user manual

4-8
Cisco uBR10012 Universal Broadband Router Troubleshooting Guide
OL-1237-01
Chapter 4 Troubleshooting Line Cards
Troubleshooting the Timing, Communication, and Control Plus Card
Troubleshooting the Timing, Communication, and Control Plus
Card
At least one working Timing, Communication, and Control Plus (TCC+) card must be installed in the
Cisco uBR10012 router for normal operations. The TCC+ card acts as a secondary processor that
performs the following functions:
• Generates and distributes 10.24 MHz clock references to each cable interface line card.
• Generates and distributes 32-bit time stamp references to each cable interface line card.
• Allows software to independently power off any or all cable interface line cards.
• Provides support for Online Insertion/Removal (OIR) operations of line cards.
• Drives the LCD panel used to display system configuration and status information.
• Monitors the supply power usage of the chassis.
• Provides two redundant RJ-45 ports for external timing clock reference inputs such as a Global
Positioning System (GPS) or BITS clock.
If the Cisco uBR10012 router does not have a working TCC+ card installed, the WAN and cable interface
line cards will experience excessive packet drops, or all traffic will be dropped, because of an invalid
timing signal. Also, if no TCC+ card is installed, the cable power command is disabled, because this
function is performed by the TCC+ card.
Note Because the TCC+ card is considered a half-height card, use slot numbers 1/1 or 2/1 to display
information for the TCC+ card using the show diag command. The show cable clock and show
controllers clock-reference commands also use these slot numbers when displaying clock-related
information.
Figure 4-1 TCC+ Front Panel
The front panel on the TCC+ card has seven LEDs. Table 4-3 describes each LED on the TCC+ card.
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