Tamograph Site Survey Pro Crack.epub
Ashlie Hagenson
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.
Mistakes can be made with the use of survey tools that are able to make a site survey report look good. These mistakes can make an entire floor or building appear to have sufficient coverage when, in reality, client devices in certain areas can have very weak coverage.
Data gathered from a map that is not properly calibrated results in a completely inaccurate survey report. It is recommended to verify the map calibration in survey reports where the heat maps do not look correct.
In most cases, there is a single data point or AP radio provides much larger coverage in the survey map when compared to actual coverage. It is a good practice to view AP heat maps individually and verify the actual size of the coverage.
You cannot recalibrate the map after the survey is performed to repair survey data that was taken when the map calibration was not properly scaled. You must correct the map calibration and perform a new survey.
The default for AirMagnet is 40 feet, which is not precise enough for accurate results. A setting of 15 to 20 feet provides results that are more accurate. As mentioned earlier, it is always a best practice to view AP heat maps individually.
Another recommendation is to only scan or view heat maps for SSIDs that are provided by the wireless infrastructure. This is very important in buildings where an adjacent floor belongs to another party.
The primary objective of a post-validation site survey is to provide detailed information that addresses the current RF coverage and determines whether there is sufficient coverage to support the network design requirements.
Post-validation surveys must also include information that addresses interference sources, equipment placement, and rogue devices. The site survey documentation serves as a guide for the verification of the wireless infrastructure.
It is possible to have a survey report that shows good coverage in all areas; however, if you have APs that operate at the highest transmit power, you possibly continue experience uplink issues where the client devices do not support the same transmit power.
For example, based on the RF guidelines specified in the Cisco 7925G Wireless IP Phone Deployment Guide, you must use non-overlapping channels and allow at least 20 percent overlap with adjacent channels when phones are deployed in the 802.11b/g environment.
SNR is the ratio of a given transmitted signal to the background noise on that channel. The RF guidelines specified in the Cisco 7925G Wireless IP Phone Deployment Guide require a minimum SNR of 25 dB (25 = -92 dBm noise level with -67 dBm signal).
The noise floor is a mixture of all of the background RF radiation found in the environment that surrounds the system in use. RF signals must be higher than the noise floor in order to be detectable as a valid, useful signal by a receiver.
The RF signal can bleed through from upper and lower floors.. It is important to know how much signal bleeds through the floors because this can cause co-channel interference and can also be the reason why an AP radio operates at a very low power level.
View a map with the AP placements on each floor and verify that the AP placements are not stacked directly higher or lower than the same AP placements on a given floor. AP placements across floors must be staggered to provide better coverage.
Rogue APs are wireless APs that have been installed on an enterprise network without the authorization of the enterprise information technology department. Most rogue APs are not installed securely and can be used by outsiders to gain access to an enterprise network.
If there is not a business justification for these APs, they must be disconnected immediately from the network. When disconnected, this improves the overall network security and reduces RF interference with nearby infrastructure APs.
A separate walkthrough is normally completed with the service provider experts in order to detect and record rogue devices and interferers, which gives you a summary of what was detected at that time.
If there are no lost packets, then try to move the client away from the AP in order to determine whether there is any additional range available while enough signal is maintained to have quality application performance.
When you perform coverage tests on 2.4 GHz, it is recommended to have the lower data rates disabled. This is because the -67 dBm RSSI coverage area is much larger at one (1) Mbps data rate than 12 Mbps.
Wireless data rate configurations are one of the most critical tools available to tune and optimize wireless networks. The choice of data rate directly impacts coverage and performance; therefore, it is essential to understand how changes to data rates impact an environment.
If you increase the range, this results in greater coverage at the expense of overall throughput. In 2.4 GHz deployments (and very dense 5 GHz deployments with limited channels), this is likely to negatively impact channel utilization as a result of adjacent co-channel interference.
For example, if you have voice services in the environment, you are likely to have a higher density deployment and must disable the lower data rates to improve performance (guideline for 792x is 12 Mbps as lowest).
If you have a warehouse with old 802.11b scanners, obviously you must keep the lower rates enabled. Version 7.2 of Wireless LAN Controller software enhances our control of the environment through the use of RF profiles, which allows you to set data rates on a per AP group basis.
In general, most deployments set the lowest enabled rate as the mandatory rate. High density and multicast environments have multiple higher mandatory rates. Refer to the Multicast Delivery section in this document for more details.
In general, Multicast/Broadcast frames are sent at the highest mandatory (basic) data rate. There is an exception if there are current associated clients that transmit at a rate lower than the highest mandatory rate.
Change the mandatory rates in order to modify multicast performance. When you set high mandatory rates, this allows higher bandwidth multicast streams to be delivered, although all clients do not receive the stream very reliably.
inSSIDer is a Wi-Fi scan application developed by MetaGeek. It is compatible with Windows XP, Windows Vista, and Windows 7 (32 and 64 bit). It allows you to track received signal strength with the wireless adapter that is already installed.
The various filters that you can apply are located at the top of the screen. In Figure 20, the filter is set on the SSID guestnet. Filter on the SSID that you want to measure to avoid any incorrect results from nearby rogue wireless networks.
In this example, voice services fail in this environment, as there is only one (1) signal strength greater than -67 dBm (with the assumption of a noise floor of -92 dB, which allows for a SNR of 25 dBm).
The connected AP is highlighted in red. With the Auto scan mode enabled (by default), the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G idle (not on call), Auto scan only scans when the current signal lowers to the scan threshold, so only a single AP is visible in the list.
In order to view all APs in the neighbor list menu with Auto scan mode, place a call from the Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G, where the scan operation occurs constantly while the phone call is active in Auto scan mode.
b1e95dc632