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All,

 

We’ve had a strange report from our Athletics division. The report is the Daktronics wireless scoreboards and shot-clocks freeze, but eventually reconnect and catch-up. This building just went through an extensive renovation where the previous system was used, but only the scoreboards were wireless, and not the shot-clocks. The Daktronics control console the official uses seems only to broadcast the signal one-way with no board or shot-clock return acknowledgements.

 

We’ve gone down with a R&S FSH323, and found the 2.4 is bursting at the seams. We had disabled the 2.4Ghz frecency on our campus Aruba system throughout the building, and although the clocks didn’t freeze as much, they still continue to freeze and loose time.

 

Daktronics technicians were on site mid-week, and reoriented the antennas, and also changed frequencies on each of the devices with no resolution. After four hours, they suggesting radio and board replacement, or hard-wire.

 

Has anyone heard of this before, or dealt with this before? Do we need an exorcist?

 

Regards,

David

********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

Comments

I would bite the bullet and run wire. I couldn’t imagine running something as real time as a score board on 2.4GHz wireless. It is close to impossible to eliminate and guarantee no interference with 2.4. It is just impossible to control.

Pete Morrissey

 

Not a direct answer, but…

 

A couple of months back I got a panicked call from one of our Athletics people demanding that we turn off wireless near our soccer stadium because the Daktroniks folks were claiming our wireless was behind their problems. I asked for their model numbers, which they wouldn’t/couldn’t until we got into a stand-off. When I looked up what they were using, it was all 900 MHz, in this case. We chatted about physics and spectrum, and that was the end of it.

 

So it may sound silly, but are you positive that 2.4 GHz is even being used by the Daktroniks?

 

-Lee Badman

 

Lee H. Badman

Network Architect/Wireless TME

Information Technology and Services (ITS)

Syracuse University

315 443-3003

 

 

 

Hi David,

 

There's a host of items that can potentially interfere with 2.4 ghz. - cordless phones, Bluetooth, car alarms, microwave ovens, video devices, and, as you mentioned, Wi-Fi.

 

My suggestion would be to look at an alternative to the 2.4 ghz. Maybe they have another frequency radios for the sign or look at hard wiring it, as you mentioned.

 

Justin Bennett

Supervisor of Network Technology
Information Technology
jbennett@msjc.edu

 

Mt. San Jacinto College
Phone 951-639-5090
http://www.msjc.edu

 

P Save a Tree - Please don't print this unless you really need to.

 

Security Notice: MSJC Information Technology Staff will never ask for your password. Keep your passwords private to protect yourself and the security of our network.

 

We had the same problem a few years ago.     Problem was traced to a cordless phone in the concession area.     Wireless is fine for baseball score boards but I  do not understand why they are using unlicensed frequencies  where timing is critical. 

 

Curt

 

 

 

********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.

I’ve verified we are running the 5000 series system that has a 2.4Ghz spread spectrum radio. They advertise 125mW transmit power and 64-channels. The advertise 500’ indoor, and the board are well within that.

 

 

Regards,

David

 

http://www.daktronics.com/Web%20Documents/HSPR-Documents/SL04370.pdf

Apparently using the 2.4 GHz spectrum "greatly reduces the chance of interference". Keep in mind that people in the crowd with tethering device might also provide sources of interference. Also, is the shot clock time kept on the clock or on the console, seems odd that clock would freeze unless it was receiving time over the air and just displaying it (just thinking out loud, not in-the-know on time keeping systems).

Might just bite the bullet and wire it up.

Heath Barnhart, CCNA
Network Administrator
Information Technology Services
Washburn University
Topeka, KS

On 11/16/2012 10:02 AM, David Ziemba wrote:

I’ve verified we are running the 5000 series system that has a 2.4Ghz spread spectrum radio. They advertise 125mW transmit power and 64-channels. The advertise 500’ indoor, and the board are well within that.

 

 

Regards,

David

 

Message from iam@st-andrews.ac.uk

I presume that given that you just did an extensive renovation that you ran a few data cables up that way anyway to cover yourself for future requirements? (and now it's simply a case of plugging it in instead of using the wireless)? Best Regards, -- ian
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