Chapter 4 Status Screens
P-870HN-51b User’s Guide
69
Actual INP
Sudden spikes in the line’s level of external noise (impulse noise) can
cause errors and result in lost packets. This could especially impact the
quality of multimedia traffic such as voice or video. Impulse noise
protection (INP) provides a buffer to allow for correction of errors caused
by error correction to deal with this. The number of DMT (Discrete Multi-
Tone) symbols shows the level of impulse noise protection for the
upstream and downstream traffic. A higher symbol value provides higher
error correction capability, but it causes overhead and higher delay which
may increase error rates in received multimedia data.
Total
Attenuation
This is the upstream and downstream line attenuation, measured in
decibels (dB). This attenuation is the difference between the power
transmitted at the near-end and the power received at the far-end.
Attenuation is affected by the channel characteristics (wire gauge,
quality, condition and length of the physical line).
Attainable Net
Data Rate
These are the highest theoretically possible transfer rates at which the
port could send and receive payload data without transport layer
protocol headers and traffic.
xDSL Counters
Downstream
These are the statistics for the traffic direction coming into the port from
the service provider.
Upstream
These are the statistics for the traffic direction going out from the port to
the service provider.
FEC
This is the number of Far End Corrected blocks.
CRC
This is the number of Cyclic Redundancy Checks.
ES
This is the number of Errored Seconds meaning the number of seconds containing
at least one errored block or at least one defect.
SES
This is the number of Severely Errored Seconds meaning the number of seconds
containing 30% or more errored blocks or at least one defect. This is a subset of
ES.
UAS
This is the number of UnAvailable Seconds.
LOS
This is the number of Loss Of Signal seconds.
LOF
This is the number of Loss Of Frame seconds.
LOM
This is the number of Loss of Margin seconds.
Refresh
Interval
Enter the time interval for refreshing statistics in this field.
Set Interval
Click this button to apply the new poll interval you entered in the
Refresh Interval
field.
Stop
Click
Stop
to stop refreshing statistics.
Table 8
Status > xDSL Statistics (continued)
LABEL
DESCRIPTION
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