
`
`
` Discussion:
`The insertion loss is the amount of loss added to a signal due to the addition of a splitter
`and high pass impedance (ZHP) to the system. This measurement shall be taken at a frequency of 1004Hz
`and on both the remote and central office splitters. This measurement must also be taken for each splitter
`using each of the test loops shown in figure 1, which is shown at the end of this test.
` The ZHPs are actually xDSL band terminations implemented to facilitate testing of the splitter
`independently of the modem. The circuit diagrams of the ZHPs, for both the remote and central office
`splitters, are shown in Test setups 1 and 2. The ZHPs can only be added if the splitter is external to the
`modem. Assume that internal splitters have been properly terminated.
` To properly measure the insertion loss, a measurement must first be taken without the splitter
`and ZHP connected. This measurement can then be compared to the same measurement taken with the
`splitter and ZHP connected to find the insertion loss. When testing the voice band of a remote or CO
`splitter, it is important to terminate the connections properly (improper termination causes reflections,
`etc. as discussed in Test 3.001) The voice band of a remote splitter should be terminated with an
`impedance of 600W
` and the voice band of a CO splitter should be terminated with an impedance of 900W
`.
` The tolerances for insertion loss are shown in the table below.
`
` ZTc =