2-4
CRBRIM-W/T
CHAPTER 2: Product Overview
Table 2-2 shows possible memory configurations for the CRBRIM-W/T.
2.3
Protocol Support
The CRBRIM-W/T is hardware encoded at the factory to operate with one of three
router software sets. This provides users with the option of selecting IP,
DESKTOP, or ENTERPRISE routing software at the time of purchase.
1. The router has 2 MB of permanent (fixed) DRAM memory and a DRAM SIMM
socket for upgrading the memory. 1 MB of this permanent memory is used by the
CPU and is called
primary memory. The other 1 MB of memory is used by the net-
work interface ports to store packets and is called
shared or packet memory. When
a DRAM SIMM is installed in the DRAM SIMM socket, all of the DRAM memory on
this SIMM becomes primary memory for the CPU, and the 2 MB of DRAM that is
permanent on the board becomes shared memory.
2. The ENTERPRISE router ships with 8 MB of System-code memory.
Table 2-2. Memory Configurations
Memory Type
Memory Capacity
Primary memory (DRAM SIMMs)
1 MB (expandable to 4 or 16 MB)
Shared (packet) memory
1 MB (DRAM on board)
1
System-code memory (Flash or
PROMs)
4 MB (expandable)
2
Boot ROM
1 MB
Nonvolatile RAM (NVRAM)
32 KB
The CRBRIM-W/T is factory configured for either IP, DESKTOP
or ENTERPRISE Routing Software. The factory hardware settings
are permanent and cannot be changed to operate a different router
software set.
NOTE
