Cisco 8608 User manual

Replace Chassis Components
The images in this chapter are only for representation purposes, unless specified otherwise. The chassis' actual
appearance and size may vary.
Note
Whenever you replace any card, you must always ensure to secure the ejector thumbscrews properly.
Caution
•Replace a Route Processor Card, on page 1
•Replace Modular Port Adapters, on page 6
•Replace a Switch Card, on page 11
•Replace a Fan Spinner, on page 15
•Replace a Fan Module, on page 17
•Replace Power Modules, on page 20
Replace a Route Processor Card
The router supports up to two redundant Route Processor (RP) cards. When two RP cards are installed in the
router, one acts as an active card and the other as the standby card. If the router has only one RP card installed,
a new RP can be installed in the empty RP slot during operation.
• The replacement procedure for the RP cards is only applicable to the standby RP card. You need to
shutdown the router to replace an RP on a single-RP system. When you shutdown the standby RP card,
the router automatically shuts down the standby Switch Card (SC) as both of them belong to the same
operational domain. For example, when you shutdown RP0, the router shuts down the corresponding
SC0. When you shutdown RP1, the router shuts down SC1.
• To replace an active RP card, you must trigger a failover using the redundancy switchover command.
Note
Replace Chassis Components
1

Statement 1029—Blank Faceplates and Cover Panels
Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages
and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other
equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all
cards, faceplates, front covers, and rear covers are in place.
Warning
Statement 1034—Backplane Voltage
Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when
servicing
Warning
Before you begin
Before replacing the Route Processor (RP) card, you must perform a graceful shutdown of the card to avoid
disk corruption. Use one of the following procedures to perform graceful shutdown of the card:
• unscrew the captive screws, pull the release latch down, and open ejector lever to trigger auto-shutdown
of the card, and then verify that the Status LED is in Off state.
• use the shutdown location location command in admin EXEC mode to shutdown the card. Then use
the show platform command to verify that the Status LED is in Off state.
Procedure
Step 1 Open the packaging for the new RP card, inspect the card for damage, and verify that the card is the same
type as the other RP cards installed in the chassis.
If the RP card is damaged, alert the Technical Assistance Center (TAC).
Step 2 If you are installing the RP card in an empty slot, remove the blank card that is already in that slot by unscrewing
its captive screw and pulling it out of the slot. Go to Step 4.
Step 3 If you are replacing an RP card that is currently in the chassis, remove the existing card from the chassis by
following these steps:
a) Disconnect the following cables from the card:
• Console cable
• Ethernet Management cable
b) If there are any external drives attached to the card through its USB ports, detach those drives.
c) Perform the graceful shutdown of the RP. Run the shutdown location location command in admin EXEC
mode, which gracefully shuts down RP module to prevent any of the file systems from being corrupted.
d) Verify that the RP Status LED for the slot that you specified turns off. Also, you can verify that the card
is in the powered off state by running the show platform command.
e) Rotate the captive screw, press the latch, and rotate the ejector lever away from the front of the card (see
Callouts 1 and 2 in the following figure).
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Replace Chassis Components
Replace a Route Processor Card

The card unseats its connectors from the midplane and moves slightly out of the chassis.
Figure 1: Remove Route Processor Card from Chassis
Release the latch.2Unscrew the captive screw.1
Pull on the lever to slide the card partly out of
the chassis. Release the lever, hold the front of
the card, and pull the card all the way out of the
chassis.
4Rotate the ejector lever away from the card.3
f) Use one hand to hold the front of the card, place your other hand under the card to support its weight, pull
the card out of the chassis, and set it on an antistatic surface or inside an antistatic bag.
Step 4 To install a new card, follow these steps:
a) Pull the middle section of the ejector lever toward the end of the lever and rotate the lever away from the
front of the card.
This action opens the lever so that the card can be fully inserted into the slot.
b) Hold the front of the card with one hand and place your other hand under the card to support its weight.
c) Align the back of the card to the guides in the open route processor slot and slide the card all the way into
the slot (see the following figure).
The card stops when its front is about 0.25 inches (0.6 cm) outside the front of the chassis.
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3
Replace Chassis Components
Replace a Route Processor Card

