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Maintaining the EX9253 Line Cards

 

Handling and Storing Line Cards

Components in the line cards are fragile. To avoid damaging the line cards, follow the procedures in this topic. The procedures use the following terms to describe the four edges of the line cards:

  • Faceplate—Edge of the line card that has connectors into which you insert the transceivers.

  • Connector edge—Edge opposite the faceplate.

  • Top edge—Edge at the top of the line card when the line card is vertical.

  • Bottom edge—Edge at the bottom of the line card when the line card is vertical.

Caution

Failure to handle line cards as specified in these procedures can cause irreparable damage to them.

Holding a Line Card

You must hold a line card horizontally when installing it in the chassis. You may hold a line card vertically or horizontally when carrying it.

Caution

Be prepared to support the full weight as you slide the line card into the chassis.

To hold a line card vertically:

  1. Orient the line card so that the faceplate faces you. To verify the orientation, confirm that the text on the line card is right-side up.
  2. Place one hand around the line card faceplate about a quarter of the way down from the top edge. Do not press hard on it.
  3. Place the other hand at the bottom edge of the line card.

If the line card is horizontal before you grasp it, place your left hand around the faceplate and your right hand along the bottom edge.

To hold a line card horizontally:

  1. Orient the line card so that the faceplate faces you.
  2. Grasp the top edge with your left hand and the bottom edge with your right hand.

You can rest the faceplate of the line card against your body as you carry it.

Caution

Take care not to hit the line card against any object as you carry it. Line card components are fragile.

Never hold or grasp the line card anywhere except the places mentioned in these procedures. In particular, never grasp the connector edge. See Figure 1.

Figure 1: Do Not Grasp the Connector Edge
Do Not Grasp the Connector Edge

Never carry the line card while holding the faceplate with only one hand.

Do not rest any edge of a line card directly against a hard surface. See Figure 2.

Figure 2: Do Not Rest the Edge of a Line Card on a Hard Surface
Do Not
Rest the Edge of a Line Card on a Hard Surface

If you must rest a line card temporarily on an edge, place a cushion between the edge and the surface.

Do not stack line cards on top of one another or on top of any other component. Place each line card separately in an antistatic bag or on an antistatic mat placed on a flat, stable surface.

Storing a Line Card

You must store a line card in the chassis or in a spare shipping container, horizontally and sheet metal side down. Do not stack line cards on top of one another or on top of any other component. Place each line card separately in an antistatic bag or on an antistatic mat placed on a flat, stable surface.

Note

Because a line card is heavy, and because antistatic bags are fragile, inserting the line card into the bag is best done with two people, each to do one of the following steps.

To insert a line card into an antistatic bag:

  1. Hold the line card in the horizontal position with the faceplate facing you.
  2. Slide the opening of the bag over the line card connector edge.

If you must insert the line card into a bag by yourself:

  1. Lay the line card horizontally on a flat, stable surface, sheet metal side down.
  2. Orient the line card with the faceplate facing you.
  3. Carefully insert the line card connector edge into the opening of the bag and pull the bag toward you to cover the line card.

Maintaining Line Card Cables

Components in the line cards are fragile. To extend the lives of your line card cables and to avoid problems that can result from cable damage, follow these procedures:

To maintain line card cables:

  • Place excess cable out of the way. Do not allow fastened loops of cable to dangle from the connector. Placing fasteners on the loops helps retain their shape.

  • Keep the cable connections clean and free of dust and other particles, which can cause drops in the received power level. Always inspect cables and clean them if necessary before connecting a port.

  • Label both ends of line card cables to identify them.

Removing a Line Card from an EX9253 Switch

EX9253 switches have field-replaceable unit (FRU) line cards that can be installed in the line card slots on the front of the switch chassis. The line cards are hot-insertable and hot-removable: You can remove and replace them without powering off the switch or disrupting switch functions. However, we recommend that you take them offline before removing them. To maintain proper cooling, you must install a replacement line card or a blank panel in the line card slot shortly after removing a line card from the chassis.

Before you begin to remove a line card from an EX9253 switch:

Ensure that you have the following parts and tools available to remove a line card from an EX9253 switch chassis:

  • ESD grounding strap

  • An antistatic bag or an antistatic mat

  • Replacement line card or a cover panel and its screws to cover the empty slot

To remove a line card from an EX9253 switch (see Figure 3):

  1. Place the antistatic bag or antistatic mat on a flat, stable surface.
  2. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  3. Label the cables connected to each port on the line card so you can reconnect the cables to the correct ports.
  4. Use one of the following methods to take the line card offline:

    • Press and hold the OFFLINE button on the line card by using a narrow-ended tool that fits inside the opening that leads to the button until the OK/FAIL LED next to the button is unlit. You must not use any sharp object to press the OFFLINE button.

