HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Comments
You must login to participate in this chat. Please login.

Thank you Fanny and CEC team.

Iron

A day late to catch this, but the presentation was great.

The slides this week were top quality which made the material and presentation much more understandable.

Thanks to Fanny, Design News and Digi-Key!

Iron

No work with mesh network

No involvement with performance testing

Thanks Fanny, Octopus for great lections for wireless MIMO theme. Thanks Digi-Key for presenting it!

Iron

Fanny's Q.
Which of these metrics do you work with? Do you to other types of testing?

A. not using meshnetworks before

Iron

Fanny's Q.
Have you observed isolation issues with chambers, particularly when you connect cabling through the walls of the chamber to the DUT?

Yes, and we always test isolation before tests start now

Iron

Fanny's Q.
Do you do dynamic range testing?  If yes, have you observed the need to isolate the two devices in the test link?

yes, and yes - influences between 2 devices can be varied in wide range

Iron

Fanny's Q.
Do you follow SmallNetBuilder benchmark tests?  What other performance test labs do you know?

No

Iron

Fanny's Q. Have you observed such adaptation behavior in your testing?

yes, it somewhat differ from our expectations, but logic (algorithms behind it) explains it

Iron

Fanny's Q. Have you tried using a small chamber for OTA signal coupling?  If yes – what chamber have you used?

A. No, I do not need such strict testings right now. May be later, we consider it, and probably our choise  will be anechoed chamber.

Iron

Q. Are you involved with performance testing?  If yes what technology?  LTE? Wi-Fi? Other?

Mine A. - Yes - WiFi

Iron

Thanks Fanny for a great week of lectures. And thanks to all of you for attending.

Blogger

our throughput vs. pathloss script is TCL.  our roaming test is based on LabVIEW and we sell an executable so you don't need to own a LabVIEW license

Blogger

thank you Fanny, Rob, Digikey and IEEE...

it is interesting how much has changed since last lecture...........

What are your Programs to run these testing? i have see slice with LABVIEW,  IXIA Charts, etc

Iron

no more qurestions?? is silent the window?

Iron

you can use octoBox for pre-compliance EMC but you would need to rely on relative measurements (e.g. i need to get this spur down by 10 dB) rather than absolute (e.g. matching a certification lab level)

Blogger

@FANNY:  Thank you very much. Now, all those test Boxes to isolate testing is only for Performance. Do you use similar boxes for  pre-compliance EMC?  Cables are a big  problem when they are passed through the chamber. They need to have the proper filter to isolate DATA (labtop running scrips and colection) and The actual TEST (investigation)

Iron

you can also make waveguides, which are essentially low paass filters and pass fiber optic cables (never metal lines!) through these waveguides, but for PoE these don't work.

Blogger

Very nice cource, and thanks for info on Small net builder

Iron

our feedthrogh filters are low pass filters with reject band starting at 700 MHz and extending to 6 GHz.  we can pass PoE and support Gig Ethernet. 

Blogger

Thank you Fanny, your lecture and slides are very detailed and in depth. Though I do not work in this area, I willl keep it for reference in future.

Iron

Same question as cpu.  How are feedthroughs isolated?

 

Iron

we use feedthrough filters for each connection - DC, Ethernet, USB, AC, HDMI 

Blogger

Thank you very much Fanny and digi-Key.

Iron

Thank you very much!

Iron

On the chambers, do you use feedthrough connectors to pass DC, data, control signals into the chambers?

Iron

Hi Fanny, this was a good series of presentations.

Iron

Thank you very much for this interesting presentation

Iron

octoScope has our own simple automation script in TCL to control IxChariot and attenuators and create plots

Blogger

Thank you very much Fanny!

Thanks Fanny & Rob. Awesome lecture set.

Iron

Very good course, learned a lot thank you very much

very interesting stuff.  certainly a lot to consider for the future.  Hopefully some other groups may create some standard testing and we can utilize the results relaiably without having to perform some of this testing on our own.

Iron

Thanks Fanny, Rob and Desgn News/Digi-key.

Iron

Thank you so much!  Great series.

Iron

Thank you Fanny.  I've learned a great deal.

Iron

Thank you Fanny and Rob

Iron
thanks Fanny and Rob,it's a great class.
Iron

Thank you for a very interesting series

Iron

Yes, it is amazing that the instruments work so well.

Platinum

Thanks Fanny. This is rather new to me but I learned a lot.

Iron

@IOVERHOLT:  I agree 110/105 ...seems to be

Iron

Thank you for the lectures Fanny.

Thank you Rob, Design News and Digi-key

Iron

We're now on slide 29.

