Cisco 7000 Hardware Installation And Maintenance page 173

Installing and Configuring Processor Modules
Jumpers J3 and J4 (see Figure 5-4 for location) are set according to the size of the eight software
EPROMs on the RP. These jumpers correspond to the EPROMs only; you do not need to reset the
jumpers when loading a larger image into Flash memory. See Figure 5-8 for jumper settings.
Figure 5-4 RP Jumper Locations
J3 J4
J2, Flash
write-protection jumper
Configuration
register
Hardware Configuration Register Settings
The hardware configuration register (see Figure 5-4) comprises the upper 32 pins of a 50-pin jumper
block located above the Flash memory card port on the RP. You can define system boot instructions,
set broadcast addresses and console baud rates, or instruct the router to perform factory diagnostics
at startup by installing jumpers on specific pins. Jumper bit (or position) 0 is the top pair of pins. To
set a bit to 1, insert a jumper. To clear a bit to 0, remove the jumper.
To change configuration register settings, you must turn off the system power and remove the RP.
Figure 5-5 shows the configuration register with the factory default setting, with jumpers installed
on bits 0 and 8. Bit 0 instructs the system to boot from ROM; bit 8 instructs the system to ignore the
Break key on the console terminal keyboard.
Maintenance 5-169