Cisco Systems Cisco XR 12416 manual PRP Auxiliary and Console Ports, PRP Reset Switch

Chapter 1 Product Overview

Route Processor

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.

	Cisco XR 12416 Router Installation Guide
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