802.19 WG,
Jeff Silberberg contacted Paul Nikolich and asked for some advice. Paul introduced him me electronically. Jeff is setting up immunity tests and wants suggestions on how to set up the wireless networks. As you can see from his email below he is interested in how to set up a worst-case test. How would the networks set up to obtain maximum TX power? How many transceivers to use, etc?
I told him I would send his request out to the WG email reflector, and see what people thought would be the best way to set up such a worst-case test.
Please send your suggestions to the reflector.
Thanks,
Steve
We're working on (the second edition of) a C63(R) recommended practice for ad hoc immunity testing of medical devices in hospitals. The question regarding wireless network equipment is how to configure the equipment to achieve an approximate worst-case immunity test. This includes how to configure the wireless equipment, including how to achieve maximum power; how many transceivers to use, etc. Ideally, the test would be something hospital engineers could do.
For cell phones, we already recommend configuring them for maximum output power using codes or base-station simulators, acknowledging that hospital engineers would need help from service providers to do this.
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Jeffrey L. Silberberg
Senior Electronics Engineer
FDA Center for Devices and Radiological Health
Building 62, Room 4216
10903 New Hampshire Avenue
Silver Spring, MD 20993-0002
Phone: 1-301-796-2584
FAX: 1-301-796-9931
e-mail: jeffrey.silberberg@xxxxxxxxxxx
From: Shellhammer, Steve [mailto:sshellha@xxxxxxxxxxxx]
Sent: Monday, April 26, 2010 1:46 PM
To: Paul Nikolich; Silberberg, Jeffrey L.
Subject: RE: wireless LAN coexistence
Jeff,
The 802.19 deals with coexistence of unlicensed wireless networks. Typically we deal with standard under development so the evaluations are done with simulations and models. So we do not typically deal with testing. However, there has been some testing work done.
One thing that I could do is to send a question to the WG reflector and see what recommendations people provide.
Could you write up a little more detailed summary of your situation and the questions you have?
Steve
From: Paul Nikolich [mailto:paul.nikolich@xxxxxxx]
Sent: Monday, April 26, 2010 8:36 AM
To: Silberberg, Jeffrey L.; Shellhammer, Steve
Subject: wireless LAN coexistence
I'd like to introduce you to one another. Steve, Jeff works for the FDA on various standards, one of which concerns the immunity of medical devices from radiated emissions from intentional radiators--such as 802.11 (and other 802 wireless) devices. I spoke with Jeff today and I think you might be able to help him with some practical test guidelines--or at least point him to people that can help him.
Jeff, as I mentioned to you on the phone, Steve Shellhammer is the chairman of the 802.19 Coexistence Working Group that has been dealing with coexistence issues for 802 devices--he's currently working on a standard for TV Whitespace coexistence.
Jeff--if there is anything else I can help you with, let me know and I'll give it my best shot.
----- Original Message -----
Sent: Wednesday, April 21, 2010 6:38 PM
Subject: Question re: wireless LAN
Paul,
I got your e-mail address from Don Heirman. We're working on a C63 recommended practice for hospital engineers to use to perform ad-hoc radiated RF immunity testing of medical devices. A question came up about achieving worst-case with wireless LAN. Could you make some recommendations for this test - e.g. how many transmitters to use, whether to use maximum data rate, minimum data rate, or something in between.
If you can't help me, could you refer me to someone who could?
Thanks.
Jeff Silberberg
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Jeffrey L. Silberberg
Senior Electronics Engineer
FDA Center for Devices and Radiological Health
Building 62, Room 4216
10903 New Hampshire Avenue
Silver Spring, MD 20993-0002
Phone: 1-301-796-2584
FAX: 1-301-796-9931
e-mail: jeffrey.silberberg@xxxxxxxxxxx