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Maintaining MX10003 Interface Modules

 

Maintaining MICs

Purpose

For optimum router performance, verify the condition of the MICs.

Action

On a regular basis:

  • Check the LEDs on MIC faceplates. The meaning of the LED states differs for various MICs. For more information, see the MX Series Interface Module Reference. If the MPC that houses the MIC detects a MIC failure, the MPC generates an alarm message to be sent to the Routing Engine.

  • Issue the show chassis fpc pic-status CLI command. The MIC slots in an MPC are numbered PIC 0 and PIC 1, right to left:

    user@host> show chassis fpc pic-status

    For further description of the output from the command, see the CLI Explorer.

Replacing an MX10003 MIC

Removing an MX10003 MIC

MICs are hot-insertable and hot-removable. When you remove a MIC, the router continues to function, although the MIC interfaces being removed no longer function.

Note

On the MX10003 MPC (Multi-Rate), only the MIC in slot 1 is removable. The MIC in slot 0 is fixed to the MPC and cannot be removed.

The MICs are located in the MPCs installed at the front of the router. A typical MIC weighs around 3 lb (1.36 kg).

To remove a MIC (see Figure 2):

  1. Place an electrostatic bag or antistatic mat on a flat, stable surface to receive the MIC. If the MIC connects to fiber-optic cable, have ready a rubber safety cap for each transceiver and cable.
  2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  3. Use one of the following methods to take the MIC offline:

    • Press its OFFLINE button. Use a narrow-ended tool that fits inside the opening that leads to the button. Press and hold the button (for about 5 seconds) until the MIC’s OK/FAIL LED goes off. Figure 1 shows the location of the OFFLINE button on the MIC.

      Figure 1: JNP-MIC
      JNP-MIC

    • Issue the following CLI command:

      user@host> request chassis pic fpc-slot fpc-slot pic-slot pic-slot offline

      For more information about the command, see the Junos OS System Basics and Services Command Reference  .

  4. Label the cables connected to the MIC so that you can later reconnect each cable to the correct MIC.
  5. Disconnect the cables from the MIC. If the MIC uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  6. Arrange the cable to prevent it from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop. Caution

    Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  7. Pull both the ejector levers of the MIC you are removing away from the MPC faceplate. Doing this disconnects the MIC from the MPC.
  8. Grasp the handles on the MIC faceplate, and slide the MIC out of the MPC card carrier. Place it in the electrostatic bag or on the antistatic mat.
  9. If you are not reinstalling a MIC into the emptied MIC slot within a short time, install a blank MIC panel over the slot to maintain proper airflow in the MPC card cage.
Figure 2: Removing a MIC
Removing a MIC

Installing an MX10003 MIC

To install a MIC (see Figure 3):

  1. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to one of the ESD points on the chassis.
  2. If the MIC uses fiber-optic cable, verify that a rubber safety cap is over each transceiver on the faceplate. Install a cap if necessary.
  3. Align the rear of the MIC with the guides located at the corners of the MIC slot.
  4. Grasp and press both the MIC ejector handles inward, and slide the MIC until the ejectors latch into the MPC.Caution

    Slide the MIC straight into the slot to avoid damaging the components on the MIC.

  5. Verify that the ejector lever is engaged properly by pushing it toward the MIC faceplate.
  6. If the MIC uses fiber-optic cable, remove the rubber safety cap from each transceiver and the end of each cable.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  7. Insert the appropriate cables into the cable connectors on the MIC.
  8. Arrange each cable to prevent the cable from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop. Caution

    Do not let fiber-optic cable hang free from the connector. Do not allow fastened loops of cable to dangle, which stresses the cable at the fastening point.

    Caution

    Avoid bending fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  9. To bring the MIC online:

    • Issue the following CLI command:

      user@host> request chassis pic fpc-slot fpc-slot pic-slot pic-slot online

      For more information about the command, see the Junos OS System Basics and Services Command Reference  .