Figure 2: Install Route Processor Card into Chassis
Press the latch upwards.3Slide the back end of the card into the open
route processor slot.
1
Rotate the captive screw to secure the route
processor card.
4Rotate the ejector lever towards the card.2
d) Rotate the lever all the way to the front of the chassis until it locks in place with a click.
Ensure that the other end of the lever engages behind the front of the slot so that the card fully seats onto
the connectors on the midplane.
e) Rotate the captive screw to secure the card to the chassis. Tighten the screws to 9.7 in-lbs (1.09 N-m) of
torque.
f) Attach the following cables to the card:
• Console cable—Attach to the Console port.
• Management cable—Attach to the Management Ethernet port.
Reload an RP card by using the reload location location command. Verify that the reloaded
RP card is again in the Operational state by using the show platform command.
To verify the mode of RP card, if it is in standby or active mode, use the show platform
domain command.
Note
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Replace Chassis Components
Replace a Route Processor Card

g) Verify that the route processor card LEDs turn on and appear as follows:
• The Status LED is in solid amber color and later turns to solid green color.
Figure 3: Route Processor LEDs
Sync1
Status2
Attention3
Management Activity4
GPS5
Active6
MigratingfromSingleRouteProcessorSystemtoDual-RouteProcessorSystem
The Cisco 8608 router supports a single Route Processor (RP) system and a dual Router Processor system.
This section provides step-by-step instructions for migrating from a single-RP system to a dual-RP system.
Replace Chassis Components
5
Replace Chassis Components
Migrating from Single Route Processor System to Dual-Route Processor System

1. From the SC slot, where you want to install a new SC, remove the fan trays, and then remove the Fan
Spinner. For more information, see Remove a Fan Spinner.
2. In the slot from where you removed the fan spinner, insert the standby Switch Card (SC). For more
information, see Install a Switch Card.
3. After you're done installing the SC, install the fan trays, and then install the RP card. For more information,
see Replace a Route Processor Card.
Migrating from Dual-Route Processor System to Single Route Processor System
This section provides step-by-step instructions for migrating from a dual-RP system to a single-RP system.
1. Remove the fan trays from the standby SC that you want to remove.
2. Remove the standby SC from the slot. For more information, see Remove a Switch Card.
3. Install a Fan Spinner in the slot where you've removed the standby SC. For more information, see Install
a Fan Spinner.
4. After you're done installing the Fan Spinner, install the fan trays. For more information, see Replace a
Fan Module.
Replace Modular Port Adapters
The following sections describe how to remove or install an MPA:
Remove a Modular Port Adapter
Before you begin:
Before replacing the Modular Port Adapter (MPA), you must perform a graceful shutdown of the module to
avoid disk corruption. Use one of the following procedures to perform graceful shutdown of the card:
• unscrew the captive screws, pull the release latch down, and open ejector lever to trigger auto-shutdown
of the card, and then verify that the Status LED is in Off state.
• use the shutdown location location command in admin EXEC mode to shutdown the card. Then use
the show platform command to verify that the Status LED is in Off state.
To remove an MPA, perform the following steps:
1. Ensure the router is in the NSR-ready state. Use the show redundancy command as shown in the following
example:
Router#show redundancy
Thu Jun 1 21:44:12.842 UTC
Redundancy information for node 0/RP0/CPU0:
==========================================
Node 0/RP0/CPU0 is in ACTIVE role
Partner node (0/RP1/CPU0) is in STANDBY role
Standby node in 0/RP1/CPU0 is ready
Standby node in 0/RP1/CPU0 is NSR-ready
Reload and boot info
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Replace Chassis Components
Replace Modular Port Adapters

