APC's Rack Automatic Transfer
Switch (ATS), also known as the Redundant
Switch, is a high availability switch that
has two input power cords, one for each AC
line, which provide redundant power to
connected equipment. The Rack ATS is designed
to supply power to the connected load from a
primary AC source. If that primary source
becomes unavailable for whatever reason, the
Rack ATS will automatically begin sourcing
power from the secondary source. The transfer
time from one source to the other is seamless
to the connected equipment. The Networked
units have built-in network connectivity,
which allows for remote management via Web,
SNMP, or Telnet interfaces.