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Management and Diagnostic Console
97
Analyzing General Information
The General Information pane shows diagnostic information for the current DSL connection (or connection
attempt). These values are also listed in the last row of the Training History pane.
Item Description Value Comment
DSLAM Lists information about the
DSLAM, including country,
DSLAM vendor, and specifics.
DSL Line During line search, the value
will alternate between 1 and
2. The “Searching for DSL
signal” comment appears until
the ADSL protocol is
confirmed with the DSLAM on
the current line.
1 or 2.
None or Searching for DSL
signal
.
Downstream
Rate Cap
The configured DSL service
downstream speed.
Varies by service
provider.
Downstream
Atten. at 300kHz
The measurement (in kbps) of
the decrease in downstream
signal strength.
Varies by service
provider.
Uncancelled Echo Measure (in dB) of the
uncancelled echo relative to
the background noise on the
line, indicating how much the
uncancelled echo is affecting
DSL performance.
Appropriate values
usually range
between -25dB and
-6dB. A positive
value (for example,
+12) could
indicate the
presence of an
unfiltered
telephony device
and/or an alarm.
Ok or Suspicious - check
phone filters and alarm
.
VCXO Frequency
Offset
Indicates the difference
between the gateway’s and the
DSLAM port’s crystal
frequency in parts per million
(ppm).
The ideal value is
zero (0). The
maximum
difference should
be less than 150
ppm.
Ok or Suspicious -
hardware frequency
mismatch
.
Final Rx Gain Indicates the current receive
gain setting (in dB).
Dependent on DSL
line length.
Ok or Suspicious -
possible saturation
.