Access5830™ User Manual
6
When power is first applied to a properly installed SU, it will scan all the channels in its scantable,
searching for an AP that is sending transmit grants for this particular SU. The SU will then stop
on that channel and respond to the AP using maximum RF power. Before the AP can add the SU
to the polling list, it must authenticate the SU by verifying the MAC address, and performing a
ranging operation to the SU. This process involves sending a special command to the SU and
getting an instantaneous reply from the SU.
Upon successfully locating and ranging the SU, The AP will then add the SU to the normal polling
list and level the RF transmit power level from the SU to set a good signal-to-noise ratio at the AP.
The AP uses several parameters to determine how often each SU is polled for data, and the
conditions of any data transfer, as follows:
1) Committed Information Rate (CIR)
2) Maximum Information Rate (MIR)
3) Priority
4) Poll response timeout
All the above parameters are set in the AP by the system administrator and cannot be controlled at
the SU. It should also be noted that the MAC table located in the AP is dynamic and stores up to
2000 entries. There is no limitation on the number of IP addresses or hardware devices that an
individual SU may have physically connected to it.
