8-2 61200290L1-1GSection 8, Power Loss Recovery MX2800 M13 Multiplexer User ManualNOTEPower supplies are hot-swappable.3. POWER SUPPLY RECOVERY MODEIn Power Supply Recovery Mode, two power supply cards are installed and connected to a single powersource. See Figure 8-2. In this mode, the MX2800 continues operation in the event of a power supplyfailure without interrupting service. The power supplies are load sharing, so either power supply canprovide power for the entire unit.NOTEWhen the unit is configured with dual internal AC power supplies, this isthe only power supply protection mode available.Figure 8-2. Power Supply Failure Recovery Mode4. POWER SUPPLY AND SOURCE RECOVERY MODEIn this mode, two power supply cards are installed and are connected to two individual power sources. TheMX2800 handles any combination of power source or power supply failure.Much like the backup design for the controller cards, the MX2800 is able to internally re-route the powersource if a power supply card and the opposite power source fail. For example, in Figure 8-3 on page 8-3,failed Power Source A is connected to healthy Card A, and healthy Power Source B is connected to failedCard B. In a case like this, the MX2800 automatically connects Power Source B to Card A.NOTEThis configuration is available only with DC power supplies.MX2800
