Specifications

Configuration MP.11 5054-R/2454-R Installation and Management
Interface Parameters
75
For countries in which DFS is not enabled, the Frequency Channel list displays only the channels and frequencies
allowed for the selected country.
• Multicast Rate: The rate at which data is to be transferred. This drop down box is unavailable when DDRS is
enabled.
The default multicast rate for the unit is 36 Mbps. The SU must never be set to a lower data rate than the BSU
because timeouts will occur at the BSU and communication will fail.
Selections for multicast rate for 5, 10, and 20 MHz channel bandwidths are shown in the following table:
• Antenna Gain (BSU only): You can modify the sensitivity of the radio card when detecting radar signals in
accordance with ETSI and FCC Dynamic Frequency Selection (DFS) requirements. Given the radar detection
threshold is fixed by ETSI and the FCC and that a variety of antennas with different gains may be attached to the unit,
you must adjust this threshold to account for higher than expected antenna gains and avoid false radar detection
events. This can result in the units constantly changing frequency channels.
You can configure the threshold for radar detection at the radio card to compensate for increased external antenna
gains.
The Antenna Gain value ranges from 0 to 35. The default value is 0.
• Satellite Density: The Satellite Density setting is a valuable feature for achieving maximum bandwidth in a wireless
network. It influences the receive sensitivity of the radio interface and improves operation in environments with a high
noise level. Reducing the sensitivity of the unit enables unwanted “noise” to be filtered out (it disappears under the
threshold).
You can configure the Satellite Density to be Large, Medium, Small, Mini, or Micro. The default value for this
setting is Large. The smaller settings are appropriate for high noise environments; a setting of Large would be for a
low noise environment.
A long distance link may have difficulty maintaining a connection with a small density setting because the wanted
signal can disappear under the threshold. Consider both noise level and distance between the peers in a link when
configuring this setting. The threshold should be chosen higher than the noise level, but sufficiently below the signal
level. A safe value is 10 dB below the present signal strength.
If the Signal-to-Noise Ratio (SNR) is not sufficient, you may need to set a lower data rate or use antennas with higher
gain to increase the margin between wanted and unwanted signals. In a point-to-multipoint configuration, the BSU
should have a density setting suitable for all of its registered SUs, especially the ones with the lowest signal levels
(longest links).
Take care when configuring a remote interface; check the available signal level first, using Remote Link Test.
WARNING: When the remote interface accidentally is set at too small a value and communication is lost, it
cannot be reconfigured remotely and a local action is required to bring the communication back.
Therefore, the best place to experiment with the level is at the unit that can be managed without
going through the link; if the link is lost, the setting can be adjusted to the correct level to bring
the link back.
To set the Satellite Density, click the Configure button, then the Interfaces tab and the Wireless sub-tab. Make
your density selection from the drop-down menu. This setting requires a reboot of the unit.
5 MHz 10 MHz 20 MHz
1.5 3 6
2.25 4.5 9
36 12
4.5 9 18
612 24
918 36
12 24 48
13.5 27 54