Cisco Systems XR 12404 manual Total, Sdram Sockets Number of DIMMs

Chapter 1 Cisco XR 12404 Router Overview

Route Processor

PRP SDRAM

The PRP uses Error Checking and Correction (ECC) Synchronized Dynamic Random Access Memory (SDRAM) to store routing tables, protocols, network accounting applications, and to run Cisco IOS software.

Table 1-2lists the DRAM configurations for the PRP. If you are using:

•One DIMM—Bank 1 (U15) must be populated first.

•Two DIMMs—You cannot mix memory sizes; both banks must contain the same size DIMM.

Table 1-2	PRP DRAM Configurations
Total
SDRAM	SDRAM Sockets	Number of DIMMs
512 MB1	U15 (bank 1)	One 512 MB DIMM
	U18 (bank 2)	or
		Two 256 MB DIMMs
1 GB	U15 (bank 1)	One 1 GB DIMM
	U18 (bank 2)	or
		Two 512 MB DIMMs
2 GB	U15 (bank 1)	Two 1 GB DIMMs
	U18 (bank 2)
1. Default shipping configuration.

Caution DRAM DIMMs must be 3.3-volt, 60-nanosecond devices only. Do not attempt to install other devices in the DIMM sockets. To prevent memory problems, use the Cisco approved memory products listed in Table 1-2.

PRP SRAM

Static Random Access Memory (SRAM) provides 2 MB of secondary CPU cache memory. Its principal function is to act as a staging area for routing table updates, and for information sent to and received from the line cards. SRAM is not user-configurable and cannot be upgraded in the field.

	Cisco XR 12404 Router Installation Guide
OL-13830-02		1-11