SAM is powerful diagnostic capability because it allows network administrators to correlate client location, client
state, and network behavior and to “replay” the state transactions. For instance, the network administrator can
view detailed client statistics, the dynamically changing floor-plan heat map, and network statistics for any 24-
hour period over the last six months (see Figure 9).
Figure 9: Meru E(z)RF Network Manager
Motorola
The Motorola LANPlanner is a very sophisticated network-design tool that allows administrators to perform site
surveys and simulate WLAN traffic. Motorola has continued to refine this tool (e.g., adding support for 802.11n)
since its purchase of Wireless Valley in 2005. Like similar tools, administrators usually import a floor plan and
then must tell the tool about wall, floor, and ceiling materials. The tool can recommend AP locations and settings
based on the number of users and their locations. The tool also allows administrators to manually place APs on
the floor plan, and it will provide real-time, 3D predications of RF signal propagation. The tool can import site-
survey information and correspondingly adjust the predictive design.
Once the LANPlanner design is complete, administrators can export the design directly into Motorola's main
WLAN network-management product, called RF Management Suite (RFMS). Previously a stand-alone
component, RFMS is now part of the AirDefense Services Platform (ADSP). The name of the LANPlanner
design (e.g., Burton Group) is used as the site name in RFMS and is imported directly into the RFMS site
navigation. This feature helps network administrators build the network hierarchy in RFMS. Administrators must
manually reconcile the predictive design with the as-built network.
The Motorola solution provides client load balancing, but it does not currently provide band steering. Motorola
believes that the optimum way to leverage the 5 GHz band is through client configuration. Most modern 802.11n
clients already attempt to associate with the 5 GHz band first and thereby reduce bandwidth waste from excessive
probing in the2.4 GHz band. On the other hand, many enterprises continue to use old stations that may not select
the best frequency band for optimal performance. Therefore, the value of band steering is to ensure that all the
802.11n clients show preference to the most appropriate band.
The RFMS provides control over how the network is viewed by offering a site view (i.e., sites, floors, and
devices), a device view (i.e., wireless switch, AP, and clients), and a mesh view (i.e., mesh links between all APs
within a site; see Figure 10).
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