    • For bringing MIC1 online using the button:

      Press the OFFLINE button on MIC1 until the MIC OK/FAIL LED lights green. Figure 1 shows the location of the offline button on the MIC. Use a narrow-ended tool that fits inside the opening that leads to the button.

    Note

    There is no OFFLINE button for the built-in MIC (MIC0). You can use the OFFLINE button on MIC1 to make the MIC1 offline and online.

    The normal functioning OK/FAIL LED confirms that the MIC is online. You can also verify correct MIC functioning by issuing the show chassis fpc pic-status command.

Figure 3: Installing a MIC
Installing a MIC

See also

Maintaining MPCs

Purpose

The router can have up to two MPCs mounted horizontally in the card cage at the front of the chassis. For optimum router performance, verify the condition of the MPCs.

Action

On a regular basis:

  • Check the OK/FAIL LED on the MPC. If the MPC detects a failure, the MPC sends an alarm message to the Routing Engine.

  • Issue the show chassis fpc CLI command to check the status of installed MPCs. As shown in the sample output, the value Online in the column labeled State indicates that the MPC is functioning normally:

    user@host> show chassis fpc

    For more detailed output, add the detail option. The following example does not specify a slot number, which is optional:

    user@host> show chassis fpc detail

  • Issue the show chassis fpc pic-status CLI command. The MPC slots are numbered 0 and 1, bottom to top:

    user@host> show chassis fpc pic-status

    For further description of the output from the command, see the CLI Explorer.

Replacing an MX10003 MPC

Removing an MX10003 MPC

When you remove an MPC, the router continues to function, although the MIC interfaces installed on the MPC being removed no longer function.

An MPC installs horizontally in the front of the router. The MPCs are hot-insertable and hot-removable. A fully configured MPC can weigh up to 33 lb (14.96 kg). Be prepared to accept its full weight.

To remove an MPC (see Figure 4):

  1. Have ready a replacement MPC blank panel and an antistatic mat for the MPC. Also have ready rubber safety caps for each MIC using an optical interface on the MPC that you are removing.
  2. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  3. Label the cables connected to each MIC on the MPC so that you can later reconnect the cables to the correct MICs.
  4. Use one of the following methods to take the MPC offline:

    • Press and hold the OFFLINE button on the MPC. The green OK/FAIL LED next to the button begins to blink. Hold the button down until the LED goes off. Use a narrow-ended tool that fits inside the opening that leads to the button.

    • Issue the following CLI command:

      user@host>request chassis fpc slot slot-number offline

      For more information about the command, see the CLI Explorer.

  5. Disconnect the cables from the MICs installed in the MPC. Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

    Caution

    Avoid bending a fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  6. If a MIC uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap.
  7. Arrange the disconnected cables in the cable management brackets to prevent the cables from developing stress points.
  8. Simultaneously turn both the ejector handles counterclockwise to unseat the MPC.
  9. Grasp the handles, and slide the MPC straight out of the card cage halfway.
  10. Place one hand around the front of the MPC and the other hand under it to support it. Slide the MPC completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.Caution

    The weight of the MPC is concentrated in the back end. Be prepared to accept the full weight as you slide the MPC out of the chassis.

    When the MPC is out of the chassis, do not hold it by the ejector handles, bus bars, or edge connectors. They cannot support its weight.

    Do not stack MPCs on top of one another after removal. Place each one individually in an electrostatic bag or on its own antistatic mat on a flat, stable surface.

  11. If necessary, remove the installed MIC from the MPC.
  12. After you remove each MIC, immediately place it on an antistatic mat or in an electrostatic bag.
  13. If you are not reinstalling an MPC into the emptied line card slots within a short time, install a blank MPC panel over each slot to maintain proper airflow in the card cage.Caution

    After removing an MPC from the chassis, wait at least 30 seconds before reinserting it or inserting an MPC into a different slot.

Figure 4: Removing an MPC
Removing an MPC

Installing an MX10003 MPC

An MPC installs horizontally at the front of the router. The MPCs are hot-insertable and hot-removable. A fully configured MPC can weigh up to 18.35 lb (8.3 kg). Be prepared to accept its full weight.

