Cisco 12000 Series Installation And Configuration Manual page 48

Line Card Memory
ATM 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.
Caution Packet memory is only user serviceable on the Engine 0 and Engine 2 line cards. Refer to
engine information for your line card. Do not attempt to remove or install these modules in other line
cards.
Table 17
Table 17 ATM Line Card Packet Memory Options
Engine Number Total Packet Memory
Engine 0 128 MB
Engine 2 256 MB
Engine 2 512 MB (upgrade)
1. The 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.
Removing and Installing Line Card Memory
Before you begin 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:
•
•
ATM Line Card Installation and Configuration
48
lists the packet memory options for the Engine 0 and Engine 2 line cards.
1
Cisco Product Number
MEM-LC-PKT-128=
MEM-LC1-PKT-256=
MEM-PKT-512-UPG=
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 3.3 V 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.
–
DIMM Modules DIMM Sockets
2 RX 32-MB DIMMs RX DIMM0 and RX DIMM1
2 TX 32-MB DIMMs TX DIMM0 and TX DIMM1
2 RX 64-MB DIMMs RX DIMM0 and RX DIMM1
2 TX 64-MB DIMMs TX DIMM0 and TX DIMM1
2 RX 128-MB DIMMs RX DIMM0 and RX DIMM1
2 TX 128-MB DIMMs TX DIMM0 and TX DIMM1
Table 14 for
OL-13004-01