Table Of Contents
Installing EMI Gaskets and RF Absorber Material on the Cisco uBR10012 Universal Broadband Router
First Published: December 28, 2004Last Updated: June 3, 2013
This document describes how to install EMI gaskets and RF absorber material on the Cisco uBR10012 universal broadband router before you install the performance routing engine (PRE) modules.
Before You Begin
Verify that you need this upgrade. Check the locations in Figure 1 for installed EMI gaskets and RF absorber material. If you already have the EMI gaskets and RF absorber material installed, you do not need to continue with this procedure and you can continue with the installation of the PRE modules.
Document Revision History
Upgrading to a PRE module in the Cisco uBR10012 router might result in unacceptable Cisco manufacturing EMI emission margins. By installing EMI gaskets and RF absorber material in the locations specified, an acceptable margin is met.
Note This condition is not harmful to the PRE modules or the Cisco uBR10012 router.
Figure 1 Locations of EMI Gaskets and RF Absorber Material
Preparing the Chassis
•ESD-preventive wrist strap, antistatic bags, and an antistatic surface
•EMI gaskets and RF absorber material kit
•PRE2 modules to replace the PRE1 modules.
To prepare the chassis for installation of the EMI gaskets and RF absorber material, do the following:
Step 1 Make sure you are properly grounded.
Step 2 Power down the router.
Step 3 Remove the existing PRE modules from the chassis and place them on an antistatic surface.
Step 4 Loosen the captive screws and pivot the ejector levers away from the modules.
Step 5 Slide the PRE modules out of the chassis and place them in antistatic bags.
Installing the EMI Gasket on the Chassis Sidewall
An EMI gasket (51-6555-01) must be installed on the center of the chassis sidewall. (See Figure 2.)
Figure 2 EMI Gasket on the Chassis Sidewall
To attach the EMI gasket to the chassis sidewall, perform the following steps:
Step 1 Peel the adhesive backing off the gasket.
Step 2 Align the sticky side of the gasket to the center of the chassis sidewall and attach it firmly next to the current line card 8/0 EMI gasket. (See Figure 2.)
Installing the EMI Gaskets on the Fan Module
The EMI gaskets are installed on the chassis on either side of the fan module. See Figure 3. This procedure should take 2 to 3 minutes.
Note EMI gaskets are only required if you are replacing PRE1 modules with PRE2 modules in a Cisco uBR10012 universal broadband router.
Figure 3 Installation Location of the EMI Gaskets
To install the EMI gaskets on the fan module, perform the following steps:
Step 1 Loosen the captive screws on the fan module and pull the fan module out of the chassis far enough so that you can install the EMI gaskets. You do not need to remove the fan module from the chassis.
Step 2 With a clean wipe, wipe off the left and right flanges where the four EMI gaskets will be installed.
Step 3 Peel the backing off the gasket (only prepare one gasket at a time).
Step 4 Align the sticky side of the gasket with the flange so that the end of the gasket is level with the top of the flange, see Figure 4.
Figure 4 Aligning the EMI Gasket
Step 5 Carefully place the EMI gasket on the flange and press down to secure the gasket in place.
Caution Do not let the let the gasket slip to either side of the flange. Maintain a distance of at least one-half inch around the captive screw hole in the flange.
Step 6 Peel the backing off the bottom EMI gasket and align the end of the gasket with the bottom of the flange. See Figure 4.
Step 7 Carefully place the gasket on the flange and press down to secure the gasket in place.
Figure 5 Installed EMI Gaskets
Step 9 Push the fan module back into the chassis and use the captive screws to secure the fan module in place. Note that the EMI gaskets are compressed when securing the fan to the chassis. See Figure 5.
Installing the RF Absorber Material
RF absorber material is required when you are installing PRE2 modules in your Cisco uBR100012 router. The absorber material is placed on the inside panel of PRE slot B. This procedure should take 4 to 5 minutes.
To install the RF absorber material, do the following:
Step 1 Make sure you are properly grounded.
Step 2 Remove both PRE1 modules from the chassis, if you have not already done so.
Step 3 Using a clean lint-free wipe, wipe the inside panel of the PRE module slot B (panel next to the power supplies). Make sure that the edge of the lip and the edge along the raised channel are free of any dust or debris. See Figure 6.
Caution If the RF absorber material is bubbled or marred by debris left on the surface of the panel or on the lip at the bottom, the PRE2 module may catch on the RF absorber material and not fit properly into the slot.
Figure 6 Aligning the RF Absorber Material with the Raised Channel and Lip
Step 4 Peel the backing from the 2.7 x14.2 inch sheet of RF absorber material. Be very careful not to let any two adhesive covered sections of the material stick together, it is very difficult to unstick.
Step 5 Carefully align the material in the area shown in Figure 6. When you are aligning the material, align it with both the edge of the raised channel and the edge of the lip.
Caution Take special care to properly align this material before securing it in place, the material is difficult to remove once it is securely in place.
Do not allow the RF absorber material to over lap the raised channel or the lip as it can interfere with the PRE2 installation.
Step 6 Lightly press the RF absorber material into place along the raised channel, making sure that there are no bubbles or wrinkles in the material.
Note You can lift the RF absorber material from the panel to reposition it, but each time you do, the adhesive backing loses some of its integrity.
Figure 7 Aligning the RF Absorber Material
Step 7 When the material is properly aligned and laying flat against the surface of the panel, gently press down on the material, starting from the side nearest the raised channel and moving toward the back of the chassis.
Make sure that you don't cause the material to slip out of place and check for any wrinkles or bubbles. Reset the RF absorber material, if necessary.
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