Westell Technologies Versalink 327W - Manual (Page 68)

030-300500 Rev. A 68 October 2006
User Guide VersaLink™ Gateway (Model 327W)
preamble algorithm is used. Otherwise, the long preamble algorithm is used.
Slot Time Algorithm Factory Default = Local STA’s
Possible Response:
Always Off: Transmissions are done using a 20 usec slot time.
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.
PBCC Algorithm 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.
ERP Protection Algorithm 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.
Rate Adaptation Factory Default = Enable
If disabled, the highest rate shared between VersaLink and STA is used for each
transmission.
Rate Fallback 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
802.11b Rates (Mbps)
802.11g Rates (Mbps) 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.