Provide each power supply with an AC-input power source, since redundant power supply input sources must be the same type. To prevent a loss of input power, be sure the total maximum load on each AC circuit supplying the power supplies is within the current ratings of the wiring and breakers. Use care when connecting the switch to the supply circuit so that wiring is not overloaded. If a UPS is used, avoid types that use ferroresonant technology. A UPS that uses ferroresonant technology can become unstable when used on systems such as the Catalyst 2926 and Catalyst 2926G series switches, which can have substantial current draw fluctuations due to bursty data-traffic patterns.
G series switches.
Connect the redundant power supplies to separate input power lines to provide uninterrupted power in case one power supply or input power line fails. Warning Read the installation instructions before you connect the system to its power source. Warning This unit might have more than one power cord. To reduce the risk of electric shock, disconnect the two power supply cords before servicing the unit. This equipment is intended to be grounded.