The FCC has handed over specification and testing of terminal equipment to an outside body. Going back a few years, though, you'll find the on-hook requirements in part 68. See http://www.hallikainen.com/FccRules/2000/68/312/ In general, for DC, the on-hook resistance must be greater than 5M ohms for all DC voltages up to 100V. Current specifications for telephone interface are available at http://www.part68.org/documents.cfm Harold FCC Rules Online at http://www.hallikainen.com ________________________________________________________________ The best thing to hit the internet in years - Juno SpeedBand! Surf the web up to FIVE TIMES FASTER! Only $14.95/ month - visit www.juno.com to sign up today! -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body