----------------------
RP reloaded Wed May 31 16:03:53 2023: 1 day, 5 hours, 40 minutes ago
Active node booted Wed May 31 16:03:53 2023: 1 day, 5 hours, 40 minutes ago
Standby node boot Wed May 31 16:04:06 2023: 1 day, 5 hours, 40 minutes ago
Standby node last went not ready Wed May 31 16:07:06 2023: 1 day, 5 hours, 37 minutes
ago
Standby node last went ready Wed May 31 16:08:53 2023: 1 day, 5 hours, 35 minutes ago
Standby node last went not NSR-ready Wed May 31 16:06:49 2023: 1 day, 5 hours, 37 minutes
ago
Standby node last went NSR-ready Wed May 31 16:13:26 2023: 1 day, 5 hours, 30 minutes
ago
There have been 0 switch-overs since reload
Active node reload "User initiated chassis reload"
Standby node reload "User initiated chassis reload"
2. Perform the graceful shutdown of the MPA. Run the shutdown location location command in admin
EXEC mode, which gracefully shuts down MPA to prevent any of the file systems from being corrupted.
3. Verify that the MPA Status LED for the slot that you specified turns off. Also, you can verify that the
card is in the powered off state by running the show platform command.
4. To remove the MPA from the chassis, loosen the captive screws (marked as 1 in the image) on the MPA.
5. Press the tab down (marked as 2 in the image).
6. Pull the ejector lever away from the MPA (marked as 3 in the image).
7. Grasp the MPA and pull the MPA from the chassis (marked as 4 in the image). (You have already
disconnected the cables from the MPA.)
Figure 4: Remove an MPA
Press the tab down.2Rotate the captive screw to loosen the MPA.1
Pull the ejector lever away from the MPA.3
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Replace Chassis Components
Remove a Modular Port Adapter

8. Verify that the router is in the NSR-ready state. Use the show redundancy command as shown in the
following example:
Router#show redundancy
Thu Jun 1 21:52:36.811 UTC
Redundancy information for node 0/RP0/CPU0:
==========================================
Node 0/RP0/CPU0 is in ACTIVE role
Partner node (0/RP1/CPU0) is in STANDBY role
Standby node in 0/RP1/CPU0 is ready
Standby node in 0/RP1/CPU0 is NSR-ready
Reload and boot info
----------------------
RP reloaded Wed May 31 16:03:53 2023: 1 day, 5 hours, 48 minutes ago
Active node booted Wed May 31 16:03:53 2023: 1 day, 5 hours, 48 minutes ago
Standby node boot Wed May 31 16:04:06 2023: 1 day, 5 hours, 48 minutes ago
Standby node last went not ready Wed May 31 16:07:06 2023: 1 day, 5 hours, 45 minutes
ago
Standby node last went ready Wed May 31 16:08:53 2023: 1 day, 5 hours, 43 minutes ago
Standby node last went not NSR-ready Wed May 31 16:06:49 2023: 1 day, 5 hours, 45 minutes
ago
Standby node last went NSR-ready Wed May 31 16:13:26 2023: 1 day, 5 hours, 39 minutes
ago
There have been 0 switch-overs since reload
Active node reload "User initiated chassis reload"
Standby node reload "User initiated chassis reload"
9. Proceed with installing an MPA.
Install a Modular Port Adapter
This section provides step-by-step instructions for installing a modular port adapter (MPA) in a Cisco 8600
Series router.
After you remove the MPA from the slot, wait for 60 seconds before you reinsert an MPA.
Note
During this procedure, wear grounding wrist straps to avoid ESD damage to the card. Do not directly
touch the backplane with your hand or any metal tool, or you could shock yourself. Statement 94
Warning
To install an MPA, perform the following steps:
1. Ensure the router is in the NSR-ready state. Use the show redundancy command as shown in the following
example:
Router#show redundancy
Thu Jun 1 21:44:12.842 UTC
Redundancy information for node 0/RP0/CPU0:
==========================================
Node 0/RP0/CPU0 is in ACTIVE role
Partner node (0/RP1/CPU0) is in STANDBY role
Standby node in 0/RP1/CPU0 is ready
Standby node in 0/RP1/CPU0 is NSR-ready
Replace Chassis Components
8
Replace Chassis Components
Install a Modular Port Adapter

