BreezeACCESS VL Ver. 6.6 GA Release Notes Page 6 of 6
o Small packets maximum throughput starting with Release 6.0 is asymmetric: around
44000pps downlink and 33000pps uplink.
Limitations Specific Only to BreezeACCESS VL 900
• Calculated distance in 5MHz channels might not be accurate when very long ESSID strings are
used. The presented distance may be higher than the real one. It is preferred to keep the ESSID
short (up to 10 characters).
• In VL900, attempting to set the Noise Immunity State Control to Automatic using AlvariCRAFT will
return an Agent Exception error.
• The BreezeACCESS VL 900 system is designed to operate in clear line-of-sight link conditions.
However, operation in near-line-of-sight or non-line-of-sight conditions can be achieved at shorter
distances and certain favorable path propagation conditions; given link performance degradation
is accepted. Signal quality at longer distances and/or through severe obstructions can be
seriously degraded, up to the point where a link cannot be established.
• When running Clear Channel Selection on VL-900 AU units with values other than Default, the
result may be picking a channel with very low noise floor or one with very high noise floor
depending on the parameters configured.
• While Interference Mitigation is active, the Spectrum Analysis results table in AlvariCRAFT starts
displaying irrelevant values. This behavior ends once the Interference Mitigation process is over,
after which Spectrum Analysis in AlvariCRAFT resumes display of the values stored in the results
table prior to running Interference Mitigation. This behavior is only present in AlvariCRAFT and it
does not occur when accessing via Telnet.
• For channels where no suitable solution was found because of high noise levels, the displayed
values for NF, Distance and Performance will be 0.
• During Interference Mitigation, if more than 100.000 events are picked up on one channel, the
scanning process will automatically move to the next channel in the Frequency Subset list,
regardless of the duration configured in Channel Scan Period option.
• If the unit finds over 100.000 events on most or all channels, the outcome might be unreliable,
because it does not perform a fair comparison between different channels. This means that the
entire spectrum is heavily interfered. In this case, it is recommended to decrease the Channel
Scan Period and re-run Interference Mitigation.
• When using AlvariCRAFT, the Interference Mitigation menu is only available on the AU. The
reason is that, on the SU side, it should only be used in special cases, like, for example, when the
downlink SNR is good but the performance is low only for a particular SU in the sector.
• Combining Best AU and Automatic Noise Floor Selection should be done cautiously since Best
AU selected (max RSSI) may not be in the SNR range as implied by the Automatic CCS/NFS
Noise Floor level.
• With respect to “cold start” – When starting the VL system in extremely low temperature ranges
(close to -40°C), the units might achieve maximum performance after a period of time of about 5
minutes. In rare cases, some VL units might require a restart for the radio to operate, 5 minutes
after starting up in extremely cold weather.
• Detailed review of the VL 900 Installation Application Note is mandatory in order to perform a
correct and efficient unit installation.
(10 pages)
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