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Cisco XR 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 Cisco XR 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 22 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.
–
Size of the DIMMs in the transmit buffer need not match the size of the SDRAM DIMMs in the
receive buffer.
–
DIMMs must be 3.3V devices.
Instructions are in the following sections:
• Removing a DIMM, page 69
• Installing a DIMM, page 70
• Removing a SODIMM, page 71
Table 22 Ethernet Line Card Packet Memory Options
Total Packet Memory
1
1. The SDRAM DIMMs installed in a givenbuffer (either receive ortransmit) must bethe same typeand 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