Randy, The 5 GHz equipment approval process is currently on hold at the request of the FAA and the NTIA. Airport Terminal Doppler Weather Radars (TDWR) operate in the 5.6 GHz range and have been experiencing interference from current 5475-5725 MHz equipment. Because of this interference, a new Dynamic Frequency Selection (DFS) algorithm is being developed to allow newly-certified equipment to detect and avoid nearby TDWR radar systems. Until the new algorithm is developed and the FCC certification process re-started, there will be no new outdoor 5.4 equipment certified.
To allow recertifications to restart before the new algorithm is developed and implemented, the wireless industry has been meeting with the FCC, FAA and NTIA. The FAA and NTIA agreed to allow 5 GHz outdoor equipment certifications to be restarted if the industry would provide a database that allowed an operator to a) See if their outdoor base stations are within 35 km of one of the airport TDWR sites, and b) If within 35 km, voluntarily register their equipment type and contact information in the database. Each airport TDWR site uses one frequency. Operators are requested to maintain a minimum 30-MHz center-to-center frequency separation away from the single frequency used by the neighboring TDWR. If/when TDWR interference does occurs, the voluntary database should help the FCC to contact the operator of the equipment that may be causing the interference and request a frequency change or request that the one nearby TDWR frequency be excluded from the DFS channel search list. Once the new TDWR-aware algorithm is ready for incorporation into new 5 GHz equipment, this database is expected to slowly become obsolete as the older equipment is retired. WISPA's FCC Committee is working with the industry group (Motorola, Cisco, Atheros, Intel, etc.) as well as with the FCC, FAA and NTIA to help find a solution to this TDWR-interference problem. We'll provide more information when significant developments occur. Jack Unger WISPA FCC Committee Chair 818-227-4220 Randy Cosby wrote: > I'm trying to compile a list of options for FCC certified 5.4 ptp radios > for short backhaul links. Off the top of my head, I can remember: > > Tranzeo TR-5A > Trango TrangoLINK-45 > Radwin 2000 (has mimo as well) > Motorola PTP 100, 200, 300, 500, 600 > > Any others I'm not aware of? Sure would be nice to see more mimo/N > radios certified in 5.4. Anyone working through the approval process > (ligowave?). > > > -- Jack Unger - President, Ask-Wi.Com, Inc. Network Design - Technical Training - Technical Writing Serving the Broadband Wireless, Networking and Telecom Communities since 1993 www.ask-wi.com 818-227-4220 [email protected] -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
