5-1
Chapter 5
XDSL Testing and Loop Qualification
Introduction
The tests described in this chapter can help you determine a cable pair’s ability
to carry modern high-speed digital services.
The chapter begins by showing you how to set up and run a DSL Auto-Test.
Like the POTS Auto-Test, the DSL Auto-Test contains a series of individual
tests. However, the DSL Auto-Test is a double-ended test, requiring a far-end
terminating device. As a general practice, you can use this Auto-Test to obtain
a quick overall assessment of the transmission capabilities of a cable and its
suitability for various grades of service. You are then instructed on how to run
a DSL Modem Test, which uses the Fluke Networks 990-GM/2 (ADSL2+) or
990-GM/V (VDSL2) Golden Modem appliqué to connect with a working
ADSLx or VDSLx DSLAM and provide line transmission statistics.
The second half of this chapter focuses on the individual tests in the XDSL
Toolbox. This toolbox contains both single-ended physical parametric tests
and double-ended wideband and broadband transmission tests. As a group, the
tests in the XDSL Toolbox are useful for identifying the presence of line
trouble that can disqualify a pair from carrying a particular digital service.
Additionally, the tests can help you determine the maximum service data rate
that a pair is capable of carrying.
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