Replacing a Remote Unit

Context

A remote unit is severely damaged or a hardware fault occurs due to external forces.

• Power off the remote unit before replacing it, which will interrupt services.
• Do not remove the remote unit immediately after it is powered off. Instead, remove the remote unit after it cools down completely. When removing the remote unit, touch the plastic part on the front of the remote unit and do not touch the metal part on the rear of the remote unit. Otherwise, your fingers may be burned.

Tools and Accessories

• ESD wrist strap or ESD gloves
• Phillips screwdriver

Procedure

1. Wear an ESD wrist strap or ESD gloves. If you wear an ESD wrist strap, ensure that one end of the ESD wrist strap is grounded and the other end is in close contact with your wrist.
2. Ensure that the names, models, and specifications of the new and original remote units are the same. If a mismatch is found, contact technical support as soon as possible.
3. Record the IDs of slots where different modules are installed and cable connections on ports of the original remote unit.
4. Power off the original remote unit.

   The remote unit is successfully powered off when all indicators are off.

5. Replace the remote unit.
   • If the remote unit is installed on a rapid duct:
     1. Remove the cover plate to reserve sufficient space for operations, and then remove the decorative panel.
     2. Remove the remote unit from the duct slot.
     3. Remove all cables and pluggable modules from the remote unit. (You also need to remove the mechanical part if the remote unit is installed on a rapid OBO80 duct.)
     4. Install the new remote unit in the original position.
   • If the remote unit is installed on a workbench or wall:
     1. Remove all cables and pluggable modules from the remote unit.
     2. Remove the remote unit from the wall-mounting screws. (Skip this step if the remote unit is installed on a workbench.)

        During the replacement, hold the bottom of the remote unit with your hands to prevent it from falling down, which may cause personal injury or damage to other devices.

     3. Install the new remote unit in the original position.
6. Install the original modules and cables according to the recorded information.
7. Power on the remote unit and observe the SYS indicator. Normally, the SYS indicator on the remote unit is steady green.
8. Log in to the central switch and check whether the new remote unit is working properly.
   1. Run the display remote-unit connect record command to check the logout record of the original remote unit and login record of the new remote unit.
   2. Run the display remote-unit command to check the remote unit information. In the command output, the ESN field displays the ESN of the new remote unit, and entries of the original remote unit have been deleted.

Follow-up Procedure

If the new remote unit cannot work normally, contact the equipment supplier or local maintenance personnel to obtain technical support.

After the replacement is complete, collect all tools. When you confirm that the replaced remote unit is faulty, fill in the Repair Transmission Sheet and send the faulty remote unit and the sheet to the equipment supplier or the specified repair service provider.