sherman%vsdec.decnet@NUSC.NAVY.MIL ("VSDEC::SHERMAN") (11/11/90)
Hi. I've had/seen an intermittent problem over the last 8 years, and I have yet to bump into anybody who can explain why I see this problem, or what it is. I'll be connected to some computer via modem doing my normal work when suddenly I'll get about 60 uppercase Us on my screen. From then on, everything I type gets echoed on my CRT but I get no responses back from the computer that I'm connected to. I've tried typing commands that would effect things on the computer that I'm dialed up to so that when I sign back on again I could tell if it was seeing what I typed, but the commands were never acted upon. But the modem is still off-hook and got a carrier- detect. I've seen the mysterious UUUUUUUs using different terminals and terminal emulators, when using different modems, when dialed up not only to different computers, but also different sites across the country. Does anybody there know what this is? I only happens perhaps 3 or 4 times a year, but it's always very annoying and extremely puzzling. Bill
bzs@world.std.com (Barry Shein) (11/12/90)
In ASCII "U" is hex 55 or, in binary, your message is 01010101010101010101
Perhaps that's a clue.
--
-Barry Shein
Software Tool & Die | {xylogics,uunet}!world!bzs | bzs@world.std.com
Purveyors to the Trade | Voice: 617-739-0202 | Login: 617-739-WRLDpaul@uxc.cso.uiuc.edu (Paul Pomes - UofIllinois CSO) (11/12/90)
sherman%vsdec.decnet@NUSC.NAVY.MIL ("VSDEC::SHERMAN") writes: >Hi. > >I've had/seen an intermittent problem over the last 8 years, and >I have yet to bump into anybody who can explain why I see this >problem, or what it is. > >I'll be connected to some computer via modem doing my normal work >when suddenly I'll get about 60 uppercase Us on my screen. From >then on, everything I type gets echoed on my CRT but I get no >responses back from the computer that I'm connected to. Some line noise is triggering the remote modem to go into a test mode and/or loopback. Upper case 'U' characters have an alternating 1-0 bit pattern useful for testing BER, etc. The fix is to disable remote toggling of test mode. /pbp -- Paul Pomes UUCP: {att,iuvax,uunet}!uiucuxc!paul Internet, BITNET: paul@uxc.cso.uiuc.edu US Mail: UofIllinois, CSO, 1304 W Springfield Ave, Urbana, IL 61801-2910
ab4@cunixb.cc.columbia.edu (Andrew M. Boardman) (11/12/90)
There was a an exhaustive discussion of this a while ago, in, I believe, comp.dcom.telecom. I seem to remember that this was caused by modems trying to resync -- they would send alternating 1's and 0's until they got back on speaking terms. /a