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M40 Router Power Supplies
The M40 router can use either AC or DC power. Two load-sharing power supplies install into the bays located at the bottom rear of the chassis. As viewed from the rear of the chassis, the supply on the left is referred to as supply A and the supply on the right as supply B. Figure 1 shows the M40 router power supplies and where they are installed in the chassis.
The power supplies are fully redundant. When both power supplies are operational, they automatically share the electrical load. If one power supply stops functioning for any reason, the remaining power supply instantly begins providing all the power the router needs for normal functioning, and can provide full power indefinitely.
Figure 1: M40 Router Power Supplies