Reload and boot info
----------------------
RP reloaded Wed May 31 16:03:53 2023: 1 day, 5 hours, 40 minutes ago
Active node booted Wed May 31 16:03:53 2023: 1 day, 5 hours, 40 minutes ago
Standby node boot Wed May 31 16:04:06 2023: 1 day, 5 hours, 40 minutes ago
Standby node last went not ready Wed May 31 16:07:06 2023: 1 day, 5 hours, 37 minutes
ago
Standby node last went ready Wed May 31 16:08:53 2023: 1 day, 5 hours, 35 minutes ago
Standby node last went not NSR-ready Wed May 31 16:06:49 2023: 1 day, 5 hours, 37 minutes
ago
Standby node last went NSR-ready Wed May 31 16:13:26 2023: 1 day, 5 hours, 30 minutes
ago
There have been 0 switch-overs since reload
Active node reload "User initiated chassis reload"
Standby node reload "User initiated chassis reload"
2. To insert the MPA, locate the guide rails inside the chassis that hold the MPA in place.
3. Carefully slide the MPA all the way in the chassis until the MPA is firmly seated in the MPA interface
connector. When fully seated, the MPA might be slightly behind the faceplate.
The MPA will slide easily into the slot if it is properly aligned on the tracks. If the MPA does not slide easily,
do NOT force it. Remove the MPA and reposition it, paying close attention to engaging it on the tracks. Push
the MPA inside the slot until you hear a click. Continue to push the MPA further until you hear a second click.
The MPA is fully seated only after the second click is heard.
Note
4. After the MPA is properly seated, pull the ejector lever towards the chassis (marked as 2 in the image).
5. Pull the tab up (marked as 3 in the image).
6. Use a number 2 Phillips screwdriver to tighten the captive screws(marked as 4 in the image) on the MPA.
Figure 5: Install an MPA
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Replace Chassis Components
Install a Modular Port Adapter

Pull the ejector lever towards the MPA.2Slide the back end of the MPA into the open
MPA slot.
1
Rotate the captive screw to tighten the MPA.4Pull the tab up.3
Tighten the captive screws on the MPA within 10 seconds.
Note
Do not over-torque the MPA captive screws when installing the MPA. Tighten the captive screws on the MPA
to a torque of 9.7 in-lbs (1.09 N-m).
Note
7. Verify that after you've installed MPA, the router is in the NSR-ready state. Use the show redundancy
command as shown in the following example:
Router#show redundancy
Thu Jun 1 21:52:36.811 UTC
Redundancy information for node 0/RP0/CPU0:
==========================================
Node 0/RP0/CPU0 is in ACTIVE role
Partner node (0/RP1/CPU0) is in STANDBY role
Standby node in 0/RP1/CPU0 is ready
Standby node in 0/RP1/CPU0 is NSR-ready
Reload and boot info
----------------------
RP reloaded Wed May 31 16:03:53 2023: 1 day, 5 hours, 48 minutes ago
Active node booted Wed May 31 16:03:53 2023: 1 day, 5 hours, 48 minutes ago
Standby node boot Wed May 31 16:04:06 2023: 1 day, 5 hours, 48 minutes ago
Standby node last went not ready Wed May 31 16:07:06 2023: 1 day, 5 hours, 45 minutes
ago
Standby node last went ready Wed May 31 16:08:53 2023: 1 day, 5 hours, 43 minutes ago
Standby node last went not NSR-ready Wed May 31 16:06:49 2023: 1 day, 5 hours, 45 minutes
ago
Standby node last went NSR-ready Wed May 31 16:13:26 2023: 1 day, 5 hours, 39 minutes
ago
There have been 0 switch-overs since reload
Active node reload "User initiated chassis reload"
Standby node reload "User initiated chassis reload"
After you install an MPA, you can use the show interfaces command to verify the traffic on that MPA.
Note
Replace Chassis Components
10
Replace Chassis Components
Install a Modular Port Adapter

