Management and Diagnostic Console
89
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
.
Impulse Noise
Comp. Tones
Indicates the number of
compensation tones on which
impulse noise is detected. For
non-interleaved lines with
impulse noise, the connect
rate will be lowered to avoid
excessive errors on the line;
however, impulse noise may
vary with time, so connect
rates may vary accordingly.
Impulse Noise Compensation
is currently disabled for
interleaved lines.
The ideal value is
zero (0).
Ok
or
Suspicious -
Impulse noise detected
.
Excessive
Impulse Noise
Indicates to what degree
impulse noise is present on
the line.
The ideal value is
zero (0).
Item
Description
Value
Comment
