Fluke CopperPro 990DSLWT Referenzhandbuch
Application Note
Using the Fluke Networks 990DSLWT
CopperPro for qualifying a POTS telephone
pair for ADSL service includes three basic
components:
1. Verify passive metallic properties of
the pair to carry service.
• AC and DC voltage on pair within
acceptable limits
• No open shorted or grounded
conductors
• Longitudinal, capacitive and resistive
balance within acceptable limits
• Verify pair length within acceptable
limits (<15000 ft.)
• Verify no load coils or bridge taps are
present
2. Verify noise and other interference are
within limits required to carry service.
This includes:
• Immunity to power influence
• Metallic noise
• Wideband spectral noise
3. Verify ADSL transmission
characteristics.
• Insertion loss for each DMT bin
frequency
• Signal to noise ratio for each of DMT
frequency
• Bits encoded per tone for each bin
frequency
• Estimated upstream and downstream
data rate
The procedure outlined in this paper is
based on testing an out-of-service pair and
can be performed segment-by-segment or
end-to-end. If the pair is in service, the heat
coil must be removed at the main distribu-
tion frame in the central office. This test
does not verify performance of ADSL trans-
mission equipment (DSLAM or subscriber
modem), subscriber wiring, ATM or IP
configuration.
ADSL Qualification Procedure
Equipment required:
• Two 990DSLWT CopperPro Loop Testers
• Two sets of test leads for tip, ring and
ground of each 990DSLWT
• One strapping cord (included with each
990DSLWT)
• 990DSL User Guide (for reference)
Instrument Set-up
This procedure is based on the U.S. English
set-ups (found in user options). For linear
and gauge settings in metrics, use the UK
English set-ups. For more information, con-
sult the Users Guide, Section 3.
Before testing, zero test leads on both
test sets (found in user options). For more
information, see Section 3 of the Users
Guide.
POTS Auto-Test
Tests completed:
• Opens, capacitive balance and length
• Shorts and grounds
• Load coils
• Longitudinal balance
• Voice frequency noise (power influence
and metallic noise)
Set-Ups
• Power up the test set, the POTS Auto-Test
should be highlighted
• Press the blue soft key #4 to enter the
set-up menu
• Configure the test as shown below - press
the BACK key to return to the main menu
If required, set the cable type and gauge. These
settings are found in the individual set-ups for the
Shorts and Grounds and Opens tests located in the
POTS Tool box.
• Connect the test leads to tip and ring
conductors and ground sheath. Assure that
POTS Auto-Test is highlighted and press
the TEST key
ADSL Qualification Procedure Using
CopperPro™990DSLWT
When the test is complete, summary
Pass/Fail results will be shown, similar to
this example:
Any failures will be highlighted in flashing
reverse video. To see more information about
a test, highlight the test, and press the
Details key. For capacitive length and bal-
ance results, highlight Opens test results and
press Details soft key.
Passing results:
AC Voltage < 10V
DC Voltage < 3V
Resistive Faults > 150 kohms
Capacitive Balance > 95%
Capacitive Length < 15000 ft
Longitudinal Balance > 55 dB
Metallic Noise < 30 dBrn
Power Influence < 80 dBrn
Load Coils < 1
Loop Resistance and
Resistive Balance
Tests completed:
• Measure loop resistance and balance
• Convert to loop length
Set-Ups
• Open POTS Toolbox
• Highlight Shorts and Grounds test
• Press Setups key
• Set cable gauge and estimated
temperature
• Press the BACK key to return to the POTS
Toolbox
• Using supplied strapping cord, short the
far end of the pair to ground (tip and ring
shorted together and to ground)
• At the near (test) end of the pair, connect
the 990’s tip, ring and ground leads
• Highlight the Shorts and Grounds test (in
POTS Toolbox) and press the TEST key
When the test is complete, results similar to
this example will be shown:
Verify that the tip ground and ring ground
resistances are within three ohms of one
another.
Use the Ohms to Distance function to calcu-
late pair length, shown here:
Bridgetap Detection
Tests completed:
• Identify bridge taps
• Determine number, length and distance
from subscriber
Set-Ups
• Turn on set
• Highlight TDR Auto-Test and press Setups
soft key
• Set cable gauge and type being tested
• Adjust VOP (Velocity of Propagation) as
needed. For more information, see Section
6 of the Users Guide
• Press BACK key to return to the main
menu
• Connect tip, ring and ground test leads to
the pair
• Highlight TDR Auto-Test and press TEST
When the test is complete, results similar to
this example will be shown.
If bridge taps are detected, use Cursor 1 and
Cursor to determine length and location.
Pass/fail limits:
Total bridge taps <3
Max length of longest < 2000 ft
Max length of all bridge taps < 2500 ft
Min distance from subscriber > 1000 ft
Wideband Noise
Identify any high frequency interference that
may disturb service.
Set-Ups
• Open the XDSL Toolbox
• Highlight WB Noise/Level and press the
Setups key
Verify the settings are the same as below:
• Press the BACK key to return to the
previous menu
• Highlight WB Noise/Level test
• Connect tip, ring and ground terminals
and press TEST
When the test is complete, results similar to
this example will be shown:
Verify that there are no disturbing signals
greater than -50 dBm, and that total noise
(upper right hand corner) is less than
50 dBrnG.
Pair Qualification with ADSL
Auto-Test
Tests completed:
• Simulate service
• Measure loss and noise ratio for each
DMT bin
• Estimate bits per tone and upstream and
downstream data rate
Set-Ups
• Place one CopperPro at the far end of the
pair
• Connect its tip, ring and ground leads to
the pair and sheath ground
• Turn on the unit
• Select ADSL Auto-Test and press ENTER
• Set this unit up as the Sending unit by
pressing the Sending Unit soft key
• Press TEST to activate the unit
• Connect the other CopperPro at the near
(test) end of the pair
• Select ADSL Auto-Test and press ENTER
• Set this unit as the Receiving Unit by
pressing the Receiving Unit key
• Press test
When the test is complete, results will be
similar to this example will be shown:
Verify that calculated upstream and down-
stream speeds are within guidelines for the
service being installed, usually >128 kbs
upstream and >256 kbs downstream.
Press the SNR & Bits/Tone soft key to view
data in signal-to-noise ratio and bits-per-
tone format, if desired.
If testers do not exchange tones and
display a communications error, verify that
you have continuity over the pair between
the sending and receiving units.
Support
Fluke Networks offers a variety of support
options to help you get the most from your
CopperPro. If you require technical support,
for application or operation assistance, or
for more information about the CopperPro
tester, you can email:
fluke-assist@flukenetworks.com
or call 1-800-283-5853.
Fluke Networks working
for you
CopperPro is part of our Network SuperVision
Solutions™ – a complete family of leading-
edge tools, services and training from Fluke
Networks. Our loop recovery, troubleshooting
and record management solutions are the
choice of local exchange carriers who want
to reduce held orders. Increase revenue.
Lower OSP operating expenses. Improve
workforce efficiency. Reduce OSP defects
rates. And increase customer satisfaction.
That’s Network SuperVision™. And it’s yours
only from Fluke Networks.
Fluke Networks
P.O. Box 777, Everett, WA USA 98206-0777
Fluke Networks operates in more than 50 countries
worldwide. To find your local office contact details, go
to www.flukenetworks.com/contact.
©2003 Fluke Corporation. All rights reserved.
Printed in U.S.A. 6/2003 2091603 A-ENG-N Rev A
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