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The Site Survey is an assessment of coverage radio access points (APs) within a specific building. He confirmed with coverage for 100% customer guarantees employees receive a signal will have no problems with the transmission of wireless packets over the network have. Each building is a design, the signal characteristics determined. The most common problems that cause problems with radio signals are downWater, metal, side dishes and devices that emit electromagnetic interference. Some access points can send a sample of extended coverage of 100-170 meters, while some will emit a signal 50 feet with the same properties. Structural engineering building has a lot to do.
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What follows is an overview of the site survey process:
1) Discuss rate signal / noise data with the customer
2) Obtain plans
3) building survey and the light signalSignal
4) Document Access Point Placement
So what is an acceptable signal? Signal to noise ratio of about 20 to 25 dBm at 54 Mbps is a minimum for most projects. The software Site Survey, a continuous measurement signal and 95 dBm 75 dBm Noise (75/95) would be sufficient for the staff connected and sending packets with the same level of service as wired clients. Signal weakens as it becomes more difficult to distinguish between a signal of 80 dBm and 95 dBm Noise (80/95). There areless separation between signal and noise makes the signal difficult to detect. And 'illogical that a greater number of keys, but a weaker signal with the signal and noise measurements, the signal is a negative number and then a lower value, more. Discuss with the client, that specific client adapter, 802.11n wireless standard, data rates and will implement this investigation. Provides the 802.11a standard does not require another poll, if youImplementation of dual band and an interview with 802.11g. Some companies with high bandwidth requirements will improve the coverage 802.11a cell with another survey. It is not cheap so used, with additional access points for cellular coverage effectively. Configuring the Access Point 802.11a/b/g protocol selected, the transmit power and data rate. Set the data rate and power up the card to the customer during the investigation.
The study includes a building site around with a handsetdriven a car with a Cisco Aironet wireless client adapter and the Cisco Desktop Utility (ADU) can be configured. The software is a utility that allows Cisco client adapters. The Cisco access point at a certain point on the ceiling or the floor is made, the wall, desktop, or sleeping space and measures radio coverage observed. The access point is moved, until the optimum coverage for that cell. Choose to investigate ADU active mode data rate, link status and errorduring the measurement. The cell can cover a floor plan Visio drawing with specific access rights are transferred to positioning and signal limits. The access point is about until the whole building is allocated moved. The signal strength should be taken for minimal cell coverage. Be as specific as possible to describe where access points should be implemented. Some customers have plans that are easier to study in place a lot, makes the document supply. Scan any floor plan as a Visio drawingDetermine the placement of access points and channel assignments.
Your card will be some overlap of coverage that is not relevant. You should not assign a channel that does not overlap with neighboring cells and employees have no problem with signal interference. As already mentioned, 802.11b and 802.11g use the 2.4 GHz frequency, which can cause interference, however, there are three non-overlapping channels (1, 6 and 11), which can be assigned. As an exampleYour building should have a ground floor with 17 rooms and three bedrooms each access point coverage using the following channel assignment:
AP1 Channel 1 bedroom 1-3
AP2 Channel 6 Room 4-6
AP3 Channel 11 rooms 7-9
AP4 Channel 1 room 10-12
AP5 Channel 6 rooms 13-15
AP6 Channel 11 Rooms 16-17
In some cases, it could signal between AP2 and AP5 invaded with specific forms of planning. Reduce the transmission power of 100 mW to 20 mW of one or twoAccess points and confirm the signal strength is still acceptable in these areas. The reduced transmission power adjustment for the same coverage should not change the position of the AP (Access Point) to help implement an additional access point at reduced power or an external antenna. Inspections to know some trial and errors, occur where signal coverage is possible. I know you are after some preliminary testing of a particular building, what to expect coverage. Walk with the laptop and bootget some understanding of signal patterns. Signal can often passing out of the building represents a security risk for hackers to occur on the road. The inspection should confirm that no signal with minimized overrun AP transmit power.
Multi-storey buildings must submit a number of access points that transmit signals over several floors. You can of course also should include a minimum number of access points, access points, floors or decrease the transmit power and assign non-overlapping channels discussed. The problem withPassing signal is a concern, where an AP has about a plan and not everyone in a room on another floor. They arranged to AP with the proper signal coverage and minimum overlap. In addition, the building can lead to an AP, one floor or two floors, ceilings, with signal strength anywhere, if necessary. If there is a third floor you can use on this floor. The first and second floor would have an access point on the first floor. The distribution of the background signal overlap. Thatis not a problem of non-overlapping channels, but with rapid roaming customers should connect with the nearest access point. Once the access points to the second and third floor could lead some customers to the third floor of the AP that a second floor over the use and reduces the power to choose.
The client sends a beacon and select the next AP with the strongest, fewer customers and appropriate security settings. A negotiation between the AP and client adapters, and data are sent tomaximum supported speed available. The coverage map with the AP placement should be as specific as possible during the survey describes the access point placement. By providing all access points and connectivity test. Occur with all points of access opportunities for transmission problems and the design can be changed before deployment. Overcoming external signal testing confirms the signal remains within its borders and there is no AP wall is from the street. Spectrum analyzers can be on site during the investigation or provided byexamine the frequencies with interference and possible causes. Definition of a security test plan is a good idea after deploying the access points.
Take notes on survey questions mount, where AC power outlets available, the distance between wiring closets and wiring distance between access points and switches. Cisco wireless bridges available outside buildings are interconnected with the line of sight. There is a poll with the provision of these bridges, the path loss includedTransmission signals and transmitted as environmental issues like the wind and rain data.
Copyright 2007 All rights reserved Shaun Hummel
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