Cisco Systems Cisco uBR10012 manual 16 TCC+ Card Faceplate

Chapter 1 Cisco uBR10012 Universal Broadband Router Overview

Cisco uBR10012 Universal Broadband Router Modules

When two TCC+ cards are installed, they are configured as active and backup (redundant). If the TCC+ card in the first slot is working at system power-up, it automatically becomes the active card and the TCC+ card in the second slot becomes the backup card. The TCC+ cards monitor each other’s priority information so that if the active card fails, the active card role is transferred to the redundant backup card without lose of data.

Each TCC+ card contains two RJ-45 connectors on its faceplate labeled Primary and Secondary. These connectors are for a primary and secondary (redundant) Stratum 3 external clock reference source that is traceable to a Stratum 1 clock source. The external reference source allows the Cisco uBR10012 reference clock to be synchronized to the Stratum 1 clock source, providing a free-running DOCSIS-quality clock reference and time stamp to the cable interface line cards.

Caution The TCC+ card can connect only to a national clock source such as a GPS receiver or BITS clock. The Cisco uBR10012 router does not support connecting the RJ-45 connectors on the TCC+ cards directly to an outside plant line or telco-provided T1/E1 clock source. You can use an outside or telco-provided T1/E1 clock source only by connecting the source to the TCC+ cards using a CSU/DSU or other equipment that is approved to FCC part 68 and ANSI/UL1950 for the connection to the PSTN.

If present, the primary external clock reference on the active TCC+ card is used. If it is lost, the secondary clock reference on the active TCC+ card is used. If the active TCC+ card stops functioning, control is transferred to the backup TCC+ card, which then uses its primary and secondary clock reference sources. If neither card has a valid clock reference source, the active TCC+ card uses its own internal clock to provide the DOCSIS-quality clock reference and time stamp.

Note You do not need to provide any external clock reference source to the TCC+ cards. However, you must always have at least one functioning TCC+ card installed in the Cisco uBR10012 chassis to ensure proper systems operation.

Figure 1-23shows the faceplate of the TCC+ card. The handle provides for the insertion and removal of the card from the chassis.

Caution Do not attempt to lift the chassis using one of these handles.

Figure 1-16 TCC+ Card Faceplate

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	Cisco uBR10012 Universal Broadband Router Hardware Installation Guide
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