Installing Air Circulation Components

Installing and Upgrading Air Circulation Components

This chapter provides instructions on how to install and upgrade the Cisco CRS 8-Slot Line Card Chassis Enhanced router air circulation components.

This chapter presents the following topics:

About Line Card Chassis Airflow

The Cisco CRS 8-Slot Line Card Chassis Enhanced router has two fan trays, each with four fans, that cool the chassis card cages.

The top fan pulls air into the lower portion of the front of the chassis, up across the cards in the front of the chassis, and through the upper fan tray. Air flows out of the upper fan tray and down across all the modular service cards and switch fabric cards through the lower fan tray; air is then exhausted out the bottom of the rear of the chassis (see Figure 1).

In addition, each AC or DC power module at the bottom of the chassis has self-contained fans that pull in cool air from the front of the chassis and exhaust the warm air out the rear of the chassis.

A replaceable air filter is located on the front of the chassis below the PLIM card cage. How often the air filters should be replaced depends on the facility environment. In a dirty environment, or when you start getting frequent temperature alarms, you should always check the intake grills for debris, and then check the air filters to see if they need to be replaced.


Note
We recommend that you check the air filters once a month. Replace a filter when you notice a significant amount of dust.
Figure 1. Airflow Through the Cisco CRS 8-Slot Line Card Chassis Enhanced Router

The Cisco CRS 8-Slot Line Card Chassis Enhanced router airflow volumes are:

  • Chassis airflow: Up to 1000 cubic feet (28, 317liters) per minute
  • Power system airflow: Up to 240 cubic feet (6,800 liters) per minute

Installing Air Circulation Components

This section contains the following procedures:

Installing a Lower Fan Tray

This section describes how to install a fan tray (if applicable) in the lower fan tray slot of the Cisco CRS 8-Slot Line Card Chassis Enhanced router. For information on the chassis airflow and circulation, see About Line Card Chassis Airflow.

A Cisco CRS 8-Slot Line Card Chassis Enhanced router fan tray operates in either the upper or lower fan tray slot. Each fan tray installs into the rear (MSC) side of the chassis . Each fan tray contains four fans.

Figure 2. Fan Tray

1

Captive screws

3

Fan tray handle

2

Fan tray rail

Prerequisites

Before performing this task, remove the optional rear exhaust grille, if installed.

Required Tools and Equipment

You need the following tools and part to perform this task:

  • ESD-preventive wrist strap
  • Number 2 Phillips screwdriver
  • Fan tray
Steps

To install a lower fan tray, follow these steps:

Procedure
    Step 1   Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the rear (MSC) side of the chassis or a bare metal surface on the chassis.
    Step 2   Using two hands to support the fan tray, position it in front of the fan tray bay so that the rails on the sides of the fan tray are aligned with the rail guides on the interior of the chassis.
    Caution   

    A fan tray weighs approximately 19.15 pounds (8.69 kg). Use both hands when handling a fan tray.

    Caution   

    Do not set the fan tray down on the connector; doing so could damage it.

    Step 3   Slide the fan tray all the way in. Press it firmly into the chassis so that the connector on the back of the fan tray is seated firmly against the connector on the interior of the chassis.
    Caution   

    To prevent damage to the chassis connector, do not use excessive force when inserting a fan tray into its bay.

    Step 4   Using the Number 2 Phillips screwdriver, tighten the two captive screws (one for each side).
    Note    All electrical and control line connections are made automatically when the connectors mate.
    What to Do Next

    After performing this task, reinstall the optional rear exhaust grille, if applicable.

    Installing the Chassis Air Filter

    This section describes how to install (if applicable) the air filter in the Cisco CRS 8-Slot Line Card Chassis Enhanced router. For further information, see About Line Card Chassis Airflow.

    The chassis has a serviceable air filter mounted in a slide-out tray, accessible from the rear of the chassis just above the lower fan tray. The Cisco CRS 8-Slot Line Card Chassis Enhanced router air filter plugs into the front (PLIM) side of the chassis .

    Figure 3. Chassis Air Filter

    1

    Air filter cover plate (with captive screws)

    2

    Chassis air filter

    Prerequisites

    Before performing this task, you must first remove the front cover and inlet grille, if installed.


    Caution

    Never operate the Cisco CRS 8-Slot Line Card Chassis Enhanced router without an air filter. Doing so can damage the hardware.

    Required Tools and Equipment

    You need the following tools and part to perform this task:

    • ESD-preventive wrist strap
    • Number 2 Phillips screwdriver
    • Chassis air filter
    Steps

    To install the chassis air filter, follow these steps:

    Procedure
      Step 1   Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the front (PLIM) side of the chassis or a bare metal surface on the chassis.
      Step 2   Using two hands to support the air filter, orient it so that the ridge on the front of the air filter faces outward from the front of the chassis and the wire-grid backing support is facing up.
      Step 3   Slide the air filter into the air filter slot until it is seated fully within the slot.
      Step 4   Hold the air filter cover plate in place and using a Number 2 Phillips screwdriver, tighten the two captive screws on the front of the plate.
      What to Do Next

      After performing this task, reinstall the inlet grill and the front cover, if applicable.

