Justin Shore wrote: > [email protected] wrote: >> I'm getting ready to install some RPS 675's in order to dual cord some >> 3750's and ran across this in the manual: >> >> "Do not use different power sources to power up the RPS and the connected >> device. If you connect to separate AC power sources, reset conditions >> might >> occur." >> >> Huh? My intent is to plug the RPS into a different PDU than the actual >> switches so that the switches can stay online in the event of a power >> failure on their primary circuit. Is this Cisco FUD or are there good >> reasons I wouldn't want to plug an RPS into a different circuit than the >> connected switches? > > The only possible problem that I can foresee is the potential to create > a ground loop. That wouldn't be good. The RPSs are only meant to > protect against a power supply failure, not a power source failure. > > That said, I use a RPS 675 in the same way that you're describing > without any problems. > > Also, remember that the RPS 675 can only keep 1 connected device powered > up in the event of a power failure. The RPS 2300 can do 2. Ie, if you > have a stack of 4 switches with 2 connected to circuit A, 2 connected to > circuit B, the RPS connected to circuit C (with all 4 switches connected > to that RPS) and circuit B fails, only 1 of the 2 switches connected to > circuit B will get power from the RPS. The other will be dead in the > water. >
Don't forget rebooting to go back to internal power. Except on 2088 series routers with an AC-IP power supply; they can switch back fine. ~Seth _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
