APC Rack PDU

The product information pages:

http://www.apcc.com/products/family/index.cfm?id=70

The User's Guide:

http://www.apcmedia.com/salestools/ASTE-6Z6KAV_R1_EN.pdf

Apparently, an existing http or telnet session will make the
plugin fail.

In case your nodes are equipped with multiple power supplies, the
PDU supports synchronous operation on multiple outlets on up to
four Switched Rack PDUs. See the User's Guide for more
information on how to setup outlet groups.

NB: There has been a report by one user that in case a link
between two PDUs in the chain is broken, the PDU returns success
even though it failed. This needs to be verified.