User's Manual

Menus and Parameters
2-59
BreezeACCESS 4.0 System Manual
The default for all subnet masks is 255.255.255.255.
" Set User Filter Range – Defines a range of addresses for
each of the User Filter IP Address entries (the range includes
the base address).
Valid values: 0 – 255.
The default value is 0 (not used).
" Delete a User Filtering Entry – Displays the current list of
IP addresses, subnet masks and ranges. Enter the list
number (from 0 to 7) to delete the entry from the list (the list
number will be replaced by the default values).
" Delete All User Filtering Entries – Deletes all User Filtering
entries (and replaces them with the default values).
" Show All User Filtering Parameters – Displays the current
User Filtering Option and the list of User Filtering addresses,
subnet masks and ranges.
! MIR and CIR Parameters – The CIR (Committed Information Rate)
value specifies the minimum data rate guaranteed to the applicable
subscriber. The MIR (Maximum Information Rate) value specifies
the maximum data rate available for burst transmissions, provided
such bandwidth is available.
Under normal conditions, the actual Information Rate (IR) will be
between the applicable CIR and MIR values: IR=CIR+K(MIR-CIR),
where K is between 0 to 1 and is determined dynamically by the AU
according to overall demand in the cell and the prevailing conditions
that may influence the performance of the wireless link. In some
situations the minimum rate (CIR) cannot be provided. This may
occur as a result of high demand and poor wireless link conditions
and/or high demand in cells with over subscription (total CIR higher
than 1600Kbps). When this happens, actual information rate will be
lower than CIR. The simple solution for managing information rate
in such cases results in an unfair allocation of resources, as
subscribers with higher CIR can actually get an IR lower than that
given to subscribers with lower CIR. A special algorithm for graceful
degradation has been incorporated into the AU, ensuring that the
degradation of performance for each individual subscriber will be
proportional to its CIR.
The MIR/CIR algorithm uses buffers to control the flow of data. To
average the performance over time, a special Burst Duration
algorithm is employed to enable higher transmission rates after a
NOTES:
You may use either Mask or Range (but not both) to define a group of user filter
addresses.
If IP broadcast packets should reach the devices connected behind the SU unit,
the Broadcast IP address should be included in the configured User Filter
Address entries.