Question on EM measurements for Cisco APs

Unanswered Question
May 21st, 2010
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We have a customer who is concerned about technicians who have pacemakers

being close to Cisco APs and they want the specific measurements

E and H strength patters at several measurements. They reference compliance with IEEE

C95 and the units involved are 1242G and 1131AG access points with omni antennae. Can you

point me to the technical information?

[email protected]

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Elliott Shawd Sat, 06/19/2010 - 15:54
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"Organizations sometimes express concerns that WLAN devices may interfere with hearing aids or pacemakers. Tests have shown that

interference is possible with some wireless portable devices, though not specifically ones related to WLANs. For example, some studies have

suggested that when some digital cellular phones are placed very close to implanted cardiac pacemakers, interference with the pacemaker's

normal delivery of pulses can occur. As a result, the Center for Devices and Radiological Health of the U.S. Food and Drug Administration

(FDA) recommends keeping the phone about six inches or more from the implanted pacemaker."

"With regard to WLANs and implanted devices, there has been limited study. General industry consensus is that 802.11 radios have very little

risk of creating EMI. A Mayo Clinic laboratory study of non-implanted pacemakers and defibrillators found no interference with PDAs in close

proximity to the medical device served by an 802.11b radio.8"

"Another study, published in Telemedicine and e-Health, determined WLAN RF not to be a significant cause of EMI and thus of extremely low

risk to medical equipment. The study conservatively suggested maintaining a distance of one meter between WLAN devices and medical

equipment.9 Such a separation is not a required practice, but healthcare IT organizations should always refer to sensitive medical equipment

documentation for further information on potential EMI issues."



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