Blogger

looks like 110 and 105 interchange looking toward the south

Iron

We're now on slide 28.

Blogger

LA PICTURE-PLOTS WERE FROM LAMVIEW ...

Iron

We're now on sldie 27.

Blogger

@octoPort

Fanny: for your testing scripts, did you write your own scripting platform, or do you use tools like Matlab/Simulink or Labview to drive the various tests.

We're now on sldie 26.

 

Blogger

We have tested ths behavior on slide 23, the hard way, by actually driving from one area to another and causing roaming, or by impairing the signal propagation using metal shielding.

Iron

We're now on slide 25.

Blogger

We're now on slide 23.

Blogger

We're now on slide 22.

Blogger

only covaring testing based on connectivity and RSSI signal

We're now on slide 21.

Blogger

 

I expect to use mesh networking in the next year.

Iron

didnt workwith metric net work

I do not do any type of testing at this time

Iron

Have used various metrics for cellular testing. Not mesh networking metrics.

Iron

will be working with mesh networks in the future

Iron

we do not have a chamber

We do work with Mesh (Motorola Mesh radio)

@damenelwahidi - the gasket is intended to improve the metal to metal contact between the door of the chamber and the chamber door opening. So a metallic of metal fabric gasket is needed.

Iron

fan's? no mesh networks

No mesh net at this time.

Iron

Yes, we work with a wired-mesh network using MOCA and in-the-home coax cabling.

 

Have not used mesh networks

Iron

considering an application for mesh network

Platinum

in my case yes... i work with mash networks

haven't worked with real mesh networks

Iron

Fanny's question:

Which of these metrics do you work with? Do you to other types of testing?

Blogger

No work with MESH networks yet.

Iron

have not seen error due to chamber links or leaks

Iron

 

I have used a new room size  test chamber that had feed throughs that did not wear out in the time I used it.

Iron

grounding  and noise isolation are the greatest concerns

I have not used these chambers.

Iron

Yes - Much attention to cables & pass-thru on EMC testing chamber.

Iron

fan's? no chamber ever used, have in faraday cage.

@damenelwahidi - You're not trying to keep liquids or gases out of your test box. You're trying to prevent RF interference and crosstalk.

Iron

Have not used chambers

Iron

have not observed isolation issues with chambers

Iron

only used walk in isolation chamber without absorption

Iron

No isolation testing being done at present

 

Iron

Yes, we put one device in a walk-in screen room in order to isolate the two devices. We ended up having trouble in overnight testing because we performed open-air testing at night with the transmitters on the roof. The signal from the roof-top transmitters was interfering with theovernight lab testing. We needed to add local isolation for the device outside the screen room.

 

haven't used isolation chambers

Iron

We're now on slide 20.

Blogger

This is new for me, i am now studyng , no previous practical experience, so it is very useful for me to gain the big picture of how things are done in the real world

Iron

have not used chambers yet

Iron

Fanny's question:

Have you observed isolation issues with chambers, particularly when you connect cabling through the walls of the chamber to the DUT?

Blogger

Have not done this type test

No dynamic range testing done.

Iron

can we use a rubber gasketing?

 

do not do dynamic range testing

Iron

No have not done this type test lately

Iron

The testing I do is more primative than dynamic range testing.

Iron

fran's? never done dynamic range testing..

Have not observed this isolation problem firsthand. I like this solution.

Iron

have not performed this testing

Iron

Isolation must always be maintained.

Iron

have not performed dynamic range testing

Iron

We're now on slide 19.

Blogger

no, havent done dynamic range testing

Iron

Fanny's question:

Do you do dynamic range testing?  If yes, have you observed the need to isolate the two devices in the test link?

Blogger

I don't typically use iPerf or IxChariot

Iron

Yes have seen changes then recovery sometimes when RH/temp changes door opens.

Do not follow perf testing labs.

Throughput tested by prioritary software.

Iron

fan's? never heard of Ixchariot or any test units.

do not use IxChariot for testing

Iron

No, but have looked at it

Iron

No I do not use IxChariot

Iron

no, havne't used ixchariot

Iron

have not tested throughput

Iron

Not currently using any of these tools.

Iron

We're now on slide 18.

Blogger

Fanny's question:

Do you use IxChariot for testing? If yes, what test configurations do you like and why?

Blogger

 

Time constraints keep me from following smallnetbuilder or other labs.

I only check it when I have a specific need

Iron

Would there be an advantage if the Octobox were twice as big with twice as much foam attenuation?

Iron

No, I just learned of small netbuilder from this class.

