Cisco Systems OL-11497-03 manual Troubleshooting the Line Cards, LED Display1 Indications2

Chapter 4 Troubleshooting the Installation

Problem Solving with Subsystems

Troubleshooting the Line Cards

Line cards can be installed in slots in the card cage. As each line card powers up,

apower-on self-test (POST) is performed on the line card memory. A full set of field diagnostics can also be run on a line card from the system console, providing a pass/fail message both in the line card alphanumeric LED display and on the system console.

To help isolate a problem with the line cards, visually check the two alphanumeric LED displays to determine whether both display banks are on.

The two displays are powered separately. The left display receives power from the DC-DC converter on the line card. The right display is powered directly from the backplane. Therefore, even if the line card has not powered up, the right display could be on. If both displays are off, the line card might not be fully plugged into the backplane connector, there might be a problem with the MBus module on the line card, or system power might be off.

If both displays are on, check the message being displayed. As soon as the DC-DC converter is turned on by the MBus module, the processor on the line card begins the boot process. Status messages are displayed in the alphanumeric displays as the boot process continues on the line card.

Table 4-9provides a list of messages that can be displayed by the line card alphanumeric LED display. Some of these messages are displayed only for a fraction of a second; others last for several seconds.

	Table 4-9	Line Card Alphanumeric LED Display Messages
	LED Display1		Indications2
	MEM		POST memory test running
	TEST
	LROM		POST memory test has finished running
	RUN
	BSS		Initialize main memory for ROM
	INIT
	RST		Save reset reason register
	SAVE
	IO		Reset the I/O system on the card
	RST
	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03				4-31