After the the AutoCAD drawing was inserted into LanPlanner software, LanPlanner will format the building. Formatting the building is a crucial part in the site survey process. In order to accurately predict and measure the RF infrastructure the format process must be accurate. The format process consist of telling LanPlanner from the original drawing what type of obstruction is in the building and what the obstruction is made of and the height of the obstruction.
After the format process, Access points can be placed. The hospital building already had existing internal antenna AP300’s. Each AP300 was placed roughly 9′ from the ceiling. Each AP300 color represents a channel. For the least amount of channel interference for 802.11b/g, channels 1, 6, & 11 are to be used. Black represents channel 1, Red for channel 11 and Yellow represents channel 6. This LanPlanner application was to adjust the channels for less channel interference. Each AP was on channel 1 and LanPlanner ran its channel prediction to assign each AP a channel 1,6, or 11 for non-overlapping and less channel interference for 802.11 b/g 2.4Ghz band.
Floors 3 & 4 channel assignments and formated drawing.
With the AP’s placed then LanPlanner can predict the RSSI(Received Signal Strength Indication), SNR (Signal to Noise Ratio), Channels, and the throughput. For this hospital facility. It was stated that each AP power was set to 17dBm. LanPlanner provide a prediction heat map of the AP power settings. In the colored heat map drawing of the warehouse, each color represents a different amount of RSSI or throughput. RED is a -50dBm(dBm is the power ratio in decibels) or can represent any where from 48Mbs to 54Mbs of throughput. YELLOW is a -60dBm or can also represent anywhere from 36Mbs to 48Mbs of throughput. GREEN is a -70dBm or also represented anywhere from 24Mbs to 36Mbs of throughput.
Floors 3 & 4 predictions
For this LanPlanner application we ran measurements on already existing AP’s to see if we could adjust the power and or channels to optimize the RF coverage. LanPlanner software uses a Motorola tested and certified wireless card to take measurements. In the facility the LanPlanner engineer walks around the facility and takes measurements from any given point. LanPlanner records the RSSI, SNR, and or Data rate in real time from the surrounding approved Access Points. The RED dot represents a point at which a measurement had taken place. LanPlanner takes the measurements and produces a heat map. The RED color represents -50dBm or 48-54Mbs of throughput as stated in the prediction process, the YELLOW represents -60dBm 36 – 48Mbs of throughput, and GREEN is -70dBm or 24-36Mbs of throughput. The WHITE space in the drawing is indicating where a measurement was not taken. This could be caused by pallets in the way or product on the floor to where a measurement could not be taken.
Floors 3 & 4 Measurments