      Installing a Rear Exhaust Grille

      This section describes how to install a rear exhaust grille on the Cisco CRS 8-Slot Line Card Chassis Enhanced router.

      Prerequisites

      There are no prerequisites for this task.

      Required Tools and Equipment

      You need the following tools and part to perform this task:

      • ESD-preventive wrist strap
      • Number 2 Phillips screwdriver
      • Rear exhaust grille
      Steps

      To install a rear exhaust grille, follow these steps:

      Figure 4. Installing Rear Exhaust Grille

      1

      Rear exhaust grille

      Procedure
        Step 1   Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the rear (MSC) side of the chassis or a bare metal surface on the chassis.
        Step 2   Attach the rear exhaust grille to the rear of the chassis using the five panel fasteners. Tighten the three screws on top with a # 2 Phillips screwdriver. Hand-tighten the two screws on the side.

        Installing an Upper Fan Tray

        This section describes how to install a fan tray in the upper fan tray slot of the Cisco CRS 8-Slot Line Card Chassis Enhanced router. For information on the chassis airflow and circulation, see c_​About_​Line_​Card_​Chassis_​Airflow_​1041304.xml#con_​1041304.

        A Cisco CRS 8-Slot Line Card Chassis Enhanced router fan tray operates in either the upper or lower fan tray slot. Each fan tray installs into the rear (MSC) side of the chassis (see #con_1028849/​fig_​1041545).

        Prerequisites

        There are no prerequisites for this task.

        Required Tools and Equipment

        You need the following tools and parts to perform this task:

        • ESD-preventive wrist strap
        • Number 2 Phillips screwdriver
        • Fan tray
        Steps

        To install an upper fan tray, follow these steps:

        Procedure
          Step 1   Attach the ESD-preventive wrist strap to your wrist and connect its leash to one of the ESD connection sockets on the rear (MSC) side of the chassis or a bare metal surface on the chassis.
          Step 2   Using the screwdriver, unscrew the two captive screws holding the fan tray bay door in place.
          Step 3   Lift the door up; you may need a second person to hold it in the open position.
          Step 4   Using two hands to support the fan tray, position it in front of the fan tray bay so that the rails on the sides of the fan tray are aligned with the rail guides on the interior of the chassis.
          Caution   

          A fan tray weighs approximately 19.15 pounds (8.69 kg). Use both hands when handling a fan tray.

          Step 5   Slide the fan tray into the fan tray bay. Stop when the fan tray meets the chassis connector in the back of the fan tray bay.

          Notice that the tray (and rail guides) drop just inside the fan tray bay door, so that the fan tray “drops” into its final position as it gets almost all the way into the chassis.

          Caution   

          To prevent damage to the chassis connector, do not use excessive force when inserting a fan tray into its bay.

          Step 6   Firmly push on the fan tray to seat the fan tray connector in the chassis connector.
          Note    All electrical and control line connections are made automatically when the connectors mate.
          Step 7   Lower the fan tray bay door and tighten the two captive screws on the fan tray bay door.

          Upgrading Fan Trays-Summary Steps


          Note
          The new fan trays (CRS-8-FANTRAY-B) are only supported if you are using Cisco IOS-XR release 4.3.2 or later.

          The following section describes how to upgrade upper and lower legacy fan trays (CRS-8-LCC-FAN-TR) to the new fan trays (CRS-8-FANTRAY-B). This section covers the following topics:


          Note
          You can use either the legacy or the new fan trays in the Cisco CRS 8-Slot Line Card Chassis Enhanced router. A mix of fan trays is not a supported mode of operation. Such a mode is temporarily allowed only during the fan tray upgrade.

          Prerequisites

          The upgrading process is slightly different, depending upon which Cisco IOS-XR release you are using.

          Required Tools and Equipment

          You need the following tools to perform this task:

          • ESD-preventive wrist strap
          • Large Phillips screwdriver
          • Upper and lower fan trays (CRS-8-FANTRAY-B)

          Summary Steps

          Procedure
            Step 1   Shut down the envmon and envmon_mon processes.
            Note    Since this is a hot swap, make sure to have the new fan trays readily available. Once you remove a legacy fan tray, insert the new fan tray immediately, making sure to seat it firmly against its connector.
            Step 2   Replace the upper fan tray with the new fan tray.
            Step 3   Replace the lower fan tray with the new fan tray.
            Step 4   Start the envmon and envmon_mon processes again.
            Step 5   Wait for 20 seconds, then restart the invmgr process.

            Upgrading Fan Trays-Detailed Steps

            Procedure
               Command or ActionPurpose
              Step 1 process mandatory off envmon


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process mandatory off envmon
               

              Sets the mandatory reboot options for the envmon process.

               
              Step 2 process shutdown envmon


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process shutdown envmon
               

              Terminates the envmon process.

