WLAN Planning – Get it right the first time
TRADITIONAL THINKING
The goal of the site survey is to determine the optimal placement
of the minimum amount of access points to provide reliable
RF coverage.
Optimal placement is code for “where and how do I install this thing?”
Installation in the hallway
Traditionally, access points are installed in the hallways, and push the
power through firewalls, firedoors, and around mirrors. The site survey
needs to consider these factors and ensure coverage within the
guest room.
Hallway ceilings of a typical hotel are hardcap to meet fire code
regulations. The cost of installation in a hardcap ceiling can average
$400 per AP. Another factor to consider is co-channel interference
between APs with little attenuation between them. During the
site survey, this is usually ignored.
Because of these two factors — high signal attenuation and high installation cost — the physical placement of the access point is a critical
determinant of the wireless WLAN success.
If you make a mistake
A poor site selection for the access point is very difficult to correct. Typical corrective action usually involves a higher gain antenna or
relocating the installation site of the access point.
NEW THINKING
The goal of the site survey focuses on RF planning,
not physical installation
3 The AP 6511 802.11n Wall Plate Access Point
By installing the access point inside the guest room, the physical
placement is always known. Installation density is easy to control and
installation location is easy to change.
When the access point is installed in the room, co-channel
interference is greatly reduced. It’s easy to understand why: the walls
that attenuate the guest signal also prevent one access point from
interfering with another access point on the same channel.
Pre-installation site surveys can now focus on the RF planning and not
the physical installation. This will lead to a more reliable site survey. If
the MDUs are constructed of multiple, repeating rooms, a simple site
survey can easily be replicated and adjusted on the fly.
(56 paginas)
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