ZyXEL Communications P-870HN-5xb User Manual page 69

Table 8 Status > xDSL Statistics (continued)
LABEL
Actual INP
Total
Attenuation
Attainable Net
Data Rate
xDSL Counters
Downstream
Upstream
FEC
CRC
ES
SES
UAS
LOS
LOF
LOM
Refresh
Interval
Set Interval
Stop
P-870HN-5xb User's Guide
DESCRIPTION
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.
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).
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.
These are the statistics for the traffic direction coming into the port from
the service provider.
These are the statistics for the traffic direction going out from the port to
the service provider.
This is the number of Far End Corrected blocks.
This is the number of Cyclic Redundancy Checks.
This is the number of Errored Seconds meaning the number of seconds containing
at least one errored block or at least one defect.
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.
This is the number of UnAvailable Seconds.
This is the number of Loss Of Signal seconds.
This is the number of Loss Of Frame seconds.
This is the number of Loss of Margin seconds.
Enter the time interval for refreshing statistics in this field.
Click this button to apply the new poll interval you entered in the
Refresh Interval field.
Click Stop to stop refreshing statistics.
Chapter 4 Status Screens
69