MD4458-AAII mesh nodes have two access points which means
it provides twice
the AP radio power. Two 180-degree sector
antennas may be used on each of the AP radios to cover
a larger radius than a single omni-directional
antenna. Sometimes the
clients can be distributed in separate directions from
the mesh node; the use of sectored or directional
antennas on the MD4458-AAII can cover such
distributions - with each AP radio being on a
different 802.11b/g channel.
MD4458_AAII is used in underground coal mining
tunnels. Tthe inclined tunnel shaft
requires two service radios each connected to 180 degree
inclined panel antennas facing opposite directions of
the mine shaft.
MD4458_AIII as an Edge Node with 3 AP radios. If the
mesh node does not have any child nodes, then its downlink radio goes
unused. This occurs with isolated nodes or with nodes positioned at the edge
of a mesh. For edge nodes with high client density, a third AP radio
replaces the (unused) downlink radio provides three dedicated Access Point
radios. See green boxes, above..