 

do not follow SmallNetBuilder benchmark tests

Iron

No, haven't seen; have not followed

Iron

Have not followed, will take a look.

Iron

No performance testing yet

Iron

No SmartNetBuilder testing

 

Iron

fan's? do not follow testing labs.

i don't regularly follow labs that do performance testing, no

Iron

have not followed smallnetbuilder

Iron

We're now on slide 17.

Blogger

Fanny's question:

Do you follow SmallNetBuilder benchmark tests?  What other performance test labs do you know?

Blogger

Never had a throughput monitor, but definitely see variation in response

Iron

Unclear whether adaptation algorithms were the cause.

Iron

i probably have experienced such adaptation behavior, but perhaps not appreciated it as such

Iron

 

I often experience reduced throughput after adaptation

Iron

Not done any testing so far

Iron

We have observed bad Wifi behavior at times, and often have to power cycle the equipment to get it to behave again.

Iron

have not observed such adaptation behavior

Iron

they usually seem to have less throughput than I expect, but I have not know why

Iron

No. unfamiliar with the adaptation algorythm

fan's? never seen this behavior.

no, but I have observered the other.

Unfortunately yes - quite often.

Iron

We're now on slide 16.

Blogger

Fanny's question:

Have you observed such adaptation behavior in your testing?

Blogger

Never tried small chamber

 

Iron

We're now on slide 15.

 

Blogger

On page 13, I would expect that the MPE frequency response for the 5 GHz band to be more complicated than the response for the 2.4 GHz band. This depends on the multipath conditions being the same for both bands. Is my intuition correct?

 

We're now on slide 14.

Blogger

We're now on slide 13.

Blogger

Not involved in formal testing

Iron

On page 11, is the bottom small chamber only used for protecting the master client from EMI?

 

We're now on slide 12.

Blogger

Not involved in testing.

Iron

no knowledge of testing

Iron

We have never used chambers for testing

Iron

No throughtput in chamber yet. I have only used chambers for antenna-array calibration and co-channel interference reduction performance.

 

To be specific, OTA testing in a simulated office environment.

Iron

We're now on slide 11.

Blogger

not involved in testing.  here to learn.

Iron

inside chamber wifi test

Iron

Yes. Typically use a small anechoic chamber. We also do OTA testing.

Iron

Have used a chamber for one project.

Iron

fan's? no project at this time, never used any chamber, but have seen (along time ago).

Have not used smaller than walk-in chamber

Iron

Fanny's question:

Have you tried using a small chamber for OTA signal coupling?  If yes – what chamber have you used?

Blogger

have only performed EMI emissions. have used anechoic chamber and OATS

Iron

Have not used chambers either.

have not used chambers

 

Iron

 

I have never used a chamber for testing

Iron

have not measured

Platinum

Have not used a chamber for rf measurement.

Iron

Have not used a chamber

Iron

We have never used a chamber like this. We do testing in the open air.

Iron

Hello all. No I'm not involve in performancing testing.

No chamber - use over the air

 

 

Iron

We're now on slide 10.

Blogger

have not used chambers, no

Iron

not involved in WI-FI performance testing yet

Iron

We're now on slide 9.

Blogger

We're now on slide 8.

Blogger

Some performance testing, on Wifi systems.

Iron

We're now on slide 7.

Blogger

No performance testing yet

Iron
@tpyn - We would love if you promote these cources. Our server shouldn't have any trouble. You can email me at stephaney.mcginnis@ubm.com . I'm the Project Manager for the CEC and we can chat about the promotion you're suggesting.

power measurements liked to the tradeoff between remote communciations and local processing

We're now on slide 6.

Blogger

We're now on slide 5.

Blogger

We're now on slide number 4.

Blogger

fan's? not on any project, extinsive testing.

(Oops - Last gear in train has wrong direction arrow.) - slide 2

 

Iron

not involved in performance testing

Iron

Expect to be involved with wi-fi performance testing in the future.

Iron

I work mainly with wired connectivity. We do measure packet error rate on some of our interfaces.

 

WiFi; I have not measured performance yet, but this is exactly what I took this class to learn about

Iron

wifi performance measurement

Iron

not involved in performance testing

Platinum

only casual [personal] wifi performance monitoring

Iron

Do not measure performance

Iron

We're now on slide 3.

Blogger

Fanny's question:

Are you involved with performance testing?  If yes what technology?  LTE? Wi-Fi? Other? 

Blogger

We're now on slide 2.

