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CiscoXR 12000 Series Router Ethernet Line Card Installation
OL-7861-01
Line Card Memory
If you are upgrading or replacing line card route and packet memory, refer to the CiscoXR 12000 Series
Router Memory Replacement Instructions publication for installation procedures and the most
up-to-date memory options.

Ethernet Line Card Packet Memory Options

Line card packet memory temporarily stores data packets awaiting switching decisions by the line card
processor. Once the line card processor makes the switching decisions, the packets are propagated into
the router switch fabric for transmission to the appropriate line card.
Table 2 2 lists the packet memory options for Ethernet line cards.
Removing and Installing Line Card Memory
Before beginning the memory replacement procedures in this section, ensure that you have the proper
tools and equipment at hand, and that you are using appropriate ESD-prevention equipment and
techniques. Before removing or installing memory, observe the following guidelines:
•Route memory DIMMs
–
Route memory DIMM0 socket must always be populated.
–
For certain memory configurations, the route memory DIMM1 socket can remain empty.
–
DIMMs must be 3.3V devices.
•Packet memory DIMMs
–
All four DIMM sockets for SDRAM buffer memory must be populated.
–
Both DIMM sockets for a given buffer pair (either those for the transmit buffer or those for the
receive buffer) must be populated with SDRAM DIMMs of the same type and size.
256 MB MEM-GRP/LC-256= 2 128-MB DIMMs DIMM0 and DIMM1
256 MB MEM-LC4-256=21 256-MB SODIMM Varies
1. This option adds a second 64-MB DIMM for a total of 128 MB for line cards that are equipped with 64 MB.
2. This option is only compatible with the 4-Port Ethernet line cards and is for replacement only.
Table21 Route Memory Configurations for Ethernet Line Cards (continued)
Total Route Memory Cisco Product Number DIMM Module Route Memory DIMMSockets
Table22 Ethernet Line Card Packet Memory Options
Total Packet Memory1
1. The SDRAM DIMMs installed in a given buffer (either receive or transmit) must be the same type and size, but the individual
receive and transmit buffers can operate with different memory capacities.
Cisco Product Number DIMM Modules DIMM Sockets
256 MB MEM-LC1-PKT-256= 2 RX 64-MB DIMMs
2 TX 64-MB DIMMs
RX DIMM0 and RX
DIMM1
TX DIMM0 and TX
DIMM1
512 MB (upgrade) MEM-PKT-512-UPG= 2 RX 128-MB DIMMs
2 TX 128-MB DIMMs
RX DIMM0 and RX
DIMM1
TX DIMM0 and TX
DIMM1