Cisco Systems 12000 series specifications Removing and Installing Line Card Memory

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 Table 14 for engine information for your line card. Do not attempt to remove or install these modules in other line cards.

Table 17 lists the packet memory options for the Engine 0 and Engine 2 line cards.

Table 17	ATM Line Card Packet Memory Options
Engine Number	Total Packet Memory1	Cisco Product Number	DIMM Modules	DIMM Sockets
Engine 0	128 MB	MEM-LC-PKT-128=	2 RX 32-MB DIMMs	RX DIMM0 and RX DIMM1
			2 TX 32-MB DIMMs	TX DIMM0 and TX DIMM1
Engine 2	256 MB	MEM-LC1-PKT-256=	2 RX 64-MB DIMMs	RX DIMM0 and RX DIMM1
			2 TX 64-MB DIMMs	TX DIMM0 and TX DIMM1
Engine 2	512 MB (upgrade)	MEM-PKT-512-UPG=	2 RX 128-MB DIMMs	RX DIMM0 and RX DIMM1
			2 TX 128-MB DIMMs	TX DIMM0 and TX DIMM1

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:

•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.

ATM Line Card Installation and Configuration

48 OL-13004-01