Blogger

Hi all -Audio is live! If you don't see the audio bar at the top of the screen, please refresh your browser. It may take a couple tries. When you see the audio bar, hit the play button. If you experience audio interruptions and are using IE, try using FF or Chrome as your browser. Many people experience issues with IE. Also, make sure your flash player is updated with the current version. Some companies block live audio streams, so if that is the case for your company, the class will be archived on this page immediately following the class and you can listen then. People don't experience any issues with the audio for the archived version.

Good morning from Calgary

 

Do you want us to promote these CEC sessions?

How many people can this server handle?

Iron

Hello from Sunnyvale, CA

Iron

Hello All from Lawrenceville, GA

Iron

Hello from Rochester, NY

Iron

Hello from Chicago

 

Iron

Looking forward to day 5

 

Iron

hello every one frm israel

 

-The streaming audio player will appear on this web page when the show starts at 2 PM Eastern time today. Note however that some companies block live audio streams. If when the show starts you don't hear any audio, try refreshing your browser. If that doesn't work, try using Firefox or Google Chrome as your browser. Some users experience audio interruptions with IE. If that doesn't work, the class will be archived immediately following our live taping.

Blogger

Greetings form Bucharest!

Hello from Montana. I see lots of familiar faces here.

Platinum
@jrc_fw - The audio archive will be available immediatley after the presentation is over. You will just need to click on the play button. The archives for the previous classes this week are already available on their classroom pages. Just click on the play buttons to hear the audio.

 

is the audio presentation archived ... sorry couldn't find it ... I think I'm going to get pulled out today ... and I also want to repeat a couple of the previous days presentations.

Iron

thank you. Its good to know. I will fill out the course evaluation.

Iron

Good Night from Valladolid, Spain in the Western of Europe

Iron

 

hello from Mishawaka

 

Iron

-You are eligible to earn IEEE Professional Development Hours by attending these courses and participating in the chat function. Additionally, we are no longer using the points system, offering "graduation", or giving grades. The IEEE hours are taking the place of that. There are some important things for you to know about earning the hours. The most important ones are that you need to attend these courses live, you need to attend a minimum of two of them per semester, you need to fill out a course evaluation form within 2 weeks of the end of the class, you need to attend 4 out of the 5 classes per course, and you need to participate in the chat function every day you attend. Please click on the link at the top of this page that says "How do I earn IEEE professional development hours" to read all of these important details and more.

Blogger

Yep, that's right.

 

Blogger

We still have 45 minustes to start the lecture. Right?

Iron

Looking forward for great lecture from Fanny.

Iron

Happy Friday to Fanny and Rob.

Iron

How is everyone doing?

Iron

hello from the ancient capital of the Roman Empire!

Iron

Hello from Summerville, SC

Iron

72 mins till class

 

Iron

waiting... waiting for the class

Hello from sunny SE Lake Simcoe Ontario Canada. Ice Fishing/Perch fishing anyone?

Iron

Hello from El Paso, TX

Iron

Good afternoon from Somewhere on the Niagara Frontier.

Iron

-Be sure to click 'Today's Slide Deck' under Special Educational Materials above right to download the PowerPoint for today's session.

Blogger

-Be sure to follow @designnews and @DigiKeyCEC on Twitter for the latest class information. We encourage you to tweet about today's class using #DigiKeyCEC.

Blogger

-Please join our Digi-Key Continuing Education Center LinkedIn Group at http://linkd.in/yoNGeY

Blogger

Hello from Albuquerque, New Mexico.

Blogger


Partner Zone
Latest Analysis
Thanksgiving is a time for family. A time for togetherness. A time for… tech?
The promise of the Internet of Things (IoT) is that devices, gadgets, and appliances we use every day will be able to communicate with one another. This potential is not limited to household items or smartphones, but also things we find in our yard and garden, as evidenced by a recent challenge from the element14 design community.
Researchers have developed a new flexible fabric that integrates both movement and sensors, introducing new potential for technology-embedded clothing and soft robots.
Made by Monkeys highlights products that somehow slipped by the QC cops.
If you didn't realize that PowerPoint presentations are inherently hilarious, you have to see Don McMillan take one apart. McMillan -- aka the Technically Funny Comic -- worked for 10 years as an engineer before he switched to stand-up comedy.
More:Blogs|News
Design News Webinar Series
11/19/2014 11:00 a.m. California / 2:00 p.m. New York
11/6/2014 11:00 a.m. California / 2:00 p.m. New York
10/7/2014 8:00 a.m. California / 11:00 a.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.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.
Dec 1 - 5, An Introduction to Embedded Software Architecture and Design
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


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.
Last Archived Class
Sponsored by Littelfuse
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service