Guidelines for Overlaying a Cisco Context-Aware Mobility Solution

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The Cisco Context-Aware Mobility Solution (CMX) is designed to provide location-based services and analytics to the users of a wireless network. Overlaying a Cisco CMX solution on top of an existing wireless network requires careful planning and design. Here are three general guidelines to follow:

1. The maximum effective AP spacing should be between 40 feet and 70 feet.

This means that access points (APs) should be placed at a distance of no more than 40-70 feet from each other to ensure good coverage and signal strength throughout the coverage area. If the APs are too far apart, clients may experience weak or no signal in some areas, leading to a poor user experience. On the other hand, if the APs are too close together, there may be interference and congestion, which can degrade the overall network performance.

2. There should be a minimum of two APs within range of each client.

To ensure that clients can always connect to the network and receive good signal strength, it's recommended to have at least two APs within range of each client device. This provides redundancy and improves network availability in case one of the APs fails or becomes overloaded. However, having too many APs within range can cause interference and congestion, so a balance must be struck.

3. APs at the perimeter of the coverage area need to be deployed.

To ensure accurate location tracking and analytics, it's important to have APs deployed at the perimeter of the coverage area. This allows the system to triangulate the location of clients more precisely and provide more accurate data. However, it's also important to ensure that the APs are not too far apart, as this can lead to blind spots and inaccurate location data.

The other two options, D and E, are not correct. The physical placement of APs does not need to be collinear, meaning they don't need to be in a straight line. Instead, they should be placed strategically to provide optimal coverage and avoid interference. Equilateral triangle placement of APs may yield better accuracy, but it's not a general guideline to follow as it may not be suitable for all environments. The placement of APs should be based on the specific needs and characteristics of the coverage area.