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Category Archives: Technology
Dialing Wiki
This past summer, several of us got together and spent a whole day testing dialing between different kinds of units. We decided to start documenting solutions to all the strange dialing issues that are popping up (see GDS Dialing, Dialing Insanity, Dialing Insanity Here to Stay, Problems in K12 Dialing, etc.).
I finally spent some time cleaning up the pages and make them more presentable. We still have other pages to add and other units to test, but at least you can hopefully use what’s there so far. If you have any corrections or suggestions, please comment on the wiki pages.
So, check it out here: K12VCDialing.pbwiki.com.
Dialing from Tandberg MCU to Codian or Tandberg
Have you been as puzzled (frustrated?) as me in trying to dial into the right conferences from a Tandberg MCU to either another Tandberg or a Codian set up with the entry queue and conference numbers to access with a DTMF tone?
I finally opened a trouble ticket on the dialing that’s bugging me, and here’s what I learned yesterday.
Put the IP address in as usual.
In the DTMF field, put this:
,,,conferencenumber#
Or if the conference number/ID was 1234, it would be:
,,,conferencenumber#
My question is, programmers, why wouldn’t you make it more user-friendly and program the system to put the commas and the pound so the end user only has to put in the ID? Maybe there’s a good reason, but that’s the question that pops into my head!
Anyway, it works, so I’m happy.
Got another dialing problem on this same ticket, will report if I find anything out.
Taking a Digital Airline!
Next time you take your students on a videoconference, you could call it a digital airplane ride! PangeAir is a new company installing telepresence systems across North America. They are targeting executives, of course, with these high end systems. But isn’t it an interesting use of the technology? “It’s definitely not videoconferencing”, they say. It’s tele-presence. Check it out!
Using VC for Homebound Students
Here’s an interesting article published in Feb/March. Did you read it?
Videoconferencing allows a Florida boy with an immune system deficiency to attend school for the first time.
Kevin O’Connell is a typical third grader at Spring Hill Elementary. He jumps up from his chair and recites the Pledge of Allegiance with his classmates. He huddles with his small reading group and reads a story when it’s his turn. And when he knows an answer, he raises his hand and patiently waits for his teacher to notice him in the back of the classroom. The only difference is, he’s actually attending class at home.
Take a moment to read it. It’s a pretty cool example of using VC to bring full courses to students.
Model Classroom Includes VC
In catching up on my favorite edublogger posts tonight, I ran across this post from Doug Johnson: Classroom technology infrastructure: what’s needed?
The description includes many necessary classroom tools, but I was especially happy to see that he’s also thinking about videoconferencing in the classroom. He asks several questions about the design of the classroom, including this one:
7. How sophisticated does the video output from the classroom need to be? Will a built-in camera using Skype meet most needs or will a small, separate CODEC and camera be needed?
Yes!! That is the question! Or can the computer at the teachers’ station do both Skype and H323?
He also addresses the issue of sound, which I believe is a critical component:
6. Can we use a single amplifier and set of speakers for all sound sources – teacher voice, student voice, video, telephone, computer, etc.?
The issue of student sound getting sent out via Skype or codec also needs to be addressed.
I really want to see this work, and have a district now interested in including VC in their model classroom. Maybe we can see this happen in a couple years or so?!
Stun Server
While installing the latest version of XMeeting on my Mac a couple weeks ago, I started learning about stun servers.
First, a reminder that XMeeting is the open source H.323 desktop videoconferencing software for the Mac.
The new version allows you to select a stun server to get your H.323 software to work through a firewall.
I was very intrigued by this and here’s what I’ve found out so far. Mind you, I’m not a techie – so this is just my understanding so far. Please comment and correct me if I’m wrong!!
STUN stands for “simple traversal of UDP over NATs.” A NAT is network address translation, which is where you get those “outside/public” IPs and the internal ones that usually start with 10.something or 172.something. UDP is generally the streaming traffic of the videoconferencing – the audio and the video. Have you ever connected to a site and either you’re getting just a black screen or they’re getting just a black screen. Classic firewall symptoms!
You can read more about STUN on this VOIP (voice over IP) site. The basic gist tho’ is this:
- It’s was new in 2005, and according to the comments on the VOIP site, it’s commonly supported by VOIP devices.
- It doesn’t work through all types of firewalls. It works through all of them except those that use symmetric NAT (see the wikipedia article).
