Cisco uBR10012 Troubleshooting Manual page 59

Chapter 4 Troubleshooting Line Cards
Table 4-4
Fault Type
The show controllers clock-reference command
displays compare errors between the two TCC+
cards installed in the Cisco uBR10012 router.
The show controllers command for a cable
interface displays the message "Timestamp is
from local oscillator." This command should
show that the timestamp is coming either from an
external source or from the TCC+ card.
OL-1237-01
TCC+ Card Faults and Recommended Responses
Response
If this occurs at system startup or only occasionally at other times,
1.
this error can be ignored, because the system typically records a
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.
If this error repeatedly occurs, it could indicate a hardware problem
2.
with one of the TCC+ cards. Try replacing each card to see if the
problem disappears.
Verify that at least one TCC+ card is installed in the chassis. If not,
1.
install a TCC+ card.
Verify that a valid national clock source, such as a GPS receiver or
2.
BITS clock, is plugged into the TCC+ card's RJ-45 connector.
Replace the TCC+ card.
3.
Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
Troubleshooting the Timing, Communication, and Control Plus Card
4-11