Replace a Switch Card
Statement 1090—Installation by Skilled Person
Only a skilled person should be allowed to install, replace, or service this equipment. See statement 1089 for
the definition of a skilled person.
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Statement 1091—Installation by an Instructed Person
Only an instructed person or skilled person should be allowed to install, replace, or service this equipment.
See statement 1089 for the definition of an instructed or skilled person.
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Statement 1073—No User-Serviceable Parts
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Statement 1029—Blank Faceplates and Cover Panels
Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages
and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other
equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all
cards, faceplates, front covers, and rear covers are in place.
Warning
Statement 1034—Backplane Voltage
Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when
servicing
Warning
Statement 1051—Laser Radiation
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or
view directly with optical instruments.
Warning
Before you begin:
Before replacing a Switch Card (SC), you must perform a graceful shutdown of the card to avoid disk corruption.
Use one of the following procedures to perform graceful shutdown of the card:
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11
Replace Chassis Components
Replace a Switch Card

• unscrew the captive screws and open ejector handles to trigger auto-shutdown of the card, and then verify
that the Status LED is in Off state.
• use the shutdown location location command in admin EXEC mode to shutdown the card. Then use
the show platform command to verify that the Status LED is in Off state.
The replacement procedure for the SC is only applicable to the standby SC card. Replacement of a standby
SC requires you to shutdown the router. When you shutdown the standby SC, the router automatically shuts
down the standby Route Processor (RP) card as both of them belong to the same operational domain. For
example, when you shutdown RP0, the router shuts down the corresponding SC0. When you shutdown RP1,
the router shuts down SC1. Similarly, when you reload RP1, the router reloads SC1. When you reload RP0,
the router reloads SC0.
Note
To replace the SC, you must do the following:
1. Shut down the SC being replaced. Use the shutdown location location command in admin EXEC mode,
which gracefully shuts down the SC module. Shutdown the RP-SC domain of the SC being replaced with
the location of the RP.
Or, unscrew the captive screws and open ejector handles to trigger auto-shutdown of the card, and then
verify that the Status LED is in Off state.
2. Verify that the SC Status LED for the slot that you specified turns off. Also, you can verify that the card
is in powered off state by running the show platform command.
3. Remove the SC. For more information, see Remove a Switch Card.
4. Install the new SC. For more information, see Install a Switch Card.
5. Reload the SC. To bring up the RP-SC domain to an operational state, reload the RP-SC domain by using
reload location location with the location of the RP.
6. Verify that the reloaded SC is again in the Operational state by using the show platform command.
To verify the mode of SC, if it is in standby or active mode, use the show platform domain command.
A fully loaded SC (with fans) weighs 27 lbs (12.25 kg). An empty SC (no fans) weighs 21.8 lbs (9.89 kg).
Caution
Remove a Switch Card
Before you begin
•You must wear an electrostatic discharge (ESD) wrist strap or other ESD protective device while handling
modules.
• Prepare an antistatic surface or packing materials for each module that you remove from the chassis.
Replace Chassis Components
12
Replace Chassis Components
Remove a Switch Card

Ensure to complete the SC replacement within 3 minutes as removing an SC also removes the fan modules.
We recommend that you remove or replace the SC and fan modules as a single unit to save the replacement
time.
Caution
Procedure
Step 1 If you are replacing an SC, open the packaging for the new module and inspect it for damage.
If the SC is damaged, contact your customer service representative and stop this replacement process until
you have an undamaged SC to install.
Step 2 Remove the SC that you are replacing by following these steps:
a) Loosen the captive screws on both sides of the SC. Wait for the Status LED to go in Off state.
b) Rotate the handles outwards until they stop (see Callout 2 in the following figure).
c) Use the ejector handles to pull the module a couple of inches (about 5 cm) out of the slot until it stops.
Hold the front of the SC with one hand and place your other hand under the SC to support
its weight.
Note
Figure 6: Remove Switch Card from Chassis
Rotate both ejector handles to the front of the
module. Pull on both handles to partially remove
the SC from the chassis
2Two captive screws (one on each handle)1
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13
Replace Chassis Components
Remove a Switch Card

