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Catalyst 6500 and UPS caveat (ferroresonant technology)

Unanswered Question
Jun 6th, 2003
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The Catalyst 6500 pre-installation document has the following note:


In some systems, you may use an uninterruptible power supply (UPS)

to protect against power failures at your site. Avoid UPS types

that useIn some systems, you may use an uninterruptible power supply (UPS)

to protect against power failures at your site. Avoid UPS types

that use ferroresonant technology. These UPS types can become

unstable with systems like the Catalyst 6500 series switches,

which can have substantial current draw fluctuations due to

fluctuating data traffic patterns. . These UPS types can become

unstable with systems like the Catalyst 6500 series switches,

which can have substantial current draw fluctuations due to

fluctuating data traffic patterns.


all our UPS systems use this technology. what can we do?


Any comments, suggestions?


we recently ordered two 6509 with Sup720 and one 6506 with Sup-II.


thanks..

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raymong Mon, 06/09/2003 - 03:54
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I would suggest that you not try conecting your CIsco products with any UPS systems that uses ferroresonant technology. Not sure what options you have if all your UPS systems use this technology... I know the Cisco RPS 300 would work.

Asbjoern Hoejmark Mon, 06/09/2003 - 13:46
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First, the RPS 300 is not an UPS, it's merely a redundant power supply.


Second, the RPS 300 doesn't work with the C6K that eperez is asking about.


Third, the RPS 300 is announced end-of-life/end-of-sales.


-A

scottmac Tue, 06/10/2003 - 08:14
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Perhaps a "Line Conditioner" in between may work. Give OneAc a call and talk it over with their Technical Support.


If you decide to try a Line Conditioner, have someone check the power waveform with an Ocilliscope; having that much inductance on the line may somewhat mutilate the power.


Good Luck


Scott


Replace the UPS. The ferroresonant UPS's are old and obsolete (IMHO). Probably the most common ferroresonant are Best, APC, and Chloride. The reason they are common is because they are cheap. If you are protecting something like the 6509 with a cheap UPS, you must be crazed. Contact your local rep for either MGE, Powerware, or Liebert for a modern UPS that will eventually save you more money than you spend on it. UPS's today are up to 97% efficient and worth the investment. (Stay away from MGE Comet series)

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