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Connecting DC Power to a TCX1000-RDM20


DC-powered TCX1000-RDM20 models are intended for installation only in a restricted access location.

Before you begin connecting DC power to the TCX1000-RDM20:

  • Read General Electrical Safety Guidelines and Warnings and TCX1000-RDM20 DC Power Electrical Safety Guidelines in the TCX1000 Programmable ROADM Hardware Guide.

  • Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage in the TCX1000 Programmable ROADM Hardware Guide).

  • Ensure that you have connected the TCX1000-RDM20 chassis to earth ground.


    Before you connect power to the TCX1000-RDM20, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the ROADM (for example, by causing a short circuit).


    To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, you must connect the chassis to earth ground before you connect it to power. For installations that require a separate grounding conductor to the chassis, use the protective earthing terminal on the TCX1000-RDM20 chassis to connect to the earth ground (see Connecting the TCX1000-RDM20 Grounding Cable in the TCX1000 Programmable ROADM Hardware Guide).


    You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (–) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminals on each power supply.

  • Ensure that you have the following parts and tools available:

    • ESD grounding strap.

    • Power cable or cables appropriate for your geographical location available to connect DC power to the TCX1000-RDM20.


Each power supply must be connected to a dedicated power source outlet. We recommend connecting each power supply to a different power source for redundancy purposes.

To connect DC power to a TCX1000-RDM20:

  1. Prevent ESD damage to your equipment by attaching an ESD grounding strap to your bare wrist, and then connecting the strap to an approved site ESD grounding point.
  2. Ensure that the power supplies are fully inserted in the chassis and the latches are secure.
  3. Ensure that the power source is turned off, the voltage across the DC power source cable leads is 0 V, and there is no chance that the cable leads might become active during installation.
  4. Remove the plastic cover from the terminal block on the power supply. Remove the terminal block screws.
  5. Identify the positive and negative feed positions, as marked on the power supply.
  6. Strip each of the wires coming out from the DC-input power source by 8-9 mm. Do not strip more than required, because doing so can leave the wire exposed from the DC connector after installation. The cable must be terminated with the supplied ring lug (Panduit PN14-8R-C).
  7. Insert the lug into the terminal block. See Figure 1.
    Figure 1: Attaching the Lug and Cable
    Attaching the Lug and Cable
  8. Use a ratcheting torque screwdriver to apply a torque of 1.53 nm to each of the terminal block screws. See Figure 1.
  9. Use a tie-wrap to secures the cables. See Figure 2.
    Figure 2: Connecting the DC Power
    Connecting the DC Power
  10. Repeat Step 4 through Step 9 for each power supply you are connecting to power.Warning

    Ensure that the power cables do not block access to device components or drape where people can trip on them.

  11. Replace the plastic cover.
  12. Close the input circuit breaker.Note

    We recommend that the 48-VDC facility DC source be equipped with a circuit protector rated as required by local code. For the voltage range, see the TCX1000 Programmable ROADM Hardware Guide at


    The TCX1000-RDM20 powers on as soon you connect the power.

  13. Verify that the LEDs on each power supply are lit green.

    If the LEDs are lit yellow, remove power from the power supply, and replace the power supply (see Removing a Power Supply from a TCX1000-RDM20 in the TCX1000 Programmable ROADM Hardware Guide). Do not remove the power supply until you have a replacement power supply ready; the power supplies must be installed in the TCX1000-RDM20 to ensure proper airflow.


    Replace a failed power supply with a new power supply within five minutes of removal to prevent chassis overheating.