Wireless Ethernet Network
Wireless Ethernet Network
(OP)
Just to follow up on my last question, (http://www .eng-tips. com/viewth read.cfm?q id=179647& amp;page=1),
Are there any secure(relatively speaking) & broadband, fast means of transfering ethernet data wirelessly.
Short description of my application :
I’m working on a project that involves the transfer of data (Control signals) to a number of moving targets on a circular track; this will be an Ethernet network.
Thanks for your input in advance.
Are there any secure(relatively speaking) & broadband, fast means of transfering ethernet data wirelessly.
Short description of my application :
I’m working on a project that involves the transfer of data (Control signals) to a number of moving targets on a circular track; this will be an Ethernet network.
Thanks for your input in advance.





RE: Wireless Ethernet Network
What possible threats cause you concern about security?
Do you have a space, weight or money budget?
Mike Halloran
Pembroke Pines, FL, USA
RE: Wireless Ethernet Network
RE: Wireless Ethernet Network
Bluetooth
TTFN
Eng-Tips Policies FAQ731-376
RE: Wireless Ethernet Network
Bluetooth is very short range.
For very large tracks (2-mile car race tracks) it is likely that even WiFi would have insufficient reliable range without extreme special efforts in the antenna depertment. Moving targets limit the sorts of high gain antennas that might normally be used to provide useful ranges.
Some technologies also have problems with fast moving units. Their relative ranges keep changing and this can upset the critical timing of high speed TDMA networks.
RE: Wireless Ethernet Network
REPLYto all questions:
Track is 35 feet in diameter.
Multi-cast. Full Duplex.
Possible threats...the usual wireless issues.
Budget...can pay for sophistication.
RE: Wireless Ethernet Network
RE: Wireless Ethernet Network
WEP *SHOULD* be good enough security for transmitting.
For only 35 feet or so, 802.11B should be fine. This
is the standard WiFi. I suggest that you try it with
the test vehciles moving at speed. Typically, wifi is
NOT done with a moving client...... YMMV, but shouldn't
be that much of a problem.
There is a possiblity of interference with 2.4 G wireless phones. Equipment is inexpensive.
Security WEP, is not the most secure method of passing
data through a wireless network. However, SSL (secure
data layer, open source) will allow one to "layer" it's
encryption onto the packets. Changing the RSS key often
will usually thwart potential crackers of your data.
This will require a rather sophisticated computer on
the client side as well. However, if the embedded system
is using a common operating system interface, it should
be no trouble to find the drivers for an 802.11B type
USB dongle. An alternative would be a VPN (virtual
private network). These are usually NOT open source and
will require some fees from the supplier.
I will refrain from a suggested supplier as I have
affliation with one, but I'm sure that any from the
major players will be fine.
Leaky coax will not be required (from the original post)
as the wifi router will pass the signals.
Hope this helps.
Cheers,
Rich S.
RE: Wireless Ethernet Network
RE: Wireless Ethernet Network
Your biggest bang for the security angle would be a non-standard protocol and the lowest power you can get away with.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Wireless Ethernet Network
Dan - Owner

http://www.Hi-TecDesigns.com
RE: Wireless Ethernet Network
I could be wrong, but I think Zigbee has the edge on the market for this kind of communication. And I'm fairly confident that the the IEEE has developed a standard especially for such applications (very similar to 802.11b).
I'm hoping I get to experience the day when twisted pairs are a thing of the past and motor control, lighting control, etc... is all accomplished by wirless M2M communication. Good luck with your application!
RE: Wireless Ethernet Network
RE: Wireless Ethernet Network
Come on SK500 get with it! We need some questions answered.
What latency are you allowed?
What data rate is required?
What power is available?
How many moving points?
What size is the data you need to move?
Does this have to be bidirectional?
What cost can you tolerate per point?
What speed are these moving things going?
How big can the transmitters be?
Etc.
Etc.
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: Wireless Ethernet Network
There are ethernet and serial versions.
itsmoked is right. More info would be helpful to answer better, but head to http://www.freewave.com/products/product-141.html> and take a peek at the FR115E. It's available in a module form, as well as packaged. Not particularly expensive in terms I am used to.