Cisco Systems 815 Manual De Usuario

This section describes the types of memory stored in the router and how to find 
out how much of each type of memory is stored in the router.

For instruction on how to upgrade memory in the router, see 

The Cisco 815 integrated services router has the following types of memory:

Dynamic random-access memory (DRAM)—This is the main storage 
memory for the router. DRAM is also called working storage. It contains the 
dynamic configuration information. The DRAM in the Cisco 815 integrated 
services router stores a working copy of the Cisco IOS software, dynamic 
configuration information, and routing table information.

Nonvolatile random-access memory (NVRAM)—This type of memory 
contains a backup copy of the router configuration. If the power is lost or the 
router is turned off, this backup copy enables the router to return to operation 
without reconfiguration.

Flash memory—This special kind of erasable, programmable memory 
contains a copy of the Cisco IOS software. The flash memory structure can 
store multiple copies of the Cisco IOS software. You can load a new level of 
the operating system in every router in your network and then, when 
convenient, upgrade the whole network to the new level.

2-port serial cards—Blinks when data is being sent to or received from 
the second port on the 2-port card in the WIC 1 slot.

ETH

N/A

N/A.

ACT

Green

Blinks when there is network activity on the Ethernet port.

COL

Yellow

Blinks when there are packet collisions on the local Ethernet network.