Cisco Systems UBR10012 manual Show controllers clock-reference command

Chapter 4 Troubleshooting Line Cards

Troubleshooting the Timing, Communication, and Control Plus Card

Table 4-4 TCC+ Card Faults and Recommended Responses

Fault Type	Response
The show controllers clock-reference command	1. If this occurs at system startup or only occasionally at other times,
displays compare errors between the two TCC+		this error can be ignored, because the system typically records a
cards installed in the Cisco uBR10012 router.		slight delay when the TCC+ cards synchronize with each other. These
		initial compare errors can be ignored and cleared with the cable
		clock clear-counters command.
	2.	If this error repeatedly occurs, it could indicate a hardware problem
		with one of the TCC+ cards. Try replacing each card to see if the
		problem disappears.
The show controllers command for a cable	1.	Verify that at least one TCC+ card is installed in the chassis. If not,
interface displays the message “Timestamp is		install a TCC+ card.
from local oscillator.” This command should	2.	Verify that a valid national clock source, such as a GPS receiver or
show that the timestamp is coming either from an
		BITS clock, is plugged into the TCC+ card’s RJ-45 connector.
external source or from the TCC+ card.
	3.	Replace the TCC+ card.

Cisco uBR10012 Universal Broadband Router Troubleshooting Guide

OL-1237-01 4-11