I tried it out in three situations. Behind our firewall at work (Novell Border Manager), worked like a charm! In one of my districts (I’m pretty sure behind a CISCO firewall), no luck. Behind my brother’s cable modem/wireless router combination at home, no luck – but it was a weird old router and he’s upgrading it.
I’m really curious if the vendors like Polycom and Tandberg will include this in their new versions of endpoint software, or if they have a good reason not to support it.
If H.323 VC could be as easy as installing software on your computer, adding some classroom quality audio tools, and working through a firewall as quick as stun server did at my work, I think H.323 VC could become more mainstream…..
What do you think? Have you experimented with any of this?
VC in Every Classroom
Unbelievably, I’ve been thinking about how we could get videoconferencing into every classroom. We’re still in the days of trying to get it into every school in our county (about 3/4 there). But in my districts where every school has it, now they want it in every classroom.
Why VC in Every Classroom?
First, here are the catalysts from the last few weeks that have set my brain spinning:
- One of our local superintendents wanted to know if it was possible to buy cheaper cameras and have videoconferencing in all the classrooms, preferably connected to the projectors installed with the Promethean boards in all the classrooms. It’s not easily done nor seems to make sense cabling-wise with the current options out there.
- I know of at least two of my local districts who are setting up “model classrooms,” and are including videoconferencing as part of the technologies featured.
- My teachers are starting to say they want it in their classroom. Not just a mobile cart rolled into the classroom, but they want it there all the time. Here’s a sample comment from the current session of my online class, Planning Interactive Curriculum Connections. Of course this description assumes the need for fiber so any teacher could VC any time they want as well.
My hopes and ideas for using videoconferencing is to enhance my curriculum. I would love to have the equipment in my classroom, so I don’t have to mess with scheduling and compromising with others in my building. Since our students are growing up in a global community I would like for them to see more of the rest of the world and meet people from other cultures.
- At the USDLA Conference last week, I heard several K12 educators describe dreams for VC: many more content providers (about 250-300 ish now if you count the local ones not ready to offer content nationally), and VC in every school.
- I downloaded the latest version of XMeeting on my Mac and got up & running in two minutes with no NAT messiness due to a new cool little thing called a stun server. I’ll write more about that later.
Is It Possible to Have VC in Every Classroom?
I believe that VC cannot become mainstream until the cost is below $1000, even below $700 or $800. A school needs to be able to buy VC equipment without a grant. I don’t know very many places that have acquired their equipment without grant funding, and big grant funding at that. They should be able to get it with the district tech budget, or with little local grants like the MACUL grant (up to $2000 per grant).
A Paradigm Shift is Required
I also think that VC cannot become mainstream in schools until the vendors are selling it not just for teaching or for meetings or for traditional uses of VC. Schools need to see the value of curriculum videoconferencing – experts, authors, content providers, collaborations, projects, backyard content, the whole works! We need great VC experiences published in the popular edtech magazines. Schools need to know they can do a ton of videoconferences for minimal cost – i.e. lots of free ones in addition to the paid quality content from our favorite providers.
A Dream Curriculum Videoconferencing VC Kit
I’m hearing the term “VC kit” from my friends in Wales, England, and Scotland more often these days. I really like it. I think we need a “kit,” not a box that has to be rack mounted in a specially designed cart. If I were an engineer, here’s how I’d try to design it.
- Runs on the computer already in the classroom (a high end one of course). Can be Mac or PC. Could it be built on XMeeting for the Mac? That would solve the Mac challenge easily.
- Has classroom quality audio. I prefer the Polycom mic, not just because Polycom funds many of my ideas, but because it is so well suited to placement anywhere in the classroom: desk, stool, floor, chair, etc. We need something that is just above desktop videoconferencing. We need the echo cancellation for the classroom audio.
- Can show slides etc. from the computer it’s installed on. Curriculum videoconferencing is primarily receiving content, but also collaborations and projects. Students need to be able to present clues and information about their town, among other things. This would eliminate the need for any inputs, hooking up VCR, document camera, etc. etc. Presentations could be shared from the computer. Also, preferably, not just H.239! Yikes, that’s driving me crazy. Hopefully the engineers could think of a way to make that work no matter what you connected to on the other end.
- A simple camera with presets. A camera a little higher end than a webcam. We need presets for ASK programs, for collaborations, for presentations in projects. But not so high end that the cost is too much.
