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 uncan-
celled 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 exam-
ple, +12) could
indicate the pres-
ence of an unfil-
tered 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 fre-
quency in parts per million
(ppm).
The ideal value is
zero (0). The maxi-
mum difference
should be less
than 150 ppm.
Ok or Suspicious - hard-
ware frequency mismatch
.
Final Rx Gain Indicates the current receive
gain setting (in dB).
Dependent on DSL
line length.
Ok or Suspicious - possi-
ble saturation
.
Impulse Noise
Comp. Tones
Indicates the number of com-
pensation 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 inter-
leaved 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
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