6. ii DSAM Field View QAM Guide Rev. 001
It is the responsibility of the equipment owner to return the equipment
to JDSU for appropriate disposal. If the equipment was imported by a
reseller whose name or logo is marked on the equipment, then the
owner should return the equipment directly to the reseller.
Instructions for returning waste equipment to JDSU can be found in
the Environmental section of JDSU’s web site at www.jdsu.com. If you
have questions concerning disposal of your equipment, contact
JDSU’s WEEE Program Management team at
WEEE.EMEA@jdsu.com.
7. Rev. 001 DSAM Field View QAM Guide iii
Table of Contents
Field View QAM™ Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Field View QAM™ - Troubleshooting with Field View QAM™ . . 2
DSAM Field View QAM™- Example of Detected Problems . . . . . 8
9. DSAM Field View QAM Guide
Field View QAM™ Overview
Rev. 001 DSAM Field View QAM Guide 1
Field View QAM™ Overview
Locate and Repair hard-to-find impairments on the Return Path. Tradi-
tional spectrum analysis tools can show a clean spectrum, indicating
pristine return path, while the CMTS and other reporting tools give
overall node health a low health score. With Field View QAM™ micro-
reflections, in-band frequency response and group delay issues that
are undetectable when viewing only the spectrum can be quickly iden-
tified.
A DSAMXT with Field View QAM™ can display an impairment dash-
board with key measurements displayed in green and red providing a
quick go/no-go indicator to technicians, confirming whether issues
causing codeword errors such as microreflections and impulse noise
have been fixed.
3
9
Figure 1 ImpairmentsInvisiblewithSpectrumAnalysis
Figure 2 Same Impairments Visible with Field View QAM
10. DSAM Field View QAM Guide
Field View QAM™ - Troubleshooting with Field View QAM™
2 DSAM Field View QAM Guide Rev. 001
Field View QAM™ - Troubleshooting with Field View QAM™
1 Press the Measure hard key on the DSAM keypad.
2 Press the Service softkey
3 Got to Field View QAM™
4 Enter
5 If you have multiple DOCSIS Channels available to test you will be
asked to select a DOCSIS Channel
6 Select a DOCSIS channel that you want to troubleshoot
7 Press Next>
Figure 3
Figure 4
11. DSAM Field View QAM Guide
Field View QAM™ - Troubleshooting with Field View QAM™
Rev. 001 DSAM Field View QAM Guide 3
8 Press Start>
9 Select a PathTrak WebView Server
10 Ok
11 Select an HCU
12 Ok
13 Select a Node
14 Ok
15 Select an upstream
16 Ok
Figure 5
Figure 6
12. DSAM Field View QAM Guide
Field View QAM™ - Troubleshooting with Field View QAM™
4 DSAM Field View QAM Guide Rev. 001
Figure 7
Figure 8 Initial FVQ Screen
13. DSAM Field View QAM Guide
Field View QAM™ - Troubleshooting with Field View QAM™
Rev. 001 DSAM Field View QAM Guide 5
17 Select Carrier Level
18 Enter
19 Press the Back softkey
20 Using the down arrow key, select In-Band Response
21 Go Back
Figure 9 Carrier Level
Figure 10 In-Band Response
14. DSAM Field View QAM Guide
Field View QAM™ - Troubleshooting with Field View QAM™
6 DSAM Field View QAM Guide Rev. 001
22 Select Ingress Under Carrier
23 Back
24 Using the arrow keys, select Micro-reflection
25 Back
Figure 11 Ingress Under Carrier
Figure 12 Micro-reflection
15. DSAM Field View QAM Guide
Field View QAM™ - Troubleshooting with Field View QAM™
Rev. 001 DSAM Field View QAM Guide 7
26 Select Group Delay
27 Back
28 Select Impulse Noise
Figure 13 Group Delay
Figure 14 Impulse Noise
16. DSAM Field View QAM Guide
DSAM Field View QAM™- Example of Detected Problems
8 DSAM Field View QAM Guide Rev. 001
DSAM Field View QAM™- Example of Detected Problems
Figure 15 Bad Packets
Figure 16 Bad Packets (In-Band Response)
Figure 17 Bad In-Band Response
17. DSAM Field View QAM Guide
DSAM Field View QAM™- Example of Detected Problems
Rev. 001 DSAM Field View QAM Guide 9
Figure 18 Bad Group Delay
18. DSAM Field View QAM Guide
DSAM Field View QAM™- Example of Detected Problems
10 DSAM Field View QAM Guide Rev. 001
19.
20. Test and Measurement Regional Sales
North America
Toll Free: 1 800 638 2049
Tel: +1 240 404 2999
Fax:+1 240 404 2195
Latin America
Tel: 954-688-5660
Fax:954-846-8856
Asia Pacific
Tel: +852 2892 0990
Fax:+852 2892 0770
EMEA
Tel: +49 7121 86 2222
Fax:+49 7121 86 1222
www.jdsu.com
DSAM Field View QAM™ December 2012