Specifications

BPG_11n_v1.0 | Page 22
This distance is important as we do not want the APs so close to each other such that there
would be sideband or adjacent channel interference. Nor do we want them too far apart such
that the coverage patterns for the various channels differ greatly.
With two APs (or more) co-located we now have the ability have two channels in each
spectrum. This allows us to have redundancy in the 2.4GHz band as well as in the 5GHz band.
The image below is an example of how channel layers can be deployed to support high client
density areas such as an auditorium. In this example there are three ESSIDs: auditorium,
campus and voice. LB works within a specific ESS. For LB to work there must be at least two
channels in the same spectrum that have an ESSID in common.
In the example below LB is enabled on just the auditorium ESSID.
Notice that there is a “student” SSID that spans two ESSIDs (campus and auditorium). With
this single SSID available everywhere clients only need to associate to a single SSID. This
way there can roam from areas where there is no LB to areas where LB is enabled without
changing the SSID they are connected to. The above illustration also shows a “voice” SSID
and ESSID that is deployed pervasively.
EzRF Location Manager Deployments
Meru Networks partners with Newbury Networks for the Location Manager (LM) solution.
This solution works on “fingerprinting” rather than simple triangulation. Fingerprinting
considers the unique RF characteristics of each location in the environment when making a
location calculation. This technique provides greater precision than triangulation.
MERU BEST PRACTICES GUIDE | 11n Design, Implementation and Optimization