Collocation And Interference - Alvarion BU-DS.11 User Manual

BreezeNET DS.11 Series Use Manual
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Collocation and Interference

How many BU-DS.11 or RB-DS.11 units can be collocated on the same
building or tower?
Up to 3 BU-DS.11 or RB-DS.11 units can be collocate on the same structure. Each
unit is assigned to one of three non-overlapping channel (e.g. channels 1, 6, and
11 in FCC compliant installations).
What is the antenna separation requirement for collocating BU-DS.11 or RB-
DS.11 units on the same building or tower?
The antennas should be mounted at least 60 cm (2 feet) apart when using
UNI-16's, 4.5 m (15 feet) apart when using UNI-24's, and 21 m (75 feet) apart when
using OMNI-8's. Greater separation will improve the link distance.
Can a Frequency Hopping network operate in the same area as the
BreezeNET DS.11?
A Spread Spectrum Frequency Hopping network can operate in the same area as
the DS.11 network. However, in a collocated network both products will suffer
some a decrease in performance. The degree of performance loss depends on
network utilization. For example, the higher the utilization of the Frequency
Hopping network, the higher the level of impact on the Direct Sequence (DS.11)
network, and vice versa. Typically, in light to moderately utilized networks, the
performance loss is not significant.
Can I use DS.11 Bridges to feed a Frequency Hopping distribution point?
DS.11 can be used to feed a Frequency Hopping distribution point. Impact on
performance of both systems can be minimized if the network is designed using
cross-polarized directional antennas with as much spatial separation as possible.
Contact technical support for more information.
What if the DS.11 link experiences interference?
If interference is affecting the DS.11 link, one of the other channels may be
selected to operate away from the frequency of the interference. Also, physically re-
locating the antennas may help.