Installing or Replacing the DRAM SIMM
in Cisco 1600 Series Routers

Removing the Router Cover

Take the following steps to remove the router cover:

Step 1 Turn OFF the power by pressing the power switch on the rear panel to the off ( O ) position.

Step 2 Disconnect all cables from the rear panel.

Step 3 Place the router upside down a flat, secure surface, such as a desk or table.

Step 4 Using the Phillips screwdriver, remove the screw at the center of the underside of the router, as shown in Figure 1. Put the screw in a safe place.

Figure 1 : Removing the Screw from the Bottom of the Router

Step 5 Using both hands to hold the top and bottom of the router together, turn the router over so that it is right side up on the flat surface and the rear panel is facing toward you.

Step 6 Using the Phillips screwdriver, remove the two screws from the rear panel of the router, as shown in Figure 2. Put the screws in a safe place.

Figure 2 : Removing the Screws from the Rear Panel

Step 7 Turn the router so that the rear panel is facing away from you, then use one hand to hold the bottom half of the router in place on the flat surface, as shown in Figure 3.

Step 8 Place the other hand on top of the router. With your fingers, grasp the lip of the cover that hangs over the rear panel of the router and gently pull the cover up and away from the bottom section of the router. (See Figure 3.)

Set the router cover in a safe place.

Figure 3 : Removing the Router Cover

Proceed with the next section, "Installing or Replacing the DRAM SIMM."

Installing or Replacing the DRAM SIMM

Take the following steps to install or replace the DRAM SIMM:

Step 1 If the router has a DRAM SIMM already installed, locate it on the system card. With the rear panel of the router facing you, the DRAM SIMM is located in the upper left corner of the system card, as shown in Figure 4. If there is no DRAM SIMM installed the router, proceed to Step 3 to install a DRAM SIMM in the location shown in Figure 4.

Figure 4 : DRAM SIMM Location---Cisco 1600 Series Routers

Step 2 Remove any existing DRAM SIMM. While pulling outward on the tabs to unlatch them, raise the SIMM to the vertical position and remove it from the SIMM socket. (See Figure 5.)

Caution To prevent damage, do not push on the center of the DRAM SIMM. Handle the DRAM SIMM carefully.

Figure 5 : Replacing the DRAM SIMM

Step 3 With the rear panel of the router still facing you, position the new DRAM SIMM so that the polarization notch is located at the right end of the SIMM socket.

Caution To prevent damage, note that some DRAM SIMMs have the components mounted on the rear side; therefore, when you insert the SIMM, always use the polarization notch as a reference, not the position of the components on the SIMM.

Step 4 Insert the new DRAM SIMM by sliding the end with the metal fingers into the SIMM socket at approximately a 45-degree angle to the system card. Gently rock the SIMM back into place until the latch on either side snaps into place. Do not use excessive force because the connector could break.

Proceed with the next section "Replacing the Router Cover."

Replacing the Router Cover

Take the following steps to replace the router cover:

Step 1 Align the top and bottom sections of the router.

Step 2 Close the cover by slowly pressing the top and bottom sections together. (See Figure 6.)

Figure 6 : Replacing the Cover

Step 3 Turn the router so that the rear panel is facing you, and replace the two screws that you removed from the rear panel earlier.

Step 4 Using both hands to hold the router top and bottom together, turn the router upside down so that the top of the router is resting on the flat surface. Replace the screw that you removed earlier from the underside of the router.

Step 5 Place the router right side up on the flat surface and reconnect all cables to the router.

Step 6 Turn ON the power by pressing the power switch to the on ( | ) position.

Proceed with the next section, "Checking the DRAM SIMM Installation."

Checking the DRAM SIMM Installation

After installing the DRAM SIMM, you should verify the installation by reading the messages the router displays when you power it on:

If the DRAM SIMM is installed correctly, a message similar to the following will be displayed:

Cisco Internetwork Operating System Software 
IOS (tm) 1600 Software (C1600-Y-L), Version 11.1(16539)
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Tue 29-Oct-96 21:30 by xxxxx
Image text-base: 0x08019CB4, data-base: 0x02005000
 
cisco 1600 (68360) processor (revision C) with 9728K/512K bytes of memory.
Processor board ID 01335537
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
Basic Rate ISDN software, Version 1.0.

Notice that the display shown in bold text indicates how much main memory is installed in the router. In this example, the router has 10 MB of main memory---the memory stored in the DRAM SIMM (8 MB) plus the memory stored in the fixed memory chips (2 MB).

If the DRAM SIMM in not installed correctly or is defective, the memory amount stored in the DRAM SIMM is not reflected in the message display. In the following display, an 8 MB DRAM SIMM has been installed incorrectly in the router:

Cisco Internetwork Operating System Software 
IOS (tm) 1600 Software (C1600-Y-L), Version 11.1(16539)
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Tue 29-Oct-96 21:30 by xxxxx
Image text-base: 0x08019CB4, data-base: 0x02005000
 
cisco 1600 (68360) processor (revision C) with 1536K/512K bytes of memory.
Processor board ID 01335537
Bridging software.
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
Basic Rate ISDN software, Version 1.0.

Notice that the line listing the main memory (shown in bold) shows only the 2 MB of memory that is stored in the fixed memory chips.

If the DRAM SIMM memory is not reflected in the display, repeat the DRAM SIMM upgrade procedure to reinstall the DRAM SIMM. Make sure the DRAM SIMM is completely seated in the SIMM socket. If display still does not reflect the additional memory stored in the DRAM SIMM, the DRAM SIMM might be defective.

Obtaining Service and Support

For service and support for a product purchased from a reseller, contact the reseller. Resellers offer a wide variety of Cisco service and support programs, which are described in the section "Service and Support" in the information packet that shipped with your chassis.