    • Issue the following CLI command:

      user@switch>request chassis fpc slot slot-number offline
  5. Rotate the ejector handles simultaneously counterclockwise to unseat the line card.Caution

    Do not lift the line card by holding the ejector handles on the faceplate or the edge connectors. A fully configured line card can weigh up to 18.35 lb (8.3 kg). The ejector handles cannot support the weight of the line card. Lifting the line card by the ejector handles might bend them. Bent ejector handles prevent line cards from being properly seated in the chassis.

    Caution

    Do not stack line cards on top of one another or on top of any other component. Place each line card separately in the antistatic bag or on the antistatic mat placed on a flat, stable surface.

  6. Grasp the handles and gently slide the line card halfway out of the chassis (see Handling and Storing Line Cards).
  7. Place one hand around the faceplate of the line card and the other hand under the line card to support it. Taking care not to touch line card components, pins, leads, or solder connections, gently slide the line card completely out of the chassis and place it in an antistatic bag or on its own antistatic mat placed on a flat, stable surface.Caution

    After the OK/FAIL LED is unlit, wait at least 30 seconds before inserting the line card, removing a line card from a different slot, or inserting a line card in another slot.

  8. If you are not installing a line card in the emptied line card slot within a short time, install a cover panel over the slot. Do this to protect the interior of the chassis from dust or other foreign substances and to ensure that the airflow inside the chassis is not disrupted.
    Figure 3: Removing a Line Card
    Removing a Line
                                      Card

Installing a Line Card in an EX9253 Switch

EX9253 switches have field-replaceable unit (FRU) line cards that can be installed in the line card slots on the front of the switch chassis. The line cards are hot-insertable and hot-removable: You can remove and replace them without powering off the switch or disrupting switch functions. However, we recommend that you take them offline before removing them.

Before you begin to install a line card:

Ensure that you have the following parts and tools available to install a line card in the switch:

  • ESD grounding strap

Note

A fully configured line card can weigh up to 18.35 lb (8.3 kg). Be prepared to support the full weight.

To install a line card in the switch (see Figure 4):

  1. Wrap and fasten one end of the ESD wrist strap around your bare wrist, and connect the other end of the strap to the ESD point on the switch.
  2. If the line card slot has a cover panel on it, rotate the ejector handles simultaneously counterclockwise to unseat the cover panel.
  3. Grasp the ejector handles, and slide the cover panel out of the chassis. Save the cover panel for later use.
  4. Taking care not to touch line card components, pins, leads, or solder connections, remove the line card from its bag.Caution

    Do not lift the line card by holding the ejector handles on the faceplate or the edge connectors. A fully configured line card can weigh up to 18.35 lb (8.3 kg). The ejector handles cannot support the weight of the line card. Lifting the line card by the ejector handles might bend them. Bent ejector handles prevent line cards from being properly seated in the chassis.

  5. Place one hand around the faceplate of the line card and the other hand under the line card to support it.Caution

    Before you slide the line card into the slot on the switch chassis, ensure the line card is aligned correctly. Misalignment might cause the pins to bend, making the line card unusable.

  6. Lift the line card, and position it in the chassis with the faceplate facing you and the sides of the line card aligned with the guides in the line card slot on the switch chassis.
  7. Make sure the handles stay in the open position and gently slide the line card fully into the slot using both hands.
  8. Rotate both the ejector handles clockwise simultaneously to seat the line card.
  9. Use one of the following methods to bring the line card online:

    • Press and hold the OFFLINE button on the line card by using a narrow-ended tool that fits inside the opening that leads to the button for about 5 seconds until the OK/FAIL LED next to the button is lit steadily. You must not use any sharp object to press the OFFLINE button.

    • Issue the following CLI command:

      user@switch>request chassis fpc slot slot-number online
    Note

    When a line card is brought online, if the aggregate interface is initialized before the child interface is marked as part of the aggregate interface, there might be a loss of traffic from the aggregate interface for up to 30 seconds and the CPU usage of the line card installed on the switch might go up to 100%.

    Caution

    After the OK/FAIL LED is lit steadily, wait at least 30 seconds before removing the line card, removing a line card from a different slot, or inserting a line card in another slot.

    Figure 4: Installing a Line Card
    Installing a Line
Card

You can verify that the line card is functioning correctly by issuing the show chassis fpc and show chassis fpc pic-status commands.

Note

If you have a Juniper J-Care service contract, register any addition, change, or upgrade of hardware components at https://www.juniper.net/customers/support/tools/updateinstallbase/ . Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.