To install an MPC (see Figure 5):

  1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
  2. Place the MPC on an antistatic mat.
  3. Take the MIC to be installed in the replacement MPC out of its electrostatic bag.
  4. Verify that each fiber-optic MIC has a rubber safety cap covering the MIC transceiver. If it does not, cover the transceiver with a safety cap.
  5. Install the MIC into the appropriate slot on the MPC.
  6. Locate the slot in the card cage in which you plan to install the MPC.
  7. Orient the MPC so that the faceplate faces you.
  8. Lift the MPC into place, and carefully align the sides of the MPC with the guides inside the card cage.Caution

    When the MPC is out of the chassis, do not hold it by the ejector handles, bus bars, or edge connectors. They cannot support its weight.

  9. Slide the MPC all the way into the card cage until you feel resistance.
  10. Grasp both ejector handles, and rotate them clockwise simultaneously until the MPC is fully seated.
  11. If any of the MICs on the MPC connect to fiber-optic cable, remove the rubber safety cap from each transceiver and cable.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.

  12. Insert the appropriate cable into the cable connector ports on each MIC on the MPC. Secure the cables so that they are not supporting their own weight. Place excess cable out of the way in a neatly coiled loop, using the cable management system. Placing fasteners on a loop helps to maintain its shape.Caution

    Do not let fiber-optic cables hang free from the connector. Do not allow the fastened loops of a cable to dangle, which stresses the cable at the fastening point.

    Caution

    Avoid bending a fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  13. To bring the MPC online:

    • Issue the following CLI command:

      user@host>request chassis fpc slot slot-number online

      For more information about the command, see the CLI Explorer.

    Caution

    After the OK/FAIL LED lights steadily, wait at least 30 seconds before removing the MPC again, removing an MPC from a different slot, or inserting an MPC in a different slot.

You can also verify correct MPC and MIC functioning by issuing the show chassis fpc and show chassis fpc pic-status commands.

Figure 5: Installing an MPC
Installing an MPC

See also

Maintaining Cables That Connect to MPCs or MICs

Purpose

For optimum router performance, verify the condition of the cables that connect to the MPCs or MICs.

Action

On a regular basis:

  • Use the cable management brackets to support cables and prevent cables from dislodging or developing stress points.

  • Place excess cable out of the way in the cable management brackets. Do not allow fastened loops of cable to dangle from the connector or cable management brackets, because this stresses the cable at the fastening point. Putting fasteners on the loops helps to maintain 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 an interface.

  • Label both ends of the cables to identify them.

The following guidelines apply specifically to fiber-optic cables:

  • When you unplug a fiber-optic cable, always place a rubber safety plug over the transceiver on the faceplate and on the end of the cable.

  • Anchor fiber-optic cables to avoid stress on the connectors. Be sure to secure fiber-optic cables so that they do not support their own weight as they hang to the floor. Never let fiber-optic cable hang free from the connector.

  • Avoid bending fiber-optic cable beyond its bend radius. An arc smaller than a few inches can damage the cable and cause problems that are difficult to diagnose.

  • Frequent plugging and unplugging of fiber-optic cable into and out of optical instruments can cause damage to the instruments that is expensive to repair. Instead, attach a short fiber extension to the optical equipment. Any wear and tear due to frequent plugging and unplugging is then absorbed by the short fiber extension, which is easy and inexpensive to replace.

  • Keep fiber-optic cable connections clean. Small microdeposits of oil and dust in the canal of the transceiver or cable connector could cause loss of light, reducing signal power and possibly causing intermittent problems with the optical connection.

    To clean the transceivers, use an appropriate fiber-cleaning device, such as RIFOCS Fiber Optic Adaptor Cleaning Wands (part number 946). Follow the directions for the cleaning kit you use.

    After you clean an optical transceiver, make sure that the connector tip of the fiber-optic cable is clean. Use only an approved alcohol-free fiber-optic cable cleaning kit, such as the Opptex Cletop-S Fiber Cleaner. Follow the directions for the cleaning kit you use.

