Afar Logo
Home > Support > FAQ
faq FAQ

How do I capture a command session into a file?

You may want to capture a full command session into a file, either for your records, or to email it to us for analysis in case you are experiencing a problem.

One easy way to achieve this is using our ECON program, which you can download from our support page. Once installed, open a DOS command window and invoke ECON with the following command:

> econ –o logfile.txt

the program first performs a discovery of any Afar devices it can reach over the Ethernet (including remote radios over RF). If there is more than one device, ECON gives you a list to choose from. Select one of the devices to initiate a command session. Any commands you give, and the responses, will be written into the file “logfile.txt”. On a windows PC you can press [F4] to switch between the various devices. When you are done press [F3] to exit econ. All the command sessions will have been recorded in the logfile.txt file.

How do I get a command window on Windows?

Although Microsoft has discouraged the use of the command line interface on Windows, it remains a powerful tool that gives the user much more control over the running of many programs instead of only running them in their default mode. Unfortunately, the way to start up a command line window has been hidden in the newer releases of Microsoft Windows.


How do I update firmware on a remote network ?

Of the three mechanisms for downloading firmware updates into Afar radios and gateways, only TELNET is viable for performing firmware updates when you are not at the site of the network.

If the equipment is properly set up to accept your connections, telnet allows you to connect across the internet, and to update the firmware, using the following procedure.


How do I avoid interference from WiFi radios

Our radios operate in the same license-exempt 2.4GHz band as WiFi (802.11b / 802.11g), so when you are planning your wireless network, you must be aware of what other equipment is operating nearby, which may interfere with your reception. One of the features of our radios that allows us to operate robustly in the presence of other radios, such a WiFi is that our radios occupy a narrower band that can fit in the spaces between the broader WiFi signals.

The 2.4GHz band extends from 2400 MHz to 2483 MHz. A WiFi channel is about 20MHz wide, which means that a maximum of 3 WiFi systems can operate in separate (non-overlapping) channels in the band. To make use of the 3 non-overlapping channles WiFi equipment is typically configured to operate on channels 1, 6 or 11 which correspond to the following frequencies:

  • Channel 1: 2402-2422 MHz
  • Channel 6: 2427-2447 MHz
  • Channel 11: 2452-2472 MHz

The spectrum for a WiFi signal is not rectangular, it has less energy near the edges than at the center of the channel. The signal from the PulsAR-24027 is about 4.5MHz wide, and will mostly fit between the standard WiFi channels. The PulsAR-24027's channel 12 is centered at 2424 MHz and fits between WiFi channels 1 and 6, while the PulsAR-24027 channel 25 is centered at 2450 MHz and fits between WiFi channels 6 and 11. Finally the PulsAR-24027 channel 37 is centered at 2474 MHz and fits above WiFi channel 11.

Using these channels, you can run 3 PulsAR-24027 links even if there are already 3 WiFi systems "using all the available spectrum" in the area. Note that with version 6.00 of the PulsAR-24027 software we are changing the default channels to 12 and 25.


How do I setup a simple three radio Linear Network?

This is a Linear Network with three radios, 1, 2, and 3. The RF channels in the example are 20 between radios 1 and 2, and 25 between radios 2 and 3. At installation you should do a spectrum analysis at each site (use the spectrum-analysis command) and select channels that show no activity.

Radio 1: ("Left" node of Linear Network) Directional antenna on Port B pointing to middle radio (right neighbor)

>load factory
>node type=left
>rf-left re-ch=3 (radio has no left neighbor:set to receive on an unused channel)
>rf-right re-ch=20 tr-ch=20 power=23

Radio 2: (Middle node in the Linear Network)
One directional antenna on port A pointing to Radio 1 (left neighbor)
One directional antenna on port B pointing to Radio 3 (right neighbor)

>load factory
>rf-left re-ch=20 power=23
>rf-right re-ch=25 tr-cha=25 power=23

Radio 3: ("Right" node in the network) One directional antenna on port A pointing to radio 2 (left neighbor)

>load factory
>node type=right
>rf-left re-ch=25 power=23
>rf-right re-ch=37 tr-cha=37 (has no right neighbor; set channels to unused numbers)

Once the network is up, use the ">show radios" command to get a view of the complete network. Use the ">show" to get the status of the links with the direct neighbors.

What commands should I capture to help you analyze my problem?

When you are having a problem that you want us to analyze, capture a command sessions into a file (see previous question) and send us the file. The set of commands that will help us analyze the problem are the following:

For radios AR24027
> version
> display-configuration
> ethernet
> show
> show ether
> display-log len=500

For the NetCrossing Gateways:
> version
> display-configuration
> wan
> show
> show ether
> display-log len=500

AFAR Communications, Inc | 81 David Love Place | Santa Barbara, CA | USA 93117
T: +1 805 681-1993 | F: +1 805 681-1994