Cisco 3845 Hardware Guide - Page 25

Memory Memory Cisco 3800 series routers contain the following types of memory: • Main memory consists of ECC DDR SDRAM. It stores the running configuration and routing tables, and buffers packets at the network interfaces. Both routers ship with 256 MB of main memory. The two DIMM slots can be upgraded with 128-MB, 256-MB, or 512-MB DIMMs to a maximum of 1024 MB (1 GB). • An external CompactFlash memory card stores the Cisco IOS software image. The routers are shipped with a 64-MB CompactFlash memory card, which can be upgraded to 128 MB or 256 MB. • The routers boot from 4 MB of internal flash memory. This memory cannot be upgraded. Power Table 1 summarizes power options for Cisco 3800 series routers. Both the Cisco 3825 router and the Cisco 3845 router support an AC input power supply, an AC input power supply with IP phone power output, or a DC input power supply. The Cisco 3825 router has one internal power supply and also provides a connector for the optional Cisco Redundant Power System (RPS) external backup power source. The Cisco 3845 router supports two internal power supplies and operates in redundant mode both are installed. Table 1 Cisco 3800 Series Routers Power Options Router Cisco 3825 Cisco 3845 Power Option AC input without IP phone power output AC input with 24 ports of IP phone power output DC input without IP phone power output Cisco Redundant Power System AC input without IP phone power output AC input with 48 ports of IP phone power output DC input without IP phone power output Second internal power supply Input 100-240 VAC, 3 A 100-240 VAC, 8 A 24-60 VDC, 12 A 100 VAC, 10 A 240 VAC, 6 A 100-240 VAC, 5 A 100-240 VAC, 9 A 24-60 VDC, 19 A Any option above None IP Phone Power Output -48 VDC, 360 W None If supported by router power supply None -48 VDC, 360 W None OL-5966-01 Overview of Cisco 3800 Series Routers 11