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Q. Do I need a compatible Wi-Fi card to perform active surveys?
A. No, you can use pretty much any modern Wi-Fi adapter. However, active surveys give you only a small part of the WLAN picture. To get comprehensive information, passive surveys are mandatory. A compatible adapter is required for passive surveys.
Q. My card is not on your list of supported hardware. What are my options?
A. Our hardware compatibility list includes only those cards that we've tested ourselves in our test lab. There are other cards that may be compatible with TamoGraph. The best way to find out if your card is compatible is downloading our Adapter Test Utility and running it on your computer. If a compatible adapter is installed, the utility will display its name. Please note that:
| § | Some adapters are compatible only when using Windows Vista or Windows 7. An adapter may not be compatible if you test it under Windows XP, but the same adapter may be compatible if you test it under Windows Vista or 7. |
| § | Before running our test utility, make sure that you use the latest driver supplied by your computer or adapter vendor. Visit their Web site to download and install the latest driver version. This is important, because the results of the test depend on the driver that is used. The newer the driver, the better the chances that it will work with TamoGraph. |
Finally, you may want to buy a compatible card, as they are not terribly expensive these days. Or simply order a boxed version from us; it comes with a compatible 802.11 abgn USB adapter.
Q. Why is the left panel that is supposed to display the list of access points empty?
A. This might be the case for a number of reasons:
| § | You do not have a compatible adapter for passive surveys. The access point list is populated only if you have a compatible adapter or if you opened a project that already contains previously collected survey data. |
| § | You did not install the driver for your compatible adapter. Please refer to the Driver Installation chapter for instructions. To verify that your compatible adapter is present and functioning correctly, look at the lower left corner of the application window. Your compatible adapter name should be displayed there. If the adapter name is displayed, but the list is still empty, contact our technical support. |
Q. Can TamoGraph correctly detect and display 802.11n access points if I perform a passive site survey using an 802.11g adapter?
A. Yes, it can. The same applies to detecting 802.11an access points if you use an 802.11a adapter.
Q. Can I use multiple adapters with TamoGraph to make the scanning process faster?
A. Yes, TamoGraph can capture data from multiple channels simultaneously if you use multiple compatible USB adapters. This shortens the time needed to collect data from the channels being scanned as you move along the survey path, and, therefore, improves the data quality. For example, with the default 250 ms per channel interval, it takes five seconds to sweep through 20 channels if you use only one adapter. If you use three adapters, the same amount of data will be collected in less than two seconds. The following USB adapters can be used for multi-channel capturing: D-Link DWA-160 v.A1 and v.A2, NETGEAR WN111 v2, NETGEAR WNDA3100 v1, Proxim ORiNOCO 8494, SMC Networks SMCWUSB-N2, TP-Link TL-WN821N v1 and v2, TP-Link TL-WN822N, Ubiquiti SR71-USB, and CACE Technologies AirPcap Ex or NX. Note that different types of adapters cannot be mixed; all of the adapters should be of the same model. You should also install the same driver for all of the adapters.
Q. Some of the channels in the scanner options window are grayed out. Is this normal? What if I want to monitor these channels?
A. The answer depends on the adapter type:
| § | Atheros-based CardBus, PCI, miniPCI, miniPCIe, and ExpressCard adapters: Depending on your country, your wireless adapter may not support all the channels shown in that window. The channels that are available for use in a particular country differ according to the regulations of that country. In the United States, for example, FCC regulations only allow channels 1 to 11 to be used in the 802.11b/g/n band. The firmware of the wireless adapters being sold in the US is typically configured to disallow channels 12 and 13. |
| § | Atheros-based USB adapters: All channels are always available when using them in TamoGraph. |
| § | Non-Atheros adapters (e.g. Intel, Dell, or Broadcom): enabling channels 12 and 13 may be possible through some configuration changes. Contact us if you need assistance. |
Q. Why is the UDP downstream throughput value always zero?
A. This is a firewall issue. This means that the UDP data being sent from the server cannot reach the client. When performing UDP testing, the client sends upstream UDP traffic to the server from a random UDP port to the server port (27100 by default.) The return downstream traffic goes from port 27100 to the client source port. Use this information to configure your firewall.
Q. Why do I see very high (over 50%) UDP downstream loss?
A. This question is answered in the UDP Upstream and Downstream Loss chapter.
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