User's Manual

Exalt Installation and Management Guide
ExtendAir G2 24GHz Digital Microwave Radios
209866-002 55
2015-09-09
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 (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.
• Current RSL is the measurement of the received signal level at the radio antenna port. This is the
measured level of the RF signal coming from the opposite end of the radio link. The link was
engineered to a specific RSL by the link design engineer, and this RSL should be obtained during
installation and remain relatively stable during the operation of the link. RSL 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.
• 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.
• 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.
• 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.
• (ATPC and/or Receiver Overload Protection enabled) Far-End Transmit Power and Max Far End
Tx Timestamp provide an instant record to assist interpretation of the current RSL as it relates to
ATPC and/or Receive Overload Protection actively changing the far-end transmit power. The
timestamp is recorded for the last instance that maximum far-end transmit power initiated.
• Time Since Reset indicates the amount of time passed since the last counter reset. This helps to
quantify the seriousness of other statistics, such as ES and Unavailable Seconds, if there have been
high numbers of ES and/or Unavailable Seconds over a relatively short period of time.
All end-of-link statistics can be independently reset using the respective reset statistics button. It is
good practice to reset the statistics during link commissioning (after all antenna alignment is complete
and stable RSL at des
igned levels is achieved, a
nd no more system reboots are anticipated). Regularly
review this page to record performance and reset the statistics so that the counters can more precisely
pinpoint issues.
Note: 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.