Control Board (CB) Installation Instructions Part No. 530-008051-01 Revision 1 8 July 2002
This document describes how to remove and replace a Control Board (CB) on a Juniper Networks T320 Internet router and a T640 Internet routing node. For additional installation and configuration information, refer to the following documentation: T320 Internet Router Hardware Guide T640 Internet Routing Node Hardware Guide JUNOS Internet Software Operational Mode Command Reference JUNOS Internet software configuration guides
Contents
CB Description ....................................................................................................... 1 CB Components .............................................................................................. 2 Tools and Parts Required ....................................................................................... 2 Take the Host Subsystem Offline ........................................................................... 3 Replace a CB .......................................................................................................... 3 Remove a CB .................................................................................................. 4 Install a Replacement CB ................................................................................ 4 Verify That the CB Is Installed Correctly .......................................................... 5 Contact Juniper Networks....................................................................................... 5
CB Description Each Control Board (CB) works with an adjacent Routing Engine to provide control and monitoring functions for the system (see Figure 1). These include determining Routing Engine mastership, controlling power, reset and SONET clocking for the other system components, monitoring and controlling fan speed, and monitoring system status using I2C controllers. You can install one or two CBs in the chassis. The CBs install into the upper rear of the chassis in the slots labeled CBO and CB1. If two CBs are installed, one functions as master and the other acts as backup. If the master CB fails or is removed, the backup restarts and becomes master. The CBs are hot-pluggable. Each CB requires a Routing Engine to be installed in the adjacent slot. CB0 installs above RE0, and CB1 installs below RE1. A CB does not function if no Routing Engine is present in the adjacent slot.
Control Board (CB) Installation Instructions
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Tools and Parts Required
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Figure 1: CB
Extractor clip
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Online/offline button LEDs Ethernet port
Extractor clip
CB Components Each CB consists of the following components: 16-port 100-MB Ethernet switch for intermodule communication. PCI bus to the Routing Engines. Processor subsystem (SPMB). Three LEDs, located on the CB faceplate, indicate the status of the CB. Table 1 describes the functions of the CB LEDs. CB online/offline button, located on the CB faceplate.
Table 1: CB LEDs Label
Color
State
Description
OK
Green
On steadily
CB is online and is functioning normally.
FAIL
Amber
On steadily
CB has failed.
MASTER
Blue
On steadily
CB is functioning as master.
Tools and Parts Required Phillips (+) screwdrivers, numbers 1 and 2 Electrostatic bags, one for each component removed Antistatic mat
Control Board (CB) Installation Instructions
Take the Host Subsystem Offline
ESD grounding wrist strap Replacement components or blank panels, one for each component removed
Take the Host Subsystem Offline The host subsystem is taken offline and brought online as a unit. Before you replace a Routing Engine or a CB, you take the host subsystem offline. The host subsystem is hot-pluggable. Normally, if two host subsystems are installed in the chassis, HOST0 functions as the master and HOST1 functions as the backup. You can remove the backup host subsystem (or either of its components) without interrupting the functioning of the platform. If you take the master host subsystem offline, the platform reboots and the backup host subsystem becomes master. If the platform has only one host subsystem, taking the host subsystem offline causes the platform to shut down. To take a host subsystem offline, follow this procedure: 1.
Determine whether the host subsystem is functioning as master or as backup, using one of the two following methods:
Check the host subsystem LEDs on the craft interface. If the green MASTER LED is lit, the corresponding host subsystem is functioning as master.
Display which host subsystem is functioning as master, using the CLI command: user@host> show chassis routing-engine
2.
If the host subsystem is functioning as master, switch it to backup, using the CLI command: user@host> request chassis routing-engine master switch
When you switch the host subsystem from master to backup, the functioning of the platform is interrupted for up to several minutes as the system reboots and the new master host subsystem downloads software to the SIBs.
Replace a CB To replace a CB, use the following procedures: Remove a CB on page 4 Install a Replacement CB on page 4 Verify That the CB Is Installed Correctly on page 5
Control Board (CB) Installation Instructions
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Replace a CB
4
Remove a CB The chassis can have one or two CBs. They are located in the upper rear of the chassis in the slots marked CB0 and CB1. Each CB weighs approximately 5 lb (2.3 kg). To remove a CB, follow this procedure (see Figure 2): 1.
Have ready an antistatic mat, placed on a flat, stable surface.
2.
Attach an ESD wrist strap to your bare wrist, and connect the wrist strap to one of the ESD points on the chassis.
3.
Check whether the CB is functioning as backup or as master. If necessary, take the host subsystem offline.
4.
Loosen the captive screws on the ejector handles on both sides of the CB faceplate.
5.
Flip the ejector handles outwards to unseat the CB.
6.
Grasp the ejector handles and slide the CB about halfway out of the chassis.
7.
Move one of your hands underneath the CB to support it, and slide it completely out of the chassis.
Figure 2: Remove a CB
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Install a Replacement CB To install a replacement CB, follow this procedure (see Figure 3): 1.
Attach an ESD wrist strap to your bare wrist, and connect the wrist strap to one of the ESD points on the chassis.
2.
Remove the replacement CB from its electrostatic bag.
3.
Carefully align the sides of the CB with the guides inside the chassis.
Control Board (CB) Installation Instructions
Contact Juniper Networks
4.
Slide the CB all the way into the chassis.
5.
Grasp both ejector handles and press them inwards to seat the CB.
6.
Tighten the captive screws on the ejector handles.
7.
To bring the CB online, press the online/offline button until the green ONLINE LED lights.
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Figure 3: Install a Replacement CB
Verify That the CB Is Installed Correctly To verify that the CB is functioning normally, check the LEDs on its faceplate. The green ONLINE LED should light steadily. To check the status of the CB, use the CLI command: user@host> show chassis environment cb
Contact Juniper Networks For technical support, contact Juniper Networks at
[email protected], or at 1-888-314-JTAC (within the United States) or 408-745-2121 (from outside the United States).
Copyright © 2002, Juniper Networks, Inc. All rights reserved. Juniper Networks is registered in the U.S. Patent and Trademark Office and in other countries as a trademark of Juniper Networks, Inc. Broadband Cable Processor, G10, Internet Processor, JUNOS, JUNOScript, M5, M10, M20, M40, M40e, M160, M-series, T320, T640, and T-series are trademarks of Juniper Networks, Inc. All other trademarks, service marks, registered trademarks, or registered service marks are the property of their respective owners. All specifications are subject to change without notice. Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice.
Control Board (CB) Installation Instructions
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Contact Juniper Networks
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Control Board (CB) Installation Instructions
