JDS Uniphase OneExpert DSL, User Manual

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Chapter 10 Test Results
DSL Results
OneExpert DSL User’s Guide
April 2014 22052280, Revision 001
83
DSL Identity
Table 14 describes the DSL Identity results.
DSL Graphs
The graphs provide a graphical representation of the following:
• SNR (signal to noise ratio) Per Tone
• Bits Per Tone (BPT)
• QLN (quiet line noise) Per Tone
• Hlog Per Tone
Troubleshooting using the graphs
The SNR graph indicates line quality. The BPT graph indicates the total bit rate and is a useful tool
for finding disturbers. Bits per tone is defined as bits assigned per DMT tone.
Examine the portions of the graphs where there are dips or breaks. These dips represent areas
where interference is degrading the DSL signal.
Table 15 lists common noise sources and the corresponding frequencies and tones.
Table 14 DSL Identity results
Result Description
HW Type Type of modem hardware
HW Rev Revision of the hardware
xTU-R SW Revision SW revision of the local modem
xTU-R PHY Revision PHY firmware revision for the local modem
xTU-O Vendor CO vendor code
xTU-O Rev CO revision number
Table 15 Noise sources and tones
Noise Source Noise Frequency (kHz) Tone # Tone Frequency (kHz)
ISDN BRI 40 9 38.8125
HDSL passband center 196 45 194.0625
HDSL passband max 392 91 392.4375
HDSL2 274 64 276
T1 passband center 772 179 772
E1 passband center 1024 237 1022