ON THIS PAGE
Maintaining ACX4000 Components
Routine Maintenance Procedures for the ACX4000 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.
Check the status-reporting devices on the font panel—system LED.
See Also
Maintaining Cables That Connect to ACX4000 Network Ports
Purpose
For optimum router performance, verify the condition of the cables that connect to the network ports.
Action
On a regular basis:
Use the cable management bracket to support cables and prevent cables from dislodging or developing stress points.
Place excess cable out of the way in the cable management bracket. Do not allow fastened loops of cable to dangle from the connector or cable management bracket, 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.
See Also
Maintaining the ACX4000 Uplink Ports
Purpose
For optimum performance, verify the condition of the uplink ports.
Action
On a regular basis:
Check the port LEDs. The meaning of the LED states differs for various uplink ports. For more information, see ACX4000 LEDs Overview. If the router detects a port failure, the router generates an alarm message to be sent to the Routing Engine.
A green status LED indicates that the port is functioning normally.
From the CLI, issue the
show chassis fpc pic-status
command.user@host> show chassis fpc pic-status Slot 0 Online PIC 0 Online 16x CHE1T1, RJ48 PIC 1 Online 8x 1GE(LAN) RJ45 PIC 2 Online 2x 1GE(LAN) SFP PIC 3 Online 2x 10GE(LAN) SFP+
See Also
Replacing an ACX4000 MIC
Removing an ACX4000 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.
In the ACX4000 router, the MICs can be installed in two slots in the front of the router. A MIC weighs less than 2 lb (0.9 kg).
To remove a MIC (see Figure 1):

See Also
Replacing an ACX4000 Transceiver
Small form-factor pluggable transceivers (SFPs) are optical transceivers that are installed in the front panel of the ACX4000 router. Transceivers are hot-insertable and hot-removable.
Removing an ACX4000 Transceiver
Removing a transceiver does not interrupt router functioning, but the removed transceiver no longer receives or transmits data.
To remove a transceiver (see Figure 3):
After removing a transceiver from the chassis, wait at least 30 seconds before reinserting it or inserting a transceiver into a different slot.
See Also
Installing an ACX4000 Transceiver
To install a transceiver:
See Also
Replacing an ACX4000 Fiber-Optic Cable
To replace a fiber-optic cable:
Disconnecting an ACX4000 Fiber-Optic Cable
ACX Series routers have 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 ACX Series router, ensure that you have taken the necessary precautions for safe handling of lasers (see Radiation from Open Port Apertures Warning and Laser and LED Safety Guidelines and Warnings).
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:
Connecting an ACX2000 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 Radiation from Open Port Apertures Warning and Laser and LED Safety Guidelines and Warnings).
ACX Series 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 an ACX Series router:
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.
See Also
Replacing an ACX4000 Management Ethernet Cable
Removing an ACX4000 Management Ethernet Cable
To remove a serial cable connected to a management device:
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Press the tab on the connector, and pull the connector straight out of the MGMT port. Figure 5 shows the connector.
- Disconnect the cable from the network device.

See Also
Installing an ACX4000 Management Ethernet Cable
To install a serial cable connected to a management device:
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Plug one end of the replacement cable into the appropriate MGMT port.
- Plug the other end of the cable into the network device.
See Also
Replacing an ACX4000 Console or Auxiliary Cable
Removing an ACX4000 Console or Auxiliary Cable
To remove a serial cable connected to a console or auxiliary device:
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Press the tab on the connector, and pull the connector straight out of the CONSOLE/AUX port. Figure 6 shows the connector.
- Disconnect the cable from the console or auxiliary device.

See Also
Installing an ACX4000 Console or Auxiliary Cable
The CONSOLE/AUX port on the front panel of the router accepts an RS-232 (EIA-232) serial cable with RJ-45 connectors.
To connect a cable between the router and the console or auxiliary device:
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Connect one end of the replacement cable into the CONSOLE/AUX port.
- Plug the other end of the cable into the device's serial port.
See Also
Replacing an ACX4000 Air Filter
Removing an ACX4000 Air Filter
Do not run the device for more than a few minutes without the air filter in place.
Do not run the device for more than a few minutes without the air filter in place.
Always keep the air filter in place while the device is operating, except during replacement. Because the fans are very powerful, they could pull small bits of wire or other materials into the device through the unfiltered air intake. This could damage device components.
The air filter is installed on the right side of the fan tray. To remove the air filter (see Figure 7):
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Remove the fan tray as described in Replacing an ACX4000 Fan Tray.
- Grasp the sides of the air filter, and slide it away from the fan tray faceplate.

See Also
Installing an ACX4000 Air Filter
The air filter installs on the right side of the fan tray. To install the air filter (see Figure 8):
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Insert the air filter between the tabs on the side of the fan tray, and seat it in place.

See Also
Replacing an ACX4000 Fan Tray
Removing an ACX4000 Fan Tray
To prevent overheating, install the replacement fan tray immediately after removing the existing fan tray.
To remove the fan tray (see Figure 9):

See Also
Installing an ACX4000 Fan Tray
To install the fan tray (see Figure 10):
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Orient the fan tray in the slot so that the arrow is pointing up, and slide the fan tray straight into the chassis.
- Verify that the ejector lever on the front of the fan tray is engaged by pushing it toward the router.
- Tighten the captive screws on the fan tray faceplate to secure it in the chassis.

See Also
Replacing an ACX4000 AC Power Supply
Removing an ACX4000 AC Power Supply
Before you remove a power supply, be aware of the following:
The minimum number of power supplies must be present in the router at all times.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.
After powering off a power supply, wait at least 60 seconds before turning it back on.
To remove an AC power supply (see Figure 12):
- Switch off the dedicated customer site circuit breaker for the power supply, and remove the power cord from the AC power source. Follow the instructions for your site.
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Remove the power cord from the power supply.
- Press the release latch on the right side of the power supply to disconnect the power supply from the chassis.
- Pull the power supply straight out of the chassis.


See Also
Installing an ACX4000 AC Power Supply
See Also
Replacing an ACX4000 DC Power Supply
Removing an ACX4000 DC Power Supply
Before you remove a power supply, be aware of the following:
The minimum number of power supplies must be present in the router at all times.
Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.
After powering off a power supply, wait at least 60 seconds before turning it back on.
To remove a DC power supply (see Figure 14):
- Switch off the dedicated customer site circuit breaker for the power supply being removed. Follow your site's procedures for ESD.
- Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance that the cables might become active during the removal process.
- Verify that the status LED on the power supply is not lit.
- Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
- Move the DC circuit breaker on the DC power supply faceplate to the off (O) position.
- Remove the clear plastic cover protecting the terminal studs on the faceplate (see Figure 15).
- Remove the screw from each of the terminals. (Use a number 2 Phillips screwdriver.)
- Remove the cable lugs from the terminals.
- Carefully move the power cables out of the way.
- Press the latch located on the left side of the power supply, to release it from the chassis.
- Pull the power supply straight out of the chassis.


Installing an ACX4000 DC Power Supply
Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
To install a DC power supply (see Figure 16):

