Everything posted by laireV
Band steering is intended to encourage dual-band client devices, like most modern smartphones, tablets, laptops, and PCs, to use the less-congested and higher capacity 5 GHz band. In order to function properly, band steering assumes that coverage on both the 2.4 GHz bands and 5 GHz bands are at least roughly equivalent in all desired coverage areas. Band steering will prove to be problematic if coverage on 5 GHz is significantly weaker and has coverage holes, as compared to coverage for 2.4 GHz. We often see cases where the Access Points are placed for optimal 2.4 GHz coverage, which can lead to coverage holes on the 5 GHz because (due to physics) 5 GHz has weaker penetration through walls and furniture. Proper 5 GHz coverage designs usually require comparatively more access points and a 6 dB power offset between power at 5 GHz vs. power at 2.4 GHz. We typically use 14 dBm for the 2.4 GHz transmit power and 20 dBm for the 5 GHz transmit power, so as to roughly equalize the coverage area on each band. Coverage equivalence will highly depend, however, on the building structure, layout, and materials. BEST PRACTICE: If there are options for band steering available, then the best option to select is “Prefer 5 GHz” with a threshold of “-80” dBm. This will make the client devices connect normally on the 5 GHz band, but will allow them to connect on 2.4 GHz in areas where 5 GHz coverage is weak but 2.4 GHz coverage is still available.
Wireless design examples.