Replacing a Cable on an MX10003 MPC or MIC

Removing a Cable on an MPC or MIC

Removing and installing cables on an MPC or MIC does not affect router function.

To remove a cable:

  1. Have ready a rubber safety cap for each fiber-optic cable and transceiver.
  2. If removing all cables connected to the component, use one of the following methods to take the component offline:

    • To take an MPC offline:

      • Press and hold the corresponding OFFLINE button on the MPC. The green OK/FAIL LED next to the button begins to blink. Hold the button down until the LED goes off. Use a narrow-ended tool that fits inside the opening that leads to the button.

      • Issue the following CLI command:

        user@host>request chassis fpc slot slot-number offline

        For more information about the command, see the CLI Explorer.

    • To take a MIC offline:

      • Press the OFFLINE button on the MIC. Use a narrow-ended tool that fits inside the opening that leads to the button. Press and hold the button until the MIC’s OK/FAIL LED goes off (about 5 seconds). Use a narrow-ended tool that fits inside the opening that leads to the button.

      • Issue the following CLI command:

        user@host> request chassis pic fpc-slot fpc-slot pic-slot pic-slot offline

        For more information about the command, see the CLI Explorer.

  3. Disconnect the cable from the cable connector port. If the component uses fiber-optic cable, immediately cover each transceiver and the end of each cable with a rubber safety cap.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when you are inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  4. Remove the cable from the cable management brackets.
  5. Disconnect the cable from the destination port.

Installing a Cable on an MPC or MIC

To install a cable:

  1. Have ready a length of the type of cable used by the MPC or MIC. For cable specifications, see the MX Series Interface Module Reference.
  2. If the cable connector port is covered by a rubber safety plug, remove the plug.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when you are inserting or removing cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  3. Insert the cable connector into the cable connector port on the component faceplate.
  4. Arrange the cable in the cable management brackets to prevent it from dislodging or developing stress points. Secure the cable so that it is not supporting its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop. Placing fasteners on the loop helps to maintain its shape.Caution

    Do not let fiber-optic cables hang free from the connector. Do not allow the fastened loops of a cable to dangle, which stresses the cable at the fastening point.

    Caution

    Avoid bending a fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  5. Insert the other end of the cable into the destination port.
  6. Repeat the previous steps for any additional cables.
  7. If the component is offline (its failure indicator LED is lit), use one of the following methods to bring the it online:

    • To bring an MPC online:

      • Press and hold the OFFLINE button on the MPC until the green OK LED next to the button lights steadily, in about 5 seconds. Use a narrow-ended tool that fits inside the opening that leads to the button.

      • Issue the following CLI command:

        user@host>request chassis fpc slot slot-number online

        For more information about the command, see the CLI Explorer.

    • To bring a MIC online:

      • Press the MIC OFFLINE button until the OK/FAIL LED lights green. Use a narrow-ended tool that fits inside the opening that leads to the button.

      • Issue the following CLI command:

        user@host>request chassis pic fpc-slot fpc-slot pic-slot pic-slot online

        For more information about the command, see the CLI Explorer.

    The normal functioning indicator LED confirms that the component is online. You can also verify correct DPC or MPC functioning by issuing the show chassis fpc command or correct MIC or the PIC functioning by issuing the show chassis fpc pic-status command.

See also

Replace an SFP, SFP+, or QSFP+ Transceiver

The transceivers for Juniper Networks devices are hot-removable and hot-insertable field-replaceable units (FRUs). You can remove and replace them without powering off the device or disrupting the device functions.

Figure 6: Small Form-Factor Pluggable (SFP) Transceiver
Small Form-Factor Pluggable (SFP) Transceiver

Remove a Transceiver

To remove a transceiver:

  1. Have ready a replacement transceiver or a transceiver slot plug, an antistatic mat, and a rubber safety cap for the transceiver.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  3. Label the cables connected to the transceiver so that you can reconnect them correctly later.
  4. Remove the cable connector from the transceiver. Immediately cover the transceiver and the end of the cable with a rubber safety cap.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.

