MX240 Ethernet Services Router Hardware Guide
and PEM2 (left to right). You can upgrade your DC power system from one to two power supplies. A single DC power supply provides power to all components.
One DC power supply is required. A second DC power supply provides redundancy. If a DC power supply in a redundant configuration fails, the redundant power supply takes over without interruption.
DC Power Supply LEDs
Each DC power supply faceplate contains three LEDs that indicate the status of the power supply (see Table 18 on page 24). The power supply status is also reflected in two LEDs on the craft interface (see Table 13 on page 19). In addition, a power supply failure triggers the red alarm LED on the craft interface.
NOTE: An SCB must be present for the PWR OK LED to go on.
Table 18: DC Power Supply LEDs
Label | Color | State | Description |
PWR OK | Green | Off | Power supply is not functioning normally. Check the INPUT OK LED for more |
|
|
| information. |
|
| On | Power supply is functioning normally. |
| Amber | On | The main output voltage is out of range (lower limit: 37.5 V to 39.5 V; upper limit: |
|
|
| 72.5 V to 76 V). |
BRKR ON | Green | Off | DC power supply circuit breaker is turned off. |
| Green | On | DC power input is present and the DC power supply circuit breaker is turned on. |
INPUT OK | Green | Off | DC input to the PEM is not present. |
|
| On | DC input is present and is connected in correct polarity. |
| Amber | On | DC input is present, but not in valid operating range or connected in reverse |
|
|
| polarity. |
Cooling System
The cooling system consists of the following components:
■Fan tray
■Air filter
The cooling system components work together to keep all router components within the acceptable temperature range (see Figure 17 on page 25, Figure 18 on page 25, and Figure 19 on page 26). The router has one fan tray and one air filter that install vertically in the rear of the router. The fan tray contains three fans.
24■ Cooling System