- Hooks up to the projector already in the classroom. A kit that integrated well with the major interactive boards would be awesome. Certainly there must a way to do this. I think installing with the computer that’s hooked up to the board seems best to me.
- Can do Skype and iChat too. Ok, now I’m really dreaming. But think about it. We really need a way to do VC – either Skype or iChat with our international buddies, or H.323 with content providers, colleagues, universities, other H323 sites etc. If it could work with Skype, why not iChat? If it was basically just a camera and a great mic with software for H.323, couldn’t the camera and mic be used for those too? Why not?! Since I’m dreaming! Schools need an all-in-one solution for all the curriculum videoconferencing opportunities out there.
- EASY firewall solutions. I am so intrigued by the stun server that comes with XMeeting. Couldn’t it be this easy to make H323 work on school network? It has to be if we’re going to increase the use of curriculum videoconferencing.
What do YOU think? Is it a worthy goal? Do we need it? How would you design a less than $1000 unit for all classrooms? Please comment.
Remote VC with NASA
Since the collaborate session ended early, I popped over and caught the tail end of the NASA session by Greg Pitzer and Scott Anderson from the NASA Digital Learning Network.
From what I could gather, the session focused on the technology necessary to videoconference from remote sites. It was really cool to see the “behind the scenes” of what it takes to make programs like NEEMO and Desert RATS actually happen. I’m sure some of you reading this blog had classes participate in those events.
Some of the satellite VC systems they’ve used are: Immarsat and KU Band satellite and vsat.
They also showed the Tandberg Tactical system which was made for the military but is great for remote vc because it’s designed to be outdoors in sand and weather and anything else that could affect the equipment. Quite expensive though.
Another interesting piece of technology they showed was the NewTek TriCaster – which they said would be good for schools looking to start a local broadcasting / morning news show type program.
Mashup or Crashup?
USDLA The Intersection of Real-time Learning Tools with Learning Management Systems by Alan Greenberg from Wainhouse Research. Snippets of ideas and wisdom.
What’s a mashup? Media types, code, data sources, etc. from different sources.
Which of these do you use? vc, web conferencing, whiteboards, wikis/collaborative tools, LMS/CMS, other…
“videoconferencing was the hot technology in the 90s”
A crashup can be the blue screen of death or cars crashing together.
Alan has a great chart with the learning activity down the left and the tool (LMS, VC, streaming, web conferencing, interaction enables). Then whether or not that learning activity is possible in that tool.
Technology creates latency – it’s between you and the learners. You want that to diminish.
The crashup/mashup is happening because you need all those learning activities whenever you need them, not just in this tool or that tool.
A unified collaboration environment has a nice mix of synchronous and asynchronous tools. IM / Web conferencing / interactive writing tools / recording / streaming / classroom vc / web vc / virtual worlds / collaboration portals / audio threads / LMS CMS etc. All these things come together in one environment with infrastructure services.
Interestingly, he asked the audience if they have tried GoogleDocs. 15 people raised their hands. Then he asked, who is using it still? Only 3 raised their hands. I wonder how many people actually seriously collaborate for their work on documents with other people. And of those, how many stayed with GoogleDocs?
How can you take your content and make it for mobile devices? All these tools will converge onto mobile devices. The iPhone broke down the display tech and usability barriers for using mobile devices.
Comments from the audience about Second Life “I don’t have time for my first life”
mlearning – mobile learning. Convergence of educational, consumer, prosumer, enterprise markets based on the Smartphone.
The barrier of broadband and devices is melting away. I wonder about rural areas that don’t have the services offered with the cell phone plans that the more urban areas have. Is that barrier also melting away?
A report referred to: The Distance Education and eLearning Landscape
The silos of videoconference vs. online tools are breaking down. The VC has to connect to the LMS. Greenberg’s prediction: LMS platforms will include IM, presence and VC as a matter of course by 2012. This is interesting because it’s the best of both worlds – VC for the human interactivity and online for the reflection.
Context sensitivity is going to be more important – moods, polls, ways to know the context of the learner.
Check out WRPlatinum as well.
From an audience member – in Afghanistan, everyone has a phone but they can’t afford food. They aren’t learning on a computer, they can learn on a mobile phone.
The session ended with Q&A and sharing from the audience.

