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OneCheck Overrange/ Excessive Ingress – Noise Not Visible below 42/65/85 MHz
100 –
✓
If the excessive noise causing the
view is set for either 42MHz, 65MHz, or 85MHz change the
frequency span to 110MHz so you can see the whole ONX
upstream measurement span
✓
The frequency span can be changed by pressing the Configure
button, available
from the test location selection screen
(Tap, Ground Block, CPE selection screen)
✓
Signals at these higher frequencies, if present, have the potential
to impact other services operating at those frequencies
NOTE:
Using a Low Pass Filter, one which allows frequencies lower
than 42/65MHz but blocks signals up to at least 110MHz, could be
used to avoid a failure caused by these signals, and which are
frequently present at high levels causing an Overrange during
OneCheck testing (often data or cable modem service only filters
have worked)
✓
When the noise has been mitigated and validated, return to the
OneCheck test and retest
See
Low pass Filter for ingress and ingress expert Measurement
Overrange
is not seen and the
viavisolutions.com
Ingress Scan at a 42MHz span appears to show as passing despite an
Overrange in OneCheck. Expanding the visible frequency span shows a
very high noise spike about 70MHz
© 2020 VIAVI Solutions Inc.
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