Thread View: comp.dcom.sys.cisco
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Started by James_W._Morrison.ESAE
Thu, 05 Jul 1990 21:41
Re: strange behaviour involving repeaters
Author: James_W._Morrison.ESAE
Date: Thu, 05 Jul 1990 21:41
Date: Thu, 05 Jul 1990 21:41
30 lines
1643 bytes
1643 bytes
Greg; Try changing the tranceivers on on either side of the repeater one at a time. Sometimes tranceivers will break packets when heavily loaded with traffic (especially if they go flacky and not totally break). If the tranceivers don't fix the problem then the repeater has to be breaking packets either because it can't handle the traffic load or it's flacky. If all else fails hook an o-scope up to the ethernet using a "T" adapter in series with the terminated end and look for broken packets (packets with an amplitude of more than -2 volts). The broken packets may all be mangled or only a portion of the packet near the end. Disconnect the reapeater and see if the broken packet condition still exists. If so you have a machine or tranceiver somewhere on that physical segment that's flacky/broken. Using the buddy system go and disconnect each machine on taht segment one at a time until you find the mangler. Walla fix this guy and all will be well. The reason this causes problems on both sides of the repeater is that it looks like an open and repeaters only pass what they see and don't try to "qualify" any packet, good or broken. hope this helps, Jim Morrison Network Systems Analyst Xerox Corp. El Segundo, CA.
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