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S12700 and S12700E Series Agile Switches Hardware Installation and Component Replacement

This document describes hardware installation procedures of the S12700 series switches, troubleshooting methods for common hardware faults, and switch maintenance instructions.

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Replacing a Service Card

Replacing a Service Card


Replace a card if the card fails or the equipment needs a hardware upgrade.

Before replacing a card, verify that the available power is sufficient for the new card using the display power system command. If the available power (The remain power in the command output) is smaller than the power of the new card minus the power of the old card, use power modules with higher power to replace the original ones. Otherwise, the card will fail to be powered on. It is recommended that you use the Hardware Configuration Tool to calculate the total power consumption of the switch.


  • ESD wrist strap or ESD gloves
  • Tweezers (delivered with the switch)
  • Phillips screwdriver


  1. Wear an ESD wrist strap or a pair of ESD gloves. When wearing an ESD wrist strap, insert the other end in the ESD jack of a device and ensure that the device is reliably grounded.
  2. Select a spare card of the same type as the old card. If the spare card is different from the old one, ensure that it can replace the old card. Make sure that no components on the new card are damaged or missing. Record the bar code on the new card, which will be used for future repair service.
  3. Record the cable locations on the old card and check whether the labels on the cables are correct and legible. If any labels are illegible, make and attach new labels to the cables to ensure correct cable connection on the new card.
  4. Remove cables from the old card.

    • To remove a cable, release the handle or locking clips on the cable connector, gently push the cable connector by holding the handle or locking clips, and then unplug the cable.

    • If many cables are connected to a card, use the tweezers delivered with the switch to remove the cables.

  5. Remove the card.
    1. Rotate the ejector levers outward to release the card from the backplane. See callout 1 in Figure 13-8.

      If the card to be replaced is secured in the slot with captive screws, loosen the captive screws first.

    2. Grasp the ejector levers and pull out the card slowly along with the guide rails. See callout 2 in Figure 13-8.

      Pull the card along the guide rails in the slot. Otherwise, the card may collide with components on adjacent cards, causing damage to the components.

      The methods for replacing different types of cards are the same. This section uses a Line Processing Unit (LPU) as an example.

      Figure 13-8 Removing a card

  6. Install the spare card. For details, see Installing a Card.
  7. Install optical modules or network cables in accordance with the recorded connections. See Connecting Ethernet Cables, Connecting High-Speed Cables, or Installing Optical Modules and Connecting Optical Fibers.
  8. Observe the RUN/ALM indicator on the new card.

    It takes less than 5 minutes for the card to start and register.
    • If the RUN/ALM indicator blinks green fast, the card is starting.
    • If the RUN/ALM indicator blinks green slowly, the card is running normally.

  9. Verify the functions of the new card.

    After installing a new card, check whether the card is functioning normally:

    • If the RUN/ALM indicator is steady red, the card is functioning abnormally.

    • Run the display device command to check the running status of the new card.

Follow-up Procedure

After replacing the service card, collect all tools. If the replaced service card is faulty, fill in the Repair Transmission Sheet and send the faulty module with the Repair Transmission Sheet to the equipment supplier or the specified repair service provider.

Updated: 2020-02-18

Document ID: EDOC1000069460

Views: 47776

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