Maintenance and Field Replacement

This appendix describes the process for replacing switch components.

The following topics are covered in this section:

You must ensure that at least one of the secondary grounding pads located on the front panel of the chassis is connected to the data center ground. While working on the switches, use grounded, anti-static wrist straps connected to one of the attach points on the switch for grounding yourself and preventing ESD damage to the switch.

Note: Illustrations in this appendix are examples for a representative switch and component(s). Procedures must be applied to component(s) supported by the specific device. You must use component(s) and the appropriate slots for those component(s) when replacing or adding them.

 

Inspect the connectors for damage prior to installing components into the chassis.

Line Card and Supervisor Extraction Tools

Extraction tools are provided for removing and inserting line cards and supervisor modules into the chassis. Assemble and tether these to the chassis.

Note: Front Panel shows the locations for tethering and storing the extraction tools.

 

Assembling and Storing the Extraction Tools

The extraction tools come with a lanyard and tethering plug as shown in Figure 1.
Figure 1. Linecard and Supervisor Module Extraction Tool and Tether Assembly

Use the following steps to attach the tethering mechanism to the extraction tool.

  1. Extend and slip the lanyard thread through the slot in the plastic tether.
  2. Attach the ring to the extraction tool.
  3. Plug the plastic tether into one of the slots (Figure 1).
  4. Repeat for the other tools as appropriate.

Power Supplies

The switches support AC or DC Power supplies. The switches ship with a number of populated slots depending on the switch model. Empty slots are covered with a blank. For adding a new power supply in one of the available slots, remove the blank covering the slot before inserting a new power supply.The following steps are required for ESD protection when adding or replacing power supplies.
Note: Front Panel shows the locations of power supplies for your device.

 

  1. Connect at least one of the chassis grounding pads located on the front and rear panels of the chassis to the data center ground as needed to ensure that the switch is grounded.
  2. Put on an anti-static ESD wrist strap and connect it to one of the attach points on the switch.
  3. Remove the power supply to be replaced (Removing AC Power Supply, Removing DC Power Supply) or the blank for the slot (Removing Power Supply Blank) in which the new power supply is to be added.

Removing AC Power Supply

Perform the following steps to remove an AC power supply.
  1. Put on a grounded, anti-static ESD strap.
  2. Unplug the cable(s) by squeezing the cable release. Up to two cables could be powering each PSU.
  3. Squeeze the latch release.
  4. Remove the power supply from the switch using the power supply latch release and handle.

Installing AC Power Supply

You must make space for installing the power supply by removing an existing one (Removing AC Power Supply, Removing DC Power Supply) or removing a blank (Removing Power Supply Blank) from a power supply slot available on the switch.

Perform the following steps to install an AC power supply:

  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the new power supply.
  3. Insert the new power supply into the empty power supply slot.
  4. After you insert the power supply, push gently on the power supply until the power supply is fully seated.
  5. Connect the power cord(s) to the power supply. Up to two cables can power each PSU.
  6. Connect to the power source.
  7. Verify normal operation using the LED indicators for your switch Table 5.

Removing DC Power Supply

  • Ensure power is removed from DC circuits by turning off the power line servicing the circuits.
  • Make sure to remove the ground connection last when removing power.
  1. Put on a grounded, anti-static ESD strap.
  2. Disconnect the power cable from the DC power source.
  3. Squeeze the latch release.
  4. Remove the power supply from the switch using the power supply latch release and handle.
  5. Remove each power cable lug to the terminal studs with the flange locking nuts.
  6. Remove the flange locking nuts to each of the terminal studs.
  7. Disconnect the power cable lug from the terminal studs.

Installing DC Power Supply

You must make space for installing the power supply by removing an existing one (Removing AC Power Supply, Removing DC Power Supply) or removing a blank (Removing Power Supply Blank) from a power supply slot available on the switch.
Perform the following steps to install a DC power supply.
  1. Put on a grounded ESD strap.
  2. Unpack the new power supply.
  3. Connect the cables for your power supply as explained in the guide (Cabling the Modular Switch).
  4. Insert the new power supply into the empty power supply slot.
  5. After you insert the power supply, push gently on the power supply until the power supply is fully seated.
  6. Connect to the power source.
  7. Verify normal operation using the LED indicators for your switch Table 6.

Removing Power Supply Blank

The power supply blank is held in place by friction.
  1. Put on a grounded, anti-static ESD strap.
  2. Remove the blank from the power supply slot you are going to populate.
    Note: You may want to save the blank for future use as needed. The blank is needed for the switch to operate normally if a power supply slot is not populated.

     

Fabric and Fan Module (Fabric Module)

The fabric and fan modules are hot-swappable. They are accessible from the rear of the switch (Rear Panel). You must take into account that the module you are inserting is compatible with the switch and the module that you are replacing. Perform the following steps to remove and replace a fabric and fan module, or a fan-only module, if your switch supports one.

Note: The DCS-7816 switch has twelve fabric modules, each of half height.

Removing Fabric Module

  1. Put on a grounded, anti-static ESD strap.
  2. Loosen the two Phillips screws on fabric module.
    Note: The DCS-7812R3-FM fabric module has green latch release buttons. Use these instead.
  3. Pull out the ejector levers on the fabric module.
    1 Fabric module ejector levers 3 Fabric module ejector claws 5 Fabric module ejector claw
    2 Claw position on chassis 4 Claw position on chassis 6 Claw position on chassis

     

  4. Pull the ejector handles outwards by 90 degrees to disengage the fabric module.
  5. Pull on the ejector handles to remove the fabric module from the slot.
    Note: Fabric modules can be heavier than 25 lbs. Provide adequate support while handling them to prevent injury or damage.

