Fortress Technologies BreadCrumb Wireless Network Manuel d'utilisateur télécharger pdf (Page 25)

Chapter 4. Deployment Considerations

Weather

Precipitation and fog also act as obstructions blocking the propagation of the wireless network’s radio

waves.

Light fog or precipitation may result in a noticeable degradation of wireless network performance. Heavy

precipitation or fog may result in severe performance degradation and possible loss of network

connectivity.

If the performance of a well-functioning network is degraded by worsening weather conditions, it may

be advisable to add BreadCrumb devices into the network to act as short-haul repeaters to counteract the

effects of the weather. An alternative is to move the devices closer together, reducing the coverage area.

Interference

RF interference can degrade network performance and can come from many different sources, including:

• Other BreadCrumb devices placed too closely together

• Other RF devices such as microwave devices, cordless phone base stations, radio transmitters, other

wireless networks, jamming devices, etc.

• Reﬂections from metal surfaces such as fences and buildings, causing multipath interference

Important: Plan the BCWN to minimize the effects of RF interference!

Altitude

The placement of a BreadCrumb devices has a major impact on its effective range, and therefore network

performance. The components must be elevated above the surrounding terrain to allow for adequate

wave propagation. A device placed directly on the ground has a signiﬁcantly reduced effective range.

Elevating a device above the ground dramatically increases the effective range. Rajant recommends

elevating the components of a BCWN a minimum of two meters (six feet) above the surrounding surface.

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Fortress Technologies BreadCrumb Wireless Network Manuel d'utilisateur Page 25