Figure 7: Pull Switch Card from Chassis
Pull on both ejector handles to partially remove the SC from the chassis1
d) Close the ejector handles and tighten the captive screws to 9.7 in-lbs (1.09 N-m) of torque.
e) Pull the module out of the slot.
Use caution when handling the SC. A fully loaded SC (with fans) weighs 27 lbs (12.25 kg).
An empty SC (no fans) weighs 21.8 lbs (9.89 kg).
Caution
f) Place the SC on an antistatic surface or in an antistatic bag.
Install a Switch Card
Ensure to complete the Switch Card replacement within 3 minutes as removing an SC also removes the fan
modules.
We recommend that you remove or replace the SC and fan modules as a single unit to save the replacement
time.
Caution
Procedure
Step 1 Unscrew the two captive screws (one on each ejector handle) and rotate the ejector handles until it stops.
Step 2 Slide the SC into the slot until it stops.
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14
Replace Chassis Components
Install a Switch Card

Step 3 Close the ejector levers.
Ensure to close both the ejector levers at the same time so that the SC sits properly in the SC slot.
Attention
Step 4 Tighten the captive screw on each side of the SC to 9.7 in-lbs (1.09 N-m) of torque.
Step 5 Reinstall the fan modules into the SC.
Refer to installing the fan tray procedure: Replace a Fan Module, on page 17
Tighten the captive screws on the SC within 10 seconds. If you can't replace an SC within three
minutes, we recommend that you leave the SC in the chassis until you are ready to replace it.
Note
Replace a Fan Spinner
The following sections describe how to remove or install a Fan Spinner:
Remove a Fan Spinner
•You must wear an electrostatic discharge (ESD) wrist strap or other ESD protective device while handling
modules.
• Prepare an antistatic surface or packing materials for each module that you remove from the chassis.
Ensure to complete the Fan Spinner replacement within 3 minutes as removing a Fan Spinner also removes
the fan modules.
We recommend that you remove or replace the Fan Spinner and fan modules as a single unit to save the
replacement time.
Caution
1. If you are replacing a Fan Spinner, open the packaging for the new module and inspect it for damage.
If the Fan Spinner is damaged, contact your customer service representative and stop this replacement process
until you have an undamaged Fan Spinner to install.
Note
2. Remove the Fan Spinner that you are replacing by following these steps:
a. Loosen the captive screws on both sides of the Fan Spinner.
b. Rotate the handles outwards until they stop (see Callout 2 in the following figure).
c. Use the ejector handles to pull the module a couple of inches (about 5 cm) out of the slot until it stops.
Hold the front of the Fan Spinner with one hand and place your other hand under the Fan Spinner to support
its weight.
Note
Replace Chassis Components
15
Replace Chassis Components
Replace a Fan Spinner

Figure 8: Remove Fan Spinner from Chassis
Rotate both ejector handles to the front of the
module. Pull on both handles to partially
remove the Fan Spinner from the chassis
2Two captive screws (one on each handle)1
Figure 9: Pull Fan Spinner from Chassis
Pull on both ejector handles to partially remove the Fan Spinner from the chassis1
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Replace Chassis Components
Remove a Fan Spinner

d. Close the ejector handles and tighten the captive screws.
e. Pull the module out of the slot.
Use caution when handling the Fan Spinner. A fully loaded Fan Spinner (with fans) weighs 17.5 lbs (7.94
kg). An empty Fan Spinner (no fans) weighs 12.3 lbs (5.58 kg).
Caution
f. Place the Fan Spinner on an antistatic surface or in an antistatic bag.
Install a Fan Spinner
Ensure to complete the Fan Spinner replacement within 3 minutes as removing a Fan Spinner also removes
the fan modules.
We recommend that you remove or replace the Fan Spinner and fan modules as a single unit to save the
replacement time.
Caution
1. Unscrew the two captive screws (one on each ejector handle) and rotate the ejector handles until it stops.
2. Slide the Fan Spinner into the slot until it stops.
3. Close the ejector levers.
Ensure to close both the ejector levers at the same time so that the Fan Spinner sits properly in the slot.
Attention
4. Tighten the captive screw on each side of the Fan Spinner to 9.7 in-lbs (1.09 N-m) of torque.
5. Reinstall the fan modules into the Fan Spinner.
Refer to installing the fan tray procedure: Replace a Fan Module, on page 17
Tighten the captive screws on the Fan Spinner within 10 seconds. If you can't replace an Fan Spinner within
three minutes, we recommend that you leave the Fan Spinner in the chassis until you are ready to replace it.
Note
Replace a Fan Module
The Cisco 8608 router uses eight fan modules (8608-FAN) but it can operate with seven fan modules while
you replace one. When you remove one fan module, the other fan modules speed up their fans to maintain
the designed airflow.
The fan module is designed to be removed and replaced while the system is operating without presenting an
electrical hazard or damage to the system. Please keep the replacement fan modules ready prior to attempting
this task.
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17
Replace Chassis Components
Install a Fan Spinner

