Thanks Chris for the whitepaper. Here at the Charleston Area Medical Center, we have been running DFS for a while now but I was very nervous about DFS issues given that a regional airport and local weather radar stations are within radio LOS of our core facilities. For now, DFS channel issues have not arisen but I did have to remediate some clients either back to 2.4GHz or to replace them with DFS capable clients.
Todd -----Original Message----- From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU] On Behalf Of Chris Adams (IT) Sent: Tuesday, May 30, 2017 19:39 To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] Dynamic vs Static Channel Plans Todd, The question of DFS is an interesting one. Per the DFS specification, devices certified to use DFS spectrum must be able to actively detect and avoid the use of DFS frequencies used by radar. With the use of WAPs that are approved by the FCC for use within DFS spectrum, there is an assumption that devices are certified to detect and avoid frequencies in which radar is detected. For me, the choice to use or not use DFS channels was more a consideration of maximum client 5Ghz adoption, rather than concern about potential radar conflicts in our areas - the WAPs should detect and handle this themselves. Any more, most clients can use the full gamut of 5Ghz channels. As we approach the actual usage of wider channel widths, we should let the choice to use DFS be a decision based on RF coverage overlap and RF spectrum your deployment needs. Here's a fun IEEE whitepaper on DFS and the metrics used by WAPs to detect radar usage in their proximity: https://urldefense.proofpoint.com/v2/url?u=https-3A__mentor.ieee.org_802.11_dcn_09_11-2D09-2D1217-2D00-2D0reg-2Ddfs-2Dcriteria-2Dwhitep&d=DwICAg&c=2GaipCMI-4CXTl0y2l8grQS3faC7QKiDQZYpyUtD00M&r=uvxIRDMxwssmr2VjVNRe6I_MeNT0SmtowN9dpqcMAFc&m=UJSRL3de-xKEZ3evbS2KxX-6STZ7YmpW78P9wuJ6ZnY&s=6ijf3mR1buxRTxjP6m46SMZctwmx5FjwBMAm_eb5JO4&e= aper.pdf Thanks, Chris Adams, CISSP Director, Network & Telecom Services Division of Information Technology University of North Georgia E-Mail: chris.ad...@ung.edu | Office: (706) 867-2891 ====================================================================== CONFIDENTIALITY NOTICE: The information contained in this message may be privileged and confidential. If this e-mail contains protected health information, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited, except as permitted by law. If you have received this communication in error, please notify the sender immediately by replying to this message and deleting it from your computer. Thank you ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/discuss.
