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Maintaining MX104 Components

MX104 Field-Replaceable Units (FRUs)

Field-replaceable units (FRUs) are router components that can be replaced at the customer site. Replacing most FRUs requires minimal router downtime. The router uses the following types of FRUs:

  • Hot-removable and hot-insertable FRUs—You can remove and replace these components without powering off the router or disrupting the routing functions.

  • Hot-pluggable FRUs—You can remove and replace these components without powering off the router, but the routing functions of the system are interrupted when the component is removed.

Table 1 lists the FRUs for the MX104 router. Before you replace a Routing Engine, you must take the Routing Engine offline.

Table 1: Field-Replaceable Units

Hot-Removable and Hot-Insertable FRUs

Hot-Pluggable FRUs

  • Air filter

  • Backup Routing Engine (if redundant)

  • Primary Routing Engine (if nonstop active routing is configured)

  • Modular Interface Cards (MICs)

  • AC and DC power supplies (if redundant)

  • Fan tray

  • Transceivers

  • Primary Routing Engine (if nonstop active routing is not configured)

  • Routing Engine (nonredundant)

Routine Maintenance Procedures for the MX104 Router

Purpose

For optimum router performance, perform preventive maintenance procedures.

Action

  • Inspect the installation site for moisture, loose wires or cables, and excessive dust. Make sure that airflow is unobstructed around the router and into the air intake vents.

  • Inspect the air filter on the side of the fan tray, replacing them every six months. Do not run the router for more than a few minutes without the air filter in place.

  • Check the status-reporting devices on the front panel: system alarms and LEDs.

Replacing an MX104 Console or Auxiliary Cable

Note:

The AUX port is not supported.

Removing an MX104 Console or Auxiliary Cable

To remove a serial cable connected to a console or auxiliary device:

  1. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  2. Press the tab on the connector, and pull the connector straight out of the AUX or CONSOLE port. Figure 1 shows the connector.
  3. Disconnect the cable from the console or auxiliary device.
Figure 1: Ethernet Cable ConnectorsEthernet Cable Connectors

Installing an MX104 Console or Auxiliary Cable

The CONSOLE port on the front panel of the router accepts an RS-232 (EIA-232) serial cable with RJ-45 connectors.

Note:

The AUX port is not supported.

To connect a cable between the router and the console or auxiliary device:

  1. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  2. Connect one end of the replacement cable into the CONSOLE/AUX port.
  3. Plug the other end of the cable into the device's serial port.

Replacing an MX104 Management Ethernet Cable

Removing an MX104 Management Ethernet Cable

To remove a serial cable connected to a management device:

  1. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  2. Press the tab on the connector, and pull the connector straight out of the ETHERNET port. Figure 2 shows the connector.
  3. Disconnect the cable from the network device.
Figure 2: Ethernet Cable ConnectorsEthernet Cable Connectors

Installing an MX104 Management Ethernet Cable

To install a serial cable connected to a management device:

  1. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  2. Plug one end of the replacement cable into the appropriate ETHERNET port.
  3. Plug the other end of the cable into the network device.

Replacing an MX104 Fiber-Optic Cable

Disconnecting an MX104 Fiber-Optic Cable

The MX104 router has field-replaceable unit (FRU) optical transceivers to which you can connect fiber-optic cables.

Before you begin disconnecting a fiber-optic cable from an optical transceiver installed in an MX104 router, ensure that you have taken the necessary precautions for safe handling of lasers (see Laser Safety Warnings for Juniper Networks Devices).

Ensure that you have the following parts and tools available:

  • A rubber safety cap to cover the transceiver

  • A rubber safety cap to cover the fiber-optic cable connector

To disconnect a fiber-optic cable from an optical transceiver installed in the router:

  1. Disable the port in which the transceiver is installed by issuing the following command:
    Laser 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 transceivers emit laser light that can damage your eyes.

  2. Carefully unplug the fiber-optic cable connector from the transceiver.
  3. Cover the transceiver with a rubber safety cap.
    Laser Warning:

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

  4. Cover the fiber-optic cable connector with the rubber safety cap.

Connecting an MX104 Fiber-Optic Cable

Before you begin connecting a fiber-optic cable to an optical transceiver installed in a router, ensure that you have taken the necessary precautions for safe handling of lasers (see General Laser Safety Guidelines for Juniper Networks Devices).

MX104 routers have field-replaceable unit (FRU) optical transceivers to which you can connect fiber-optic cables.

To connect a fiber-optic cable to an optical transceiver installed in a router:

Laser 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 transceivers emit laser light that can damage your eyes.

  1. If the fiber-optic cable connector is covered by a rubber safety cap, remove the cap. Save the cap.
  2. Remove the rubber safety cap from the optical transceiver. Save the cap.
  3. Insert the cable connector into the optical transceiver (see Figure 3).
    Figure 3: Connecting a Fiber-Optic Cable to an Optical Transceiver Installed in a RouterConnecting a Fiber-Optic Cable to an Optical Transceiver Installed in a Router
  4. Secure the cables so that they are not supporting their own weight. Place excess cable out of the way in a neatly coiled loop. Placing fasteners on a loop helps cables maintain their shape.
    CAUTION:

    Do not bend fiber-optic cables beyond their minimum bend radius. An arc smaller than a few inches in diameter can damage the cables and cause problems that are difficult to diagnose.

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

Replacing an MX104 Alarm Cable

Disconnecting the Router from an External Alarm-Reporting Device

Ensure that you have the following parts and tools available:

  • Electrostatic discharge (ESD) grounding strap

  • 2.5-mm flat-blade (–) screwdriver

To connect an external device to an alarm relay contact:

  1. Remove the other end of the wires to the external device.
  2. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  3. Loosen the small screws on the face of the terminal block using a screwdriver and remove the block from the relay contact.
  4. Loosen the small screws on the side of the terminal block using a screwdriver. Remove existing wires from the slots in the front of the block.

Connecting the MX104 Router to an External Alarm-Reporting Device

Ensure that you have the following parts and tools available:

  • Electrostatic discharge (ESD) grounding strap

  • 2.5-mm flat-blade (–) screwdriver

To connect the router to external alarm-reporting devices, attach wires to the ALARM relay contacts on the front panel of the router. A system condition that triggers the red or yellow alarm on the router also activates the corresponding alarm relay contact.

The terminal blocks that plug into the alarm relay contacts are supplied with the router. They accept wire of any gauge between 20 AWG (0.52 mm2) and 14 AWG (2.08 mm2), which is not provided. Use the gauge of wire appropriate for the external device you are connecting.

To connect an external device to an alarm relay contact:

  1. Prepare the required length of wire with gauge between 20 AWG (0.52 mm2) and 14 AWG (2.08 mm2).
  2. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  3. While the terminal block is not plugged into the relay contact, use a screwdriver to loosen the small screws on its side. With the small screws on its side facing left, insert wires into the slots in the front of the block based on the wiring for the external device. Tighten the screws to secure the wire.
  4. Orient the terminal block according to the labels to the left of the appropriate relay contact (NC means “normally closed, C means “common,” and NO means “normally open”).
  5. Plug the terminal block into the relay contact and use a screwdriver to tighten the screws on the face of the block.
  6. Attach the other end of the wires to the external device.

If attaching a reporting device for the other kind of alarm, repeat the procedure.