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Hi everybody, Wonder if anybody has experienced this kind of thing: In the last few months we recently had a company upgrade part of our aging HUB controlled cat5e network with cat 6 switches. We now use gigabit to the desktop which is great. All seemed ok for a bit... Then we had some segments starting to lose some ports! This required resetting the switch in that area. This resolved the issue temporarily. Since that time all sorts of areas have been affected. We thought maybe some power fluctuations could affect the switches and indeed we have data via PowerChute which goes some way to confirm this so we have protected the most troublesome areas with SmartUPS units. However, this to our surprise has had little or no effect! We regularly on almost a daily basis now have 3 key areas which exhibit this issue and randomly others. We have a large network over a very spread out campus with many fibre segments going back to two central fibre switches! We have had the network installers back to check for storming switches and transceivers etc and they apparently did find an issue although reluctant to share this with us at the time of discovery. Even with all this the issue still exists and is inconveniencing many staff and making the situation difficult for us in IT Support as we have: 1. Checked the network for storming switches and hubs ourselves (A massive undertaking) 2. Checked for damaged cables 3. Checked for damaged network cards 4. Checked for damaged storming WAPS, min switches etc. The only thing we have identified is that the new MAIN switch in question an AT 9924SP seems to fluctuate very quickly indeed and is the main fibre core switch that the company installed along with a number of new AT switches (copper) around the campus. The existing MAIN switch which is identical we had before did not exhibit this behaviour. Only since the other switch has been installed does the whole lot exhibit this manic behaviour. And another thing, we have to reset the remote segments first thing in the morning! Why is this? We are considering purchasing a spare AT 9924SP switch (Not cheap) and changing it out to test the idea that the new core switch may be at fault so.... The upshot of all this is: Our network seems less reliable since we have upgraded to full Gigabit, the company responsible for the upgrade has already attended, corrected an issue and felt nothing else was wrong even though they accepted that the switch seemed overly busy, we have checked the other switches around the campus, all computers and printers and other devices for errors and as much cabling as we can and found nothing obvious except the main (apparently chattering) main switch. So the questions are: 1. Has anybody else experienced this kind of thing, if so, what was the resolution? 2. Has anybody else had experience with this switch AT 9924SP and modules ATSPSX, mini gbics? What do think of Allied Telesis switches? 3. Does Power have an effect on switched networks in your experience in relation to brown outs and spikes? Do you need to UPS protect the switches for this issue and in which case even though they are smartUPS and protect against spikes and surges and over charge under charge why do they appear to not have an effect? Many thanks and apologies for the long post. I appreciate any comments and answers.