               
              Step 3process mandatory off envmon_mon


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process mandatory off envmon_mon
               

              Sets the mandatory reboot options for the envmon_mon process.

               
              Step 4process shutdown envmon_mon


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process shutdown envmon_mon
               

              Terminates the envmon_mon process.

               
              Step 5 Remove the upper legacy fan tray and install the new upper fan tray.  
              Note    Since this is a hot swap, make sure to have the new fan tray readily available. Once you remove the legacy fan tray, insert the new fan tray immediately, making sure to seat it firmly against its connector.

              Inserts the new upper fan tray. LEDs on the new fan tray glow green upon insertion. (Green and amber may be observed for a short duration.)

               
              Step 6 Remove the lower legacy fan tray and install the new lower fan tray.  
              Note    Since this is a hot swap, make sure to have the new fan tray readily available. Once you remove the legacy fan tray, insert the new fan tray immediately, making sure to seat it firmly against its connector.

              Inserts the new lower fan tray. LEDs on the new fan tray glow green upon insertion. (Green and amber may be observed for a short duration.)

               
              Step 7process start envmon


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process start envmon
               

              Starts the envmon process back up, which detects the new fan trays.

               
              Step 8process start envmon_mon


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process start envmon_mon
               

              Starts the envmon_mon process back up, which detects the new fan trays.

               
              Step 9process restart invmgr


              Example: 
              RP/0/RP0/CPU0:ios(admin)#process restart invmgr
               

              Wait for 20 seconds, then restart the invmgr process.

               
              Step 10 process mandatory on envmon_mon

              Example: 
              RP/0/RP0/CPU0:ios(admin)#process mandatory on envmon_mon
               

              Reset the mandatory reboot options for the envmon_mon process.

               
              Step 11 process mandatory on envmon

              Example: 
              RP/0/RP0/CPU0:ios(admin)#process mandatory on envmon
               

              Reset the mandatory reboot options for the envmon process.

               
              Verifying the Fan Tray

              To verify which fan tray is installed, run the following commands:

              • admin show diag fans
              • admin show inventory fans
              Example of admin show diag fans for new fan trays
              RP/0/RP0/CPU0:ios#admin show diag fans
Rack 0 - Fan Tray 0 (Upper): CRS 8 Slots Fan Tray for CRS-8/S-B
  MAIN:  board type 900163
         800-39053-01 rev 05
         dev N/A
         S/N FLAM16370WNU
  PCA:   73-14855-01 rev 05
  PID:   CRS-8-FANTRAY-B
  VID:   V00
  CLEI:
  ECI:   0
Rack 0 - Fan Tray 1 (Lower): CRS 8 Slots Fan Tray for CRS-8/S-B
  MAIN:  board type 900163
         800-39053-01 rev 05
         dev N/A
         S/N FLM17035W2A
  PCA:   73-14855-01 rev 05
  PID:   CRS-8-FANTRAY-B
  VID:   V00
  CLEI:
  ECI:   0
              Example of admin show diag fans for legacy fan trays
              RP/0/RP0/CPU0:ios#admin show diag fans
Rack 0 - Fan Tray 0 (Upper): Cisco CRS-1 Series Fan Tray for 8 slots LCC
  MAIN:  board type 900160
         800-23275-09 rev D0
         dev N/A
         S/N TBM16492777
  PCA:   73-8701-06 rev A0
  PID:   CRS-8-LCC-FAN-TR
  VID:   V05
  CLEI:  IPPQAH1JAA
  ECI:   155763
Rack 0 - Fan Tray 1 (Lower): Cisco CRS-1 Series Fan Tray for 8 slots LCC
  MAIN:  board type 900160
         800-23275-09 rev D0
         dev N/A
         S/N TBM16492767
  PCA:   73-8701-06 rev A0
  PID:   CRS-8-LCC-FAN-TR
  VID:   V05
  CLEI:  IPPQAH1JAA
  ECI:   155763
              Example of admin show inventory fans for new fan trays
              RP/0/RP0/CPU0:ios#admin show inventory fans
NAME: "Rack 0 - Fan Tray Upper", DESCR: "CRS 8 Slots Fan Tray for CRS-8/S-B"
PID: CRS-8-FANTRAY-B, VID: V00, SN: FLAM16370WNU
NAME: "Rack 0 - Fan Tray Lower", DESCR: "CRS 8 Slots Fan Tray for CRS-8/S-B"
PID: CRS-8-FANTRAY-B, VID: V00, SN: FLM17035W2A
              Example of admin show inventory fans for legacy fan trays
              RP/0/RP0/CPU0:ios#admin show inventory fans
NAME: "Rack 0 - Fan Tray Upper", DESCR: "Cisco CRS-1 Series Fan Tray for 8 slots LCC"
PID: CRS-8-LCC-FAN-TR, VID: V05, SN: TBM16492777
NAME: "Rack 0 - Fan Tray Lower", DESCR: "Cisco CRS-1 Series Fan Tray for 8 slots LCC"
PID: CRS-8-LCC-FAN-TR, VID: V05, SN: TBM16492767