3M Dynatel 965AMS Manuale utente
February 2009
78-8140-2658-5-A
Future-Proof Testing Platform
3
Dynatel™Advanced Modular System 965AMS
30-Megahertz Spectrum Analyzer
DSL User’s Guide
2
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
3
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
Contents
DSL (Digital Subscriber Line) ..........................................................5
DSL Loss ..................................................................................................5
DSL Noise.................................................................................................9
DSL Spectrum Analyzer .........................................................................13
Resistance Balance..................................................................................17
DSL Impulse Noise.................................................................................19
4
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
5
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
DSL (Digital Subscriber Line)
The DSL functions include: DSL Loss, DSL Noise, DSL
Spectrum Analyzer, Resistive Balance, and DSL Impulse Noise.
DSL>DSL Loss
Use DSL Loss function to measure the amount of loss in a
circuit at a specific frequency. This is typically accomplished
by sending tone with another 965AMS, a 3M™Dynatel™Far
End Device (FED), or test equipment that is capable of sending
wideband tone from 20 kHz to 30 MHz.
DSL>DSL Loss>Hook-Up
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6
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
DSL>DSL Loss>Operation
1. Press the blue DSL key
to enter the DSL function.
Use the up and down arrow
keys to select DSL Loss.
Use a tone source at the
far end that is capable of
sending a known output
level such as a 965AMS.
Use 0dBm as the output
level or follow your method
of test.
2. Press DSL Setup to select
the type of service.
3. Use the up and down
arrow keys to select the
type of service that you are
measuring.
4. Press OK when finished.
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3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
DSL>DSL Loss>Operation
5. Press OK to make the
measurement.
6. The results of the
measurement will be
displayed as a –dBm level
at a specific frequency.
DSL>DSL Loss>Application Notes
DSL Loss measures the signal lost from a tone transmitter
(965AMS, 3M™Dynatel™Far End Device (FED) or other
capable device) to the measuring 965AMS.
High loss is an indication of:
1. A loop that is too long for the potential service.
2. Bridge tap.
To get a complete picture of loss, it is recommended that you use
a FED that will generate a sweep of frequency for the service
type. The sweep will indicate either a good circuit, high loss or
dips in the reading can be an indication of bridge tap. The image
8
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
below is a sweep that was performed with a 965AMS, a 3M™
Dynatel™Far End Device FED II and the selected service was
ADSL2.
Look at the before and after for these two readings. When
the bridge tap is removed then the slope no longer displays
frequency dips.
With 500 feet of bridge tap With bridge tap removed
9
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
DSL>DSL Noise
Use DSL Noise function to measure the Longitudinal or
Metallic Noise on a DSL line.
DSL>DSL Noise>Hook-Up
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DSL>DSL Noise>Operation
1. Press the blue DSL key
to enter the DSL function.
Use the up and down arrow
keys to select DSL Noise.
2. Press DSL Setup to select
the type of service.
10
3M™Dynatel™Advanced Modular System 965AMS 30-MHz Spectrum Analyzer
DSL>DSL Noise>Operation
3. Use the up and down
arrow keys to select the
type of service that you are
measuring.
4. Press OK when finished.
5. Press OK to start the
measurement for DSL
noise.
6. Press Select Longitudinal to
measure longitudinal noise.
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