  5. Pull the ejector handle out from the transceiver to unlock the transceiver. Caution

    Ensure that you open the ejector handle completely until you hear it click. Doing this prevents damage to the transceiver.

    Use needlenose pliers to pull the ejector handle out from the transceiver.

  6. Grasp the transceiver ejector handle, and pull the transceiver approximately 0.5 in. (1.3  cm) out of the interface port.
  7. Using your fingers, grasp the body of the transceiver, and pull it the rest of the way out of the interface port.
  8. Place a rubber safety cap over the transceiver.
  9. Place the removed transceiver on an antistatic mat or in an electrostatic bag.
Caution

After removing a transceiver from the chassis, wait at least 30 seconds before reinserting it or inserting a transceiver into a different slot.

Install a Transceiver

To install a transceiver:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  2. Take each transceiver to be installed out of its electrostatic bag, and identify the slot on the component where you will install it.
  3. Verify that each transceiver is covered by a rubber safety cap. If it is not, cover the transceiver with a safety cap.
  4. Carefully align the transceiver with the slots in the component. The connectors should face the component.
  5. Slide in the transceiver until the connector is seated in the component slot. If you are unable to fully insert the transceiver, ensure that the connector is facing the right way.
  6. Close the ejector handle of the transceiver.
  7. Remove the rubber safety cap from the transceiver and from the end of the cable. Insert the cable into the transceiver.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.

  8. Verify that the status LEDs on the component faceplate indicate that the transceiver is functioning correctly. For more information about the component LEDs, see the MX Series Interface Module Reference.

Replace a QSFP28 Transceiver

28-Gbps quad small form-factor pluggable (QSFP28) transceivers are hot-insertable and hot-removable. Removing a QSFP28 transceiver does not interrupt router functioning, but the removed QSFP28 transceiver no longer receives or transmits data.

Remove a QSFP28 Transceiver

To remove a QSFP28 transceiver (see Figure 7):

  1. Place an electrostatic bag or antistatic mat on a flat, stable surface to receive the QSFP28 transceiver. Have ready a rubber safety cap for the QSFP28 transceiver and the cable.
  2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  3. Label the cable connected to the QSFP28 transceiver so that you can later reconnect the cable to the correct QSFP28 transceiver.
  4. Disconnect the cable from the transceiver. Immediately cover the transceiver and the end of the cable with a rubber safety cap.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  5. Arrange the cable in the cable management system to prevent it from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.Caution

    Avoid bending the fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  6. Pull the transceiver’s rubber handle straight back. The locking pins on the transceiver automatically releases the transceiver. Place the transceiver on the antistatic mat or in the electrostatic bag.
    Figure 7: 28-Gbps Quad Small Form-Factor Pluggable (QSFP28) Transceiver
    28-Gbps Quad Small Form-Factor Pluggable (QSFP28) Transceiver

Install a QSFP28 Transceiver

To install a replacement QSFP28 transceiver:

  1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to the ESD point on the chassis.
  2. Verify that a rubber safety cap covers the QSFP28 transceiver.
  3. Orient the transceiver over the port in the router so that the QSFP28 connector faces the appropriate direction.
  4. Slide the transceiver into the slot until the locking pins lock in place. If there is resistance, remove the transceiver and flip it so that the connector faces the other direction.
  5. Remove the rubber safety cap from the transceiver and from the end of the cable, and insert the cable into the transceiver.Warning

    Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

    Caution

    Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.

  6. Arrange the cable in the cable management system to prevent the cable from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.Caution

    Do not let the fiber-optic cable hang free from the connector. Do not allow fastened loops of the cable to dangle, which stresses the cable at the fastening point.

    Caution

    Avoid bending the fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.

  7. Verify that the status LEDs on the router indicate that the QSFP28 transceiver is functioning correctly. You can also verify that the interface port is functioning by running the show chassis fpc pic-status command.