The spec is actually ANSI/TIA/EIA-222-E-1996 Global Engineering Documents calls it: TIA/EIA-222-F I had the date wrong!! It's not 1997, it's 1996 Bill, N3RR -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com Search: http://www.contesting.com/km9p/search.htm