Hello Joe, In reply to your TREG message of May 14 regarding lightning incidence in Japan and any protection requirements on telecom equipment, here are several resources that you might find helpful.
The Colorado Lightning Research Center focuses mostly on lightning in the U.S.A., but their Web site shows a map of lightning incidence worldwide. This map shows Japan as having lightning incidence of around 8-20 flashes/sq km/year (if I am interpreting their map correctly), which is similar to the midwestern U.S.A. or southern Canada. See: http://www.crh.noaa.gov/pub/ltg.html The National Lightning Safety Institute also has a map showing lightning strike regions in Japan, with data on the average number of thunderstorms per year at: http://www.lightningsafety.com/nlsi_info/lightningmaps/JPNghtning.html You might also check out the Web site of the Society of Atmospheric Electricity of Japan at: http://lightning.pwr.eng.osaka-u.ac.jp/saej/e_index.html NTT (Japan) standardization activities are discussed in their "NTT Review" periodical. It seems to me that this might be a place where research on lightning effects on telecom equipment in Japan might be reported. The NTT Review is available on the web at: http://www.ntt.co.jp/RD/Enindex.html Hope you find these helpful. Best regards, -- Scott Roleson --------------------------------------------------------------------- Scott Roleson, PE (MS-61U74) | E-mail: srole...@ieee.org Telecom & EMC Engineer | http://www.roleson.com Corporate External Standards | Telephone: +1-858-655-4809 Hewlett-Packard Company | FAX: +1-858-655-5931 16399 W. Bernardo Drive | Amateur Radio: KC7CJ San Diego, CA 92127-1899 USA | Any opinions are my own, not HP's. ---------------------------------------------------------------------
