Radio Card Frequency and Type Default Channel Second Default Third Default
4.8 GHz 802.11a 164 184 174
4.9 GHz 802.11a 20
5 GHz 802.11a 153 161
5 GHz 802.11ac FCC:157, CE:136 FCC:48, CE:100
5 GHz 802.11n (ME4, LX5) FCC:157, CE:136 FCC:149, CE:100
5 GHz 802.11n (ES1) FCC:157, CE:136 FCC:48, CE:100
Dual band 2.4/5 GHz 802.11n 11 (2.4 GHz)
Note
Note
BreadCrumb models DX2, ES1, Peregrine and Hawk do not support 802.11a or 802.11g radios.
BreadCrumb models DX2, ES1, Peregrine and Hawk do not support 802.11a or 802.11g radios.
In some cases, it may be necessary to manually set the radios to specific channels to provide critical links
within a mesh. This can be especially important when using single-radio BreadCrumb devices. Refer to
the BC|Commander Version 11 User Guide for the details about BreadCrumb channel configuration.
4.3 Physical Placement and other Considerations
Commonly occurring environmental factors have a significant impact on performance and behavior of
the BreadCrumb Wireless Network. Line-of-sight (LOS) obstructions, distance, weather and device place-
ment should all be considered when deploying a wireless network.
IEEE 802.11 wireless operation degrades gradually as distance increases between nodes or as interfer-
ence becomes prominent. This manifests as a data rate reduction between nodes.
The goal in planning and deploying a BreadCrumb mesh network is to maximize both coverage and the
data transfer rate between devices by taking into consideration all of the contributing factors described in
this section.
4.3.1 Line-of-Sight
Unobstructed line-of-sight (LOS) between BreadCrumbs and wireless clients is critical for optimal perfor-
mance of the mesh. Partial LOS obstruction results in noticeable network performance degradation. Total
LOS obstruction can result in complete loss of network connectivity.
Elevating the device and external antenna will assist in providing better LOS to enable radio waves to
propagate over some possible obstructions.
Each BreadCrumb device must have unobstructed LOS to the previous and subsequent BreadCrumb
device.
Client connectivity will degrade and drop if LOS to a BreadCrumb device cannot be maintained.
Unobstructed LOS is not necessary from every BreadCrumb device and wireless client to every other
BreadCrumb device and wireless client.
Fresnel Radius
In BC|Commander version 11.9 or later, on the Peers tab, the radius value in the Fresnel Radius column
can help determine where antennas must be placed for the wireless signal to sufficiently clear any obsta-
cles between two BreadCrumbs. Obstacles include buildings, trees, vehicles and the ground.
In the following figure, “r” represents the radius of the first Fresnel Zone at a point halfway between two
peer BreadCrumbs.
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