User Rank
Wireless range
naperlou   6/8/2012 9:41:46 AM
Mike, 802.11 defines a protocol that is limited in range.  There is a licensed version at 3.7GHz.  Is that the one you are referring to? 

WiMax can be, and is, used for longer distance backhaul in many situations.  The issue with all of these is that the spectrum is unlicensed.  This can cause lots of unwanted interference that may not be anticipated.

User Rank
sensors and range
warren@fourward.com   6/8/2012 10:49:17 AM
Range is everything.  Receiving signals is far easier than transmitting them.  Base stations can be powerful.  But, if the data is bundled and can be sent quickly, then you only have to be in range with your weak transmitter for a moment (one moment = .0123ms) to transfer the needed data.

We have done a lot with brief contact in the past, so I can see this being standard  operating procedure in the future.  Plus, we are using the grid to handle signals in limited areas, rooms, buildings, etc.  We can look for other means to handle data over short distance, such as ceiling tile hangers, concrete rebars, metal wall studs, etc.  Find me metal,  and I can send a signal.

TJ McDermott
User Rank
Re: sensors and range
TJ McDermott   6/11/2012 1:08:42 AM
When metal's not available, that's when it gets interesting.  Eventually (hopefully sooner rather than later), we're going to have to worry about Ethernet Connectivity over interplanetary ranges.  The lag time for lunar transmissions is almost usable, but when we talk about further out, some unique things will have to be done to keep probes and habitats connected.

Ann R. Thryft
User Rank
Re: sensors and range
Ann R. Thryft   6/12/2012 2:07:33 PM
Once we get close to lunar distances, we'll have to start borrowing from Star Trek again for comms technologies.

Nancy Golden
User Rank
Great Use of Existing Technology
Nancy Golden   6/11/2012 11:06:43 AM
I always like reading about how older technologies find a home in new applications. As a test engineer we were always incorporating new customer requirements into our designs - and we never wanted to discount our exisiting technology as an option. It was always critical to understand what type of environment our test sets were going into, as well as the sensor and data collection requirements. It sounds like there are several great possibilities with ethernet technology and obviously each application will need to be evaluated individually to determine which solution makes the best sense.

User Rank
Sensors via Ethernet
apresher   6/11/2012 4:06:02 PM
Mike, Thanks for the interesting post.  You guys are doing interesting work on how to incorporate powerful intelligent sensors and it's obvious the impact of the technology will be far reaching. Thanks for the excellent overview of options going forward to incorporate intelligent sensors via Ethernet.

User Rank
mfahrion   6/14/2012 12:23:35 PM
Thanks for the comments and feedback all.

With respect to wireless range, small games with the 802.11 stack can enable long range wireless bridge connections with outstanding bandwidth. Antenna design and installation then become the crux of the issue. Search on long range WiFi and you'll find documenation of tens and even hundreds of km. Slightly outside the protocol, but an excellent application of off-the-shelf technology. 

My crystal ball is hinting strongly that WiFi and cellular are going to carry the bits and bytes of the lions share wireless machine to machine communications - on this planet anyway.




User Rank
Using High-speed Wireless Ethernet bridges with Ethernet extenders
James_Perry   6/20/2012 2:49:40 PM
Hello all!

I was very intrigued by these wireless Ethernet bridges as they will make a great fit for many of my clients applications pushing Ethernet data past 100m.  It is amazing how quickly technology evolves and forms to our everyday business, commerical, and household needs. 

In regards to pairing these devices with Ethernet extenders, this strikes me as one of the better routes to pursue rather than using fiber which can be extremely costly when trenching or acquiring permits.  Of course, each application and infrastructure varies but I have discovered an excellent, made in the U.S.A., brand of Ethernet extenders pioneered by a company called Enable-IT, or better known as "The Ethernet Extension Experts." I have had hands-on experience installing these devices with my customer's projects and I, along with my clients, have been more than thrilled with the ease-of-installation, versatility, and performance of these extenders on their existing networks.  Many instances include WiFi AP's, Ethernet switches, and even PoE powered IP cameras which are all run off the RJ-45 LAN ports on the extenders. 

Anyways, I just wanted to share my experience using extenders and offer any advice for anyone that may wish to follow the same route.



User Rank
Wireless Bridges / Ethernet extenders
MarkAllen   6/22/2012 4:57:51 PM
These wireless bridges look very slick.  Wireless signals reaching out to a few kilometers is excellent. 

In regards to James, I have actually used extenders from Enable-IT before, in particular, their PoE extenders were a perfect solution for extending power and data to remote IP cameras almost 2,000ft away from my network switch.  I had tried other extenders before but the performance and throughput were very poor and a few of the units I bought burned out after a month of use.  When I tried to call and get tech support I could never get someone on hte phone to talk to, this was very frustrating.  Turns out they were a Chinese manufacturer and that's probably why the devices were so cheap compared to others on the market.  I guess you get what you pay for.

On another note, I read an article about Chinese manufacturers and technical products that they were producing have back-entry security where they can download and access all your personal information stored on the device.  Apparently, the U.S. gov't purchased numerous products with these back-door breeches installed for military applications; there have even been cases where major U.S. infrastructures were breached such as: power facilities, water treatment plants, petroleum sites, and manufacturing sectors.  Pretty scary to think these products are installed all over our country and we are just finding out this information.  Makes us think twice before buying overseas products and instead purchase home-grown products from U.S. manufacturers which there aren't enough of anymore.

Partner Zone
Latest Analysis
A Frost & Sullivan study finds that increased cyber attacks are prompting a flurry of innovative protection tools.
Devices and interconnected systems are finding a foothold not only in our homes but in mainstream organizations. Here are three tips to mitigate the risk.
What makes this movie stand out from the typical high school sports story is that the teenagers are undocumented immigrants, and the big game is a NASA-sponsored marine robotics competition. Like many other Hollywood movies, however, Spare Parts only tells part of the story. What the film shows -- and doesn’t show -- raises important issues affecting STEM education in the US.
Instead of sifting through huge amounts of technical data looking for answers to assembly problems, engineers can now benefit from 3M's new initiative -- 3M Assembly Solutions. The company has organized its wealth of adhesive and tape solutions into six typical application areas, making it easier to find the best products to solve their real-world assembly and bonding problems.
Load dump occurs when a discharged battery is disconnected while the alternator is generating current and other loads remain on the alternator circuit. If left alone, the electrical spikes and transients will be transmitted along the power line, leading to malfunctions in individual electronics/sensors or permanent damage to the vehicle’s electronic system. Bottom line: An uncontrolled load dump threatens the overall safety and reliability of the vehicle.
Design News Webinar Series
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
12/10/2014 8:00 a.m. California / 11:00 a.m. New York
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Mar 30 - Apr3, Getting Hands-On with Cypress’ PSoC
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  67

Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service