Path: utzoo!attcan!uunet!lll-winken!lll-tis!helios.ee.lbl.gov!pasteur!ucbvax!ucf.CSNET!goldfarb%hcx9 From: goldfarb%hcx9@ucf.CSNET ("Benjamin I. Goldfarb") Newsgroups: comp.protocols.misc Subject: Re: About Protocols for File Transfer Message-ID: <8806061401.AA04016@hcx9.ucf.edu> Date: 6 Jun 88 14:01:35 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 20 >There isn't much of an upper bound on the number of extra >characters that might be inserted into the stream. Would you >believe several hours' worth of "UUUUUUUUUUUUUUUU" at 1200 >bps? (I enhanced error recovery procedures after that one.) >That's one modem's rendition of dial tone. ------ --- ------- --------- -- ---- ---- OH YEAH? More likely the "UUUUUUUUUUU" was an erroneously initiated test mode in the modem in question. Racal-Vadics are notorious for this but the feature can be disabled by either a dip switch or a strap option. A stream of ASCII U's makes for a good digital test because U is 01010101, so a stream of them creates a nice, big, fat square wave on a scope. Sorry to be so picky, but I never saw a modem "render" a dial tone. Ben Goldfarb University of Central Florida goldfarb@ucf-cs.ucf.edu {decvax,peora,uflorida,codas}!ucf-cs!goldfarb