Alvarion BreezeACCESS II System Manual page 184

2-48
symmetrical and that this value is a good indication to the level at
which the SU is received by the AU. If the measured RSSI is less
than a certain threshold, it is recommended to decrease the
Maximum Data Rate of the SU in accordance with Table 2-5
(including a 3 dB safety margin). For best results it is recommended
to acquire the RSSI results from the AU, indicating the level at
which the AU receives transmissions from the specific SU (uplink
RSSI), and to use this value for reaching a decision on the
recommended Maximum Data Rate.
Allowed values are 1, 2, 3 Mbps.
The default value is 3 Mbps.
Table 2-5: Recommended Maximum Data Rate
Maximum Data Rate
BreezeACCESS 5.7 GHz RSSI>-70 dBm
BreezeACCESS 5.2 GHz RSSI>-73 dBm
SU-I/I-D
SU-R
AU Transmission Rate Control (SU only) – Enables the user to
define whether the value of the Maximum Data Rate parameter
influences the maximum rate of transmissions from the AU to this
particular SU. In symmetrical links where it was determined that
the Maximum Data Rate of the SU must be set to a value lower than
3 Mbps, it is recommended to also limit the maximum rate of
transmissions from the AU by enabling this parameter.
The default is Disable.
Acknowledge Delay Limit – Enables the user to increase the range
of the system through increasing the time that the unit can wait for
a response message. This includes several scenarios where the unit
expects a response message, such as handshaking during
association process, an acknowledgement after transmitting a data
frame and CTS after RTS. Increasing the range, however, may
decrease the overall performance and achievable network
throughput. It should be increased only to support ranges of over 10
km. If the range was increased for one SU, it must be increased to
the same value for the AU.
Valid values are: Low (up to 10 km), Medium (up to 20 km) and High
(more than 20 km).
The default setting is Low (up to 10 km).
Maximum Number of Associations – Defines the upper limit for
the number of Subscriber Units that can be associated with the AU,
in order to guarantee the required quality of service to the
customers.
Valid values: 0-512.
Manual Revision: 3.0
BreezeACCESS Version 4.3 Operations and Administration
3Mbps
-78 dBm<RSSI<-70 dBm
-81 dBm<RSSI<-73 dBm
RSSI>-64dBm -71dBm<RSSI<-64dBm
RSSI>-65dBm -74dBm<RSSI<-65dBm
2Mbps
RSSI<-78 dBm
RSSI<-81 dBm
RSSI<-71dBm
RSSI<-74dBm
1Mbps