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Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 4 Troubleshooting Line Cards
Troubleshooting the Timing, Communication, and Control Plus Card
The show controllers clock-reference command
displays compare errors between the two TCC+
cards installed in the Cisco uBR10012 router.
1. If this occurs at system startup or only occasionally at other times,
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.
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
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.
1. Verify that at least one TCC+ card is installed in the chassis. If not,
install a TCC+ card.
2. Verify that a valid national clock source, such as a GPS receiver or
BITS clock, is plugged into the TCC+ card’s RJ-45 connector.
3. Replace the TCC+ card.
Table 4-4 TCC+ Card Faults and Recommended Responses
Fault Type Response