thoth@tellab2.UUCP (Marcus Hall) (03/20/85)
I am having problems with out uucp link to ihnp4. Every now and then, for no reason that I know of, ihnp4 will start sending out 'UUUUUUUUUUUUUUU...'. The connection will not time out, and both uucps are happy to sit there for hours on end like this. We call three other sites and haven't ever experienced problems with them, so I think that our uucp is okay, but I can't imagine that ihnp4 has bad uucp problems! After breaking the connection, things seem to go on as normal, but this failure has been happening more and more often recently. Has anyone else seen this problem before? If so, HELP!! (please). As always, thanks in advance. marcus hall ..!ihnp4!tellab1!tellab2!thoth
ecl@ahutb.UUCP (e.c.leeper) (03/21/85)
REFERENCES: <229@tellab2.UUCP>
For what it's worth, I see the "UUUUUUUUUUUUUUUU..." problem on my terminal
when dialing up from home. There's nothing to do but hang up and re-dial.
I suspect it's some funny glitch on the line in both cases.
Evelyn C. Leeper
Note temporary kluge for new address => ...{ihnp4, houxm, hocsj}!ahuta!ahutb!eclres@ihuxn.UUCP (Rich Strebendt) (03/21/85)
In reply to: > I am having problems with out uucp link to ihnp4. Every now and then, for > no reason that I know of, ihnp4 will start sending out 'UUUUUUUUUUUUUUU...'. > The connection will not time out, and both uucps are happy to sit there for > hours on end like this. We call three other sites and haven't ever experienced > problems with them, so I think that our uucp is okay, but I can't imagine that > ihnp4 has bad uucp problems! > > Has anyone else seen this problem before? If so, HELP!! (please). AHHHHHH, the infamous digital loopback problem strikes again !! The problem is that one or both of the modems involved in the connection have the option for the digital loop-back test enabled (as it is set up at the factory). This is option YK on my Penril 300/1200 modem (internal dip switch S2-7). Set your modem up to option YL (throw the dip switch the other way) and yell and scream and holler at the comp center administrators to fix ALL of their modems properly. Also expect as new modems are installed and old ones come back from repair that the situation will gradually degenerate until you find it necessary to yell and scream and holler once more. Why, you may ask, does this show up as an eternal stream of U's? It just so happens that the ASCII code for 'U' is 0x55 or, in binary, 01010101 -- the square wave used for the digital loop test. And how, you ask again, does the link get into this state? Just a bit of noise on the line that the modem decides looks like a request to enter this state. Perhaps this question and answer should be added to the new-netter set of questions. It is one of those things likely to bite each of us someday and is very mysterious until the explanation is obtained. Rich Strebendt ...!ihnp4!ihuxn!res
honey@down.FUN (03/21/85)
someone has a modem with remote diagnostics enabled. turn it off. peter
lauren@vortex.UUCP (Lauren Weinstein) (03/22/85)
The UUUUUUUUUUUUUUU sequence is usually a symptom of 212 modems entering their self-test mode. Once this happens (it is a modem problem, not a uucp problem) it can put the connection into a state from which normal recovery can be very difficult. It is always best to set the switches on your modems to DISABLE "remote self test" to avoid exactly this sort of problem. --Lauren--