Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site ecsvax.UUCP Path: utzoo!linus!philabs!prls!amdimage!amdcad!decwrl!decvax!mcnc!ecsvax!hes From: hes@ecsvax.UUCP (Henry Schaffer) Newsgroups: net.dcom Subject: Re: Re: Need surge protectors for phone line Message-ID: <125@ecsvax.UUCP> Date: Tue, 6-Aug-85 22:19:14 EDT Article-I.D.: ecsvax.125 Posted: Tue Aug 6 22:19:14 1985 Date-Received: Sun, 11-Aug-85 04:05:44 EDT References: <545@wdl1.UUCP> <228@kitty.UUCP> Organization: NC State Univ. Lines: 13 > > Remember Data Access Arrangements? Those boxes the phone company > > used to make you buy to ``protect the telephone system''? > Now all of these functions have been > replaced with solid-state optocouplers which are still much more vulnerable > to damage that the old relay counterparts. > > Larry Lippman An auto answer modem we've used has a full-wave bridge rectifier across the line. I think it's used to detect the ringing voltage, and probably also to make ring-tip reversals make no difference. The problem is that it tends to get blown during lightning weather. --henry schaffer