Westell Technologies Versalink 327W User Manual page 77

User Guide
PBCC Algorithm
ERP Protection Algorithm
Rate Adaptation
Rate Fallback
802.11b Rates (Mbps)
802.11g Rates (Mbps)
030-300408 Rev. B
Always ON: Transmissions are done using a usec slot time (SST).
Local STA's: If all associated stations support SST, then the 9 usec slot time is used.
Otherwise, the 20 uses slot time is used.
Enhanced Dynamic: Similar to Local STA's, with the following extension: If
associated stations that do not support SST do not transmit for a period of time, the 9
usec slot time is used.
Factory Default = Enhanced Dynamic
Possible Response:
Always Off: PBCC is not used, operation at 22 Mbps is not possible.
Always ON: PBCC is used.
Local STA's: If all associated stations support PBCC, then PBCC is used.
Otherwise, PBCC is not used.
Dynamic: Similar to local STA's with the following extension: PBCC setting is also
dependent on Beacon frames from overlapping BSS. If Beacon frames are received
that do not support PBCC, then PBCC is not used.
Enhanced Dynamic: Similar to Dynamic with the following extension: If associated
stations that do not support PBCC do not transmit for a period of time, then PBCC is
not used.
Factory Default = Dynamic
Possible Response:
Always Off: ERP is not used
Always ON: ERP is used.
Local STA's: If there are any associated stations than do not support ERP, a
protection algorithm is used to prevent contention.
Dynamic: Similar to local STA's with the following extension: The ERP protection
setting is also dependent on Beacon frames from overlapping BSS. IF Beacon
frames are received that indicate ERP is not supported, then a protection algorithm is
used.
Enhanced Dynamic: Similar to Dynamic with the following extension: If associated
stations that do not support ERP do not transmit for a period of time, then protection
algorithm is not used.
Factory Default = Enable
If disabled, the highest rate shared between VersaLink and STA is used for each
transmission.
Factory Default = After 1 Retry
The number of retries to attempt before falling back to the next lower rate. If
Fallback is disabled, the starting rate is the only rate tried. IF Rate Adaptation is also
disabled, the maximum rate shared with the STA is always the starting rate and the
only rate tried. This may not work in noisy environments, and will reduce roaming
distances.
Possible Response: After 1 Retry/ Disable/ After 1 Retry/ After 2 Retry
These are the allowable communication rates that VersaLink will attempt to use. The
rates are also broadcast within the connection protocol as the rates supported by
VersaLink.
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VersaLink™ Gateway (Model 327W)
August 2005