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

• 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.

Printed in U.S.A. 6/2003 2091603 A-ENG-N Rev A

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