MX80 Power System Description
The MX80 router uses either AC or DC power supplies (see Figure 1 and Figure 2). The router contains either one or two power supplies located at the front of the chassis in slots PS0 and PS1 (right to left). Each power supply has a handle, an ejection lever, a power switch, and a status LED. The power supplies connect to the base board, which distributes the different output voltages produced by the power supplies to the router components, depending on their voltage requirements. When two power supplies are present, they share power almost equally within a fully populated system. If one power supply in a redundant configuration fails or is removed, the remaining power supply assumes the entire electrical load without interruption. A single power supply provides the maximum configuration with full power for as long as the router is operational. A second power supply can be installed for redundancy. Each power supply is cooled by its own internal cooling system.
Redundant power supplies are hot-removable and hot-insertable. When you remove a power supply from a router that uses only one power supply, the router might shut down depending on your configuration.
 | Caution: The router cannot be powered from AC and DC power supplies simultaneously. |
 | Note: Routers configured with only one power supply are shipped with a blank panel installed over the power supply slot that is not populated. |
Figure 1: AC Power Supplies Installed in an MX80 Router
Figure 2: DC Power Supplies Installed in an MX80 Router
MX80 AC Power Supply Description
Each AC power supply weighs approximately 2.6 lb (1.18 kg) and consists of a handle, an ejection lever, an AC appliance inlet, an AC input switch, a fan, and an LED to monitor the status of the power supply. Figure 3 shows the power supply.
Each inlet requires a dedicated AC power feed and a dedicated customer site circuit breaker. We recommend that you use a minimum 15 A (110 VAC) customer site circuit breaker, or as required by local code.
Figure 3: AC Power Supply
 | Warning: The router is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for SAE 10-32 ground screws) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth. |
MX80 DC Power Supply Description
Each DC power supply has a handle, an ejection lever, a power switch, a status LED, and a terminal block that provides a single DC input (–48 VDC and return) that requires a dedicated customer site circuit breaker. We recommend that you use a dedicated customer site circuit breaker rated for 25 A (–48 VDC) minimum, or as required by local code. Figure 4 shows the power supply.
Figure 4: DC Power Supply