To ensure adequate airflow and prevent overheating, do not operate the router with seven fan modules for
more than 10 minutes.
If you cannot replace a fan module within three minutes, we recommend that you leave it in the chassis until
you are ready to replace it.
Note
Never remove two fan modules at a time during operation. The router allows up to two minutes of operations
before shutting down unless you replace the missing fan module within that time. If the router senses an over
temperature condition when multiple fan modules are removed, the shutdown can occur in fewer than two
minutes.
Caution
Statement 1090—Installation by Skilled Person
Only a skilled person should be allowed to install, replace, or service this equipment. See statement 1089 for
the definition of a skilled person.
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Statement 1091—Installation by an Instructed Person
Only an instructed person or skilled person should be allowed to install, replace, or service this equipment.
See statement 1089 for the definition of an instructed or skilled person.
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Statement 1073—No User-Serviceable Parts
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Statement 1029—Blank Faceplates and Cover Panels
Blank faceplates and cover panels serve three important functions: they prevent exposure to hazardous voltages
and currents inside the chassis; they contain electromagnetic interference (EMI) that might disrupt other
equipment; and they direct the flow of cooling air through the chassis. Do not operate the system unless all
cards, faceplates, front covers, and rear covers are in place.
Warning
Statement 1034—Backplane Voltage
Hazardous voltage or energy is present on the backplane when the system is operating. Use caution when
servicing
Warning
Replace Chassis Components
18
Replace Chassis Components
Replace a Fan Module

Statement 1051—Laser Radiation
Invisible laser radiation may be emitted from disconnected fibers or connectors. Do not stare into beams or
view directly with optical instruments.
Warning
Figure 10: Cisco 8608 Router - Replace Fans
To replace a fan tray, you must perform the following functions:
1. Press the latch to remove the fan to be replaced.
2. Hold the fan module with the LED and PID label at the top.
3. Align the fan module to the open fan slot in the chassis and press the module all the way into the slot until
the front of the fan module touches the chassis.
Ensure that the thumbscrew on the fan module is aligned with the screw hole in the chassis.
4. If the chassis is powered on, listen for the fans. You should immediately hear them operating. If you do
not hear them, ensure that the fan module is inserted completely in the chassis.
5. Verify that the fan module LED is green. If the LED is not green, one or more fans are faulty. If this
situation occurs, contact your customer service representative for replacement parts.
Replace Chassis Components
19
Replace Chassis Components
Replace a Fan Module

Replace Power Modules
The following sections describe how to remove or install power modules:
Removing an AC Power Supply Unit
To remove an AC Power Supply Unit (PSU), follow the steps described here.
Before you begin
Statement 1073—No User-Serviceable Parts
There are no serviceable parts inside. To avoid risk of electric shock, do not open.
Warning
Procedure
Step 1 Set the AC-input power supply rocker switch to the OFF (0) position
Figure 11: AC Power Supply Switch Position
Power supply in the OFF (0) position1
Step 2 Loosen and remove the retainer strip that is around the power cord.
See Power Cord Retainer Mechanism.
Step 3 Remove the power cord from AC-in receptacle.
Replace Chassis Components
20
Replace Chassis Components
Replace Power Modules