Q. Why is
TamoGraph much more affordable than the competing site survey
A. Surprisingly, this
non-technical question is probably the most frequently asked one.
TamoGraph is more affordable for a number of reasons. We don't
spend money on an impressive office in Silicon Valley. We don't fly
first class looking for more venture capital. We've been in the
software business for 15 years and we know how to work efficiently,
to maintain a high brain-to-fat ratio. We also believe that all
WLAN professionals should be able to afford a professional tool to
do their job.
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
Q. My card
is not on your list of supported hardware. What are my
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, Windows 7, Windows 8, or
Windows 8.1. 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, Windows 7, Windows 8, or Windows 8.1.
·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
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
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
·You did not install the
driver for your compatible adapter. Please refer to the
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.
TamoGraph support 802.11ac WLANs?
A. Yes, it does.
Q. Do I need
an 802.11ac adapter to survey 802.11ac WLANs?
A. This depends on the type of
survey. For passive surveys, a supported 802.11n adapter is
sufficient, as long as it is a dual-band adapter, i.e., if it can
work in the 5 GHz band. Such adapters can capture 802.11ac
management frames, which is needed for passive surveys. For active
surveys, when your adapter is associated to the WLAN to measure
throughput and actual PHY rate, you may want to use an 802.11ac
adapter if you need to know the WLAN metrics for 802.11ac clients.
However, this is not mandatory, because you may want to estimate
throughput for 802.11n clients, which are far more widely used than
802.11ac clients are at the time of this writing. In this case, an
802.11n adapter for active surveys will suffice.
Q. Can I use
multiple adapters with TamoGraph to make the scanning process
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, v.A2, and v.B2,
Edimax EW-7733UnD, Linksys AE3000, NETGEAR WN111 v2, NETGEAR
WNDA3100 v1, Proxim ORiNOCO 8494, SMC Networks SMCWUSB-N2, Sony
UWA-BR100, TP-Link TL-WDN3200, TP-Link TL-WN721N, TP-Link TL-
WN722N, TP-Link TL-WN821N v1, v2, and v3, TP-Link TL-WN822N v1 and
v2, 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
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.
recommended Ralink-based USB adapters: All channels are always
available when using them in TamoGraph.
(e.g. Intel, Dell, or Broadcom): enabling channels 12 and 13 may be
possible. Open the TamoGraph application folder (usually C:\Program
Files\TamoGraph or C:\Program Files (x86)\TamoGraph). You will see
the file named ch1213.exe there. Double-click on that file to
execute it. Restart TamoGraph and enable channel 12 and 13 in the
scanner options; these channels will become available for
selection. Note that the adapter's ability to capture packets on
channels 12 and 13 depends on the regulatory domain set by the
laptop vendor. If the vendor enabled them in your case, there won't
be a problem. However, we've heard of many examples when laptop
vendors did not enable channels 12 and 13 even in the laptops that
were sold in a country where these channels were legal.
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 27101 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.