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Upgrading Memory on a Line Card
Cisco 12008 Gigabit Switch Router Installation and Configuration Guide
7-80
Upgrading Memory on a Line Card
This section presents the procedures for upgrading memory on a Cisco 12000 series line
card.
The Cisco 12000 series line cards used with the Cisco 12008 incorporate the following
types of onboard memory:
• DRAM—Each Cisco 12000 series line card has two DRAM DIMM sockets (see
Figure 7-30). The DRAM is used by the line card’s processor. The default DRAM
configuration for the line card’s processor is 32 MB—one 32-MB DIMM in socket P4
DIMM0.
• SDRAM—Each Cisco 12000 series line card incorporates four SDRAM DIMM sockets
(see Figure 7-30). The SDRAM is used by the line card’s transmit and receive buffers.
The default SDRAM configuration for a line card receive (RX) or transmit (TX) buffer
is 16 MB.
All four SDRAM DIMM sockets must be populated with DIMMs to enable the receive
and transmit buffers to operate properly. Also, both DIMMs installed in a given buffer
pair (either transmit or receive) must be of the same size; however, the size of the
DIMMs installed in the pair of transmit buffers need not be the same as the size of those
installed in the pair of receive buffers, and vice versa.
Both types of memory in the Cisco 12000 series line cards can be upgraded in the field.
You will need the following tools to install or replace memory on the Cisco 12000 series
line cards:
• 1/4-inch flat-blade screwdriver
• 3/16-inch flat-blade screwdriver
• Your own ESD-prevention equipment or the disposable grounding wrist strap included
with all upgrade kits, field-replaceable units (FRUs), and spares for the Cisco 12000
series routers
• An antistatic mat or surface
• Small needle nose pliers
• The appropriate DRAM DIMM or SDRAM DIMM module(s) for configuring memory
in the desired amount (see Table 7-4 or Table 7-5).