We've been seeing a strange problem on a network we operate that has a lot of (mostly old) Motorola PTP400 radios on it. These use the Motorola PIDU POE injector. They're connected to HP Procurve and Cisco 3550 switches.
The problem is that some radios literally kill the switch ports. Sometimes it begins with alignment and CRC errors on the switch ports. But then the port might fail, and the radio has to be plugged into another port... until it fails. It's an odd failure mode too; the 3550 thinks the port is OK, and sees it as going up and down as the PIDU is attached and detached, but it doesn't pass packets. The "fix" is to insert a small dumb switch to isolate the 3550 from the PTP, but that's kind of a nasty hack. Ciscos seem somewhat more susceptible than HPs, but we're migrating towards the venerable Ciscos because they are more manageable. We think we have the speed and duplex matching right. And while we can't be sure, the cabling in most cases looks okay. Anybody else run into this? Thanks. -- Fred R. Goldstein k1io fred "at" interisle.net Interisle Consulting Group +1 617 795 2701 _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless
