lockrey%36975%essdp2%garfld.span@SDS.SDSC.EDU (07/22/87)
Network Wizards: Lately we have been having a rash of 'Line Synchronization Errors' on the uVAXen connected to our multi-segment ethernet. This problem does not seem to be confined to just one segment. And it does not seem to affect our Clusters (78X & 8XXX machines) which are also on the ethernet, but on their own segment. Since we use uVAXen as PC file servers, it's a real pain because every PC on the net is dropped when the Line Sync Errors happen. Does anybody know what a Line Sync Error means in the Ethernet domain? Does it have anything to do with the heartbeat? Local DEC installed some patches to the uVAX which didn't help a bit. Can this kind of problem be caused by electrical noise getting into Ethernet? A bad Bridge / Repeater. It has not always happened. Are there tools to locate the cause of these Errors? Ethernim does not help in this cases. Any and all help greatly appreciated. Brian Lockrey Battelle Columbus Labs ARPAnet: lockrey%36975%essdp2.span@Sdsc-Sds.Arpa BITnet: LOCKREYB@UWARITA CompuServe: [76117,563] AT&T: 614-424-7281
SYSRUTH@UTORPHYS.BITNET (07/29/87)
What were the "patches" that Field Service installed on your uVAXes? Were they hardware or software? You should check that your DEQNA's are *at least* Rev. E, preferably higher. This is an old ECO, though (over a year). If you got your DEQNA's more recently than, say, April of last year, this should not be a problem. We had some problems with ours that sound similar; 2 receive errors, then a line sync. error, then a circuit up message, a 1-minute-or-so pause, and the same thing again. This is definitely a known problem, and Rev. E or higher is required for LAVC's because of this. Ruth Milner Systems Manager University of Toronto Physics SYSRUTH@UTORPHYS (BITNET) P.S. It is of course still possible that your problems are caused by something else, but this might help eliminate something.