     

Installing Fabric Module

You must make space for installing the module by removing an existing one (Removing Fabric Module) from a fabric module slot available on the switch.
Perform the following steps to install the module:
  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the module to be installed.
  3. Slide the module into the open slot until the injector claw is touching the rear face of the chassis.
    1 Fabric module top right injector claw 4 Claw position on chassis 7 Fabric module bottom left injector claw
    2 Fabric module top right ejector claw 5 Fabric module top injector claws 8 Claw position on chassis
    3 Fabric module ejector levers 6 Claw position on chassis    

     

  4. Fully open the ejector levers at 90 degrees and seat the module.
    Note: The ejector claws should be touching the rear face of the chassis.
    1 Fabric module ejector levers 3 Fabric module seating claws 5 Fabric module seating claw
    2 Claw position on chassis 4 Claw position on chassis 6 Claw position on chassis

     

  5. Close the ejector levers in unison.
    CAUTION: Ensure that the claws engage correctly on the chassis.
    1 Fabric module ejector levers 4 Claw position on chassis 7 Screw
    2 Claw position on chassis 5 Fabric module ejector claw 8 Screw
    3 Fabric module ejector claws 6 Claw position on chassis    

     

  6. Screw in the two Phillips screws using a PH3 driver on a battery operated screwdriver with torque set between 16 and 18 in-lbs.
    Note: The DCS-7812 does not require screws.The green latch release buttons will pop out when the fabric module is seated.

     

  7. Verify that the module is operating normally (Table 4).
  8. Use the show environment cooling command to further verify normal operation.

Fan Module (within Fabric Module)

The fabric and fan modules are hot-swappable. They are accessible from the rear of the switch (Rear Panel). You must take into account that the module you are inserting is compatible with the switch and the module that you are replacing. Perform the following steps to remove and replace a fan module which is part of the fabric module.

  1. Remove the fabric module with the fan to be replaced (Removing Fabric Module).
  2. Place the fabric module on a flat work surface. A cart or table designated for such tasks is typically appropriate.
  3. Locate the failed fan and
    1. Push the green latch then
    2. Rotate the fan lever to the open position.
      Note: See figure below.
    1 Release latch
    2 Fan lever
  4. Lift the fan straight up and out of the fabric module.
  5. Insert the replacement fan straight down and into the fabric module.
  6. Rotate the fan lever to the closed position.
  7. Ensure that the green latch has securely slid into the latched and locked position.
  8. Reinstall the fabric module into the chassis (Installing Fabric Module).
Note: The DCS-7816 switch has twelve fabric modules, each of half height, and currently does not have a label to depict fan removal.

Supervisor Module

The supervisor modules are hot-swappable. They are accessible from the front of the switch. You must take into account that the module you are inserting is compatible with the switch and the module that you are replacing. Use the following procedure to remove and replace a supervisor module. For the supervisor module locations for your device, refer to Front Panel.

Removing Supervisor Module

Perform the following steps to remove the module.
  1. Put on a grounded ESD strap.
  2. Use the extraction tool supplied (Front Panel) to unlock the supervisor card.
  3. Pull the supervisor module out.
  4. Slide supervisor module out of the slot.

Installing Supervisor Module

You must make space for installing the module by removing an existing one (Removing Supervisor Module) or removing a blank (Removing Supervisor Module Blank) from a supervisor module slot available on the switch.
Perform the following steps to install the module:
  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the supervisor module to be installed.
  3. Slide supervisor module into slot.
  4. Lock the supervisor module in place using the tool supplied (Front Panel).
  5. Verify that the module is operating normally (Table 1).

Removing Supervisor Module Blank

The supervisor module blank has plastic latches.
  1. Put on a grounded, anti-static ESD strap.
  2. Grip the plastic handles to release the latch and remove the blank from the supervisor module slot you are going to populate.

    You may want to save the blank for future use as needed. The blank is needed for the switch to operate normally if a supervisor module slot is not populated.

Line Cards

The line cards are hot-swappable. They are accessible from the front of the switch. You must take into account that the line card you are inserting is compatible with the switch and the line card that you are replacing. Use the following procedure to remove and replace a line card. If you are adding a new line card, remove the blank from the line card slot and install the new line card. For the line card locations on your switch, refer to Front Panel.

Removing Line Card

Perform the following steps to remove a line card:
  1. Put on a grounded, anti-static ESD strap.
  2. Use the tools supplied (Front Panel) simultaneously on each end of the line card.
  3. Pull the line card out gently once released.
  4. Slide line card out of the slot.

Installing Line Card

You must make space for installing the linecard by removing an existing one (Removing Line Card) or removing a blank (Removing Line Card Blank) from a linecard slot available on the switch.
  1. Put on a grounded, anti-static ESD strap.
  2. Unpack the line card to be installed.
  3. Slide the line card into the slot.
  4. Use the tools supplied (Front Panel) simultaneously on each end of the line card to lock it in place.
  5. Verify that the line card is operating normally (Line Card Module Indicators).

Removing Line Card Blank

Perform the following steps to remove line card blank:
  1. Put on a grounded, anti-static ESD strap.
  2. Grip the plastic handles to release the latch and remove the blank from the line card slot you are going to populate.

    The line card blank has plastic latches. You may want to save the blank for future use as needed. The blank is needed for the switch to operate normally if a line card slot is not populated.