Router Installation Guide

Chapter 1 Product Overview
Route Processor
1-24
Cisco XR 12416 Router Installation Guide
OL-13833-01
PRP Auxiliary and Console Ports
The auxiliary and console ports on the PRP are EIA/TIA-232 (also known as
RS-232) asynchronous serial ports. These ports connect external devices to
monitor and manage the system.
• The auxiliary port—A (male) plug that provides a data terminal equipment
(DTE) interface. The auxiliary port supports flow control and is often used to
connect a modem, a channel service unit (CSU), or other optional equipment
for Telnet management.
• The console port—A (female) receptacle that provides a data
circuit-terminating equipment (DCE) interface for connecting a console
terminal.
PRP Reset Switch
Access to the (soft) reset switch is through a small opening in the PRP front panel
(see Figure 1-11). To press the switch, insert a paper clip or similar small pointed
object into the opening.
Caution The reset switch is not a mechanism for resetting the PRP and reloading the
Cisco IOS image. It is intended for software development use only. To prevent
system problems or loss of data, use the reset switch only on the advice of Cisco
service personnel.
Pressing the reset switch causes a nonmaskable interrupt (NMI) and places the
PRP in ROM monitor mode. When the PRP enters ROM monitor mode, its
behavior depends on the setting of the PRP software configuration register. For
example, if the boot field of the software configuration register is set to:
• 0x0—The PRP remains at the ROM monitor prompt (rommon>) and waits for
a user command to boot the system manually.
• 0x1—The system automatically boots the first Cisco IOS image found in
flash memory on the PRP.