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Installing MX2000 Router DC Power Supply Modules (-48 V)

To install an MX2000 DC PSM (-48 V):

  1. Verify that the power switches on all PSMs are in the off (O) position.
  2. On the PSM, slide the plastic cover away from the input mode switch to expose the dual DIP switches. Move the input mode DIP switch 0 (left switch) to the ON position for the bottom feed INP0 (expected to be connected), and DIP switch 1 (right switch) to the ON position for the top feed INP1 (expected to be connected). If both DIP switches 0 and 1 are turned to the ON position, then both top and bottom feeds are expected to be connected, (see Figure 1).

    In addition, a PSM failure triggers the alarm LED on the craft interface.

    Note:

    The DIP switches are only used to indicate presence of a feed. If both feeds are present, power is always drawn from feed 0. Power will be drawn from feed 1 only if feed 0 fails.

    Figure 1: Selecting DC Power Subsystem Feed RedundancySelecting DC Power Subsystem Feed Redundancy
  3. Using both hands, grasp the handle and slide the PSM straight into the chassis until the PSM is fully seated in the chassis slot. Tighten the two captive screws (see Figure 2 (MX2020) and Figure 3) (MX2010), or Figure 4 (MX2008). Apply between 10 lb-in. (1.13 Nm) to 12 lb-in. (1.35 Nm) of torque to each screw. Do not overtighten the screws.
    Figure 2: Installing an MX2020 Router DC Power Supply Module InstalledInstalling an MX2020 Router DC Power Supply Module Installed
    Figure 3: Installing an MX2010 Router DC Power Supply ModuleInstalling an MX2010 Router DC Power Supply Module
    Figure 4: Installing an MX2008 Router DC Power Supply Module Installing an MX2008 Router DC Power Supply Module
  4. Verify that the INP0 and/or INP1 LEDs on the PSM are lit green steadily (see Figure 5).
    Note:

    If you are connecting two feeds, INP0 and INP1, both LEDs on the PSM will be lit green steadily.

  5. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  6. Move the switch to the on (|) position.
  7. Verify that the PWR OK LED is lit green steadily. See MX2020 DC Power Supply Module LEDs, MX2010 DC Power Supply Module LEDs, or MX2008 DC Power Supply Module LEDs for information on PSM LED behavior.
  8. Repeat Steps 1 through 7 for installing PSMs in slots 0, 1, and 2, where required.
    Figure 5: MX2000 DC Power Supply Module Front ViewMX2000 DC Power Supply Module Front View
    Note:

    Each PSM slot not occupied by a DC PSM must be covered by a PSM blank panel.

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