Exalt Communications, Inc.
r-series
Installation and Management Manual
5000007 (ETSI)
62
2007-02-12 (draft)
can and will vary as a result of weather changes and other external sources, such as path
obstructions. Once again, this variation was part of the original design to achieve a certain
level of performance over time. Bit errors occur when the RSL falls to a level within roughly
3dB of the threshold specification. When the RSL falls below the threshold specification, the
link disconnects and will not reconnect until the RSL is above the threshold specification.
The behavior of RSL in relation to other alarms or measurements and external events can be
very helpful in troubleshooting activities.
•
Errored Seconds (ES) indicates the total number of seconds that occurred where there was at
least one bit error since the last time that the radio statistics counter was reset. Generally, ES
are not a significant concern, so long as they are not continuous or above the anticipated
performance based on the original link engineering goals. If ES are continuous or at a high
rate, this is normally an indication of poor link performance due to poor RSL or interference,
or severe impact by weather or other environmental factors. However, similar to the
performance factors previously listed, ES can and will occur in any radio link. Once again,
consult the link engineer to determine the original design goals, and compare actual
performance to these expectations to determine if any improvements are necessary or if other
problems may be causing excessive ES.
Unavailable Seconds do not register as ES. In other words, the ES counter counts
all seconds that are errored NOT INCLUDING the seconds that were classified as
unavailable. The total number of seconds with errors or outages is the sum of ES
and Unavailable Seconds.
•
Unavailable Seconds (also called UAS) are similar to ES, but this counter keeps track of
every second where the bit error rate equals or exceeds 1x10
-3
, as well as any seconds where
there is a complete loss of radio communication, over the period since the last counter reset.
If Unavailable Seconds are continuous or at a high rate, this is normally an indication of poor
link performance due to poor RSL or interference, or severe impact by weather or other
environmental factors. However, similar to the performance factors listed above, Unavailable
Seconds can and do occur in any radio link. Consult the link engineer to determine the
original design goals, and compare actual performance to these expectations to determine if
any improvements are necessary or if other problems may be causing excessive Unavailable
Seconds.
•
Minimum RSL indicates the worst (lowest) received signal level that occurred since the last
counter reset. It is helpful to know if the RSL dropped significantly from the normal level, or
has reached a level near or below threshold.
•
Minimum RSL Timestamp indicates the date and time when the Minimum RSL occurred.
This is helpful for general troubleshooting, and especially comparing to items in the event
log or diagnostic charts from the same time period.
•
Maximum RSL indicates the best (highest) RSL that occurred since the last counter reset.
This indicates the best performance of the radio link, which is normally equal to the installed
value, and is usually the designed value.