The Timing, Communications, and Control (TCC) cards used for ONS 15454 MSTP operation are the same TCC used for ONS 15454 MSPP configurations. Chapter 6 covered the features and functions of the TCC interface in detail. The information is repeated here for convenience. The Timing, Communications, and Control (TCC) cards are required for operation of the ONS 15454 MSPP system and are installed in a redundant pair in shelf Slots 7 and 11. Two current versions are available from Cisco: the Advanced Timing, Communications, and Control card (TCC2), and the Enhanced Advanced Timing, Communications, and Control card (TCC2P). Both perform the same basic functions, but the TCC2P is an updated version of the TCC2 and includes some security enhancements and additional synchronization options that are not available in the TCC2. Both cards have a purple square symbol on their faceplates, which corresponds to matching symbols on the front of the ONS 15454 shelf assembly. This serves as an aid in easily identifying the correct location to install the card. TCC cards are the only card type allowed in Slots 7 and 11, and both slots should always be equipped. Cisco does not support the operation of the ONS 15454 MSPP system with only a single TCC card installed. Although the system technically can function with only a single card, the second card is necessary for redundancy and to allow for continuity of system traffic in case of a failure or reset of the primary card. The system raises the "Protection Unit Not Available" (PROTNA) alarm if the secondary TCC card is not installed. Two earlier versions of the TCC2 and TCC2P cards exist, called simply the Timing, Communications, and Control (TCC) card and the TCC Plus (TCC+). These older-version TCC cards provide similar functionality to the current cards, but they are much more limited in processing power. Although they can may be installed in some existing systems, Cisco no longer produces the TCC or TCC+ versions. The TCC2 and TCC2P cards perform a variety of critical system functions, including the following:
Figure 9-2 shows a diagram of the faceplate of the TCC2/TCC2P card. Figure 9-2. TCC2/TCC2P Faceplate Diagram
The two card types are identical in appearance, with the exception of the card name labeling. The cards have 10 LEDs on the faceplate, including the following:
The faceplate also has two push-button controls. The LAMP TEST button initiates a brief system LED test, which lights every LED on each installed card and the fan tray LEDs (with the exception of the FAN FAIL LED, which does not participate in the test). The RS-232 and Transmission Control Protocol/Internet Protocol (TCP/IP) connectors allow for management connection to the front of the ONS 15454 shelf. TCP/IP is an RJ-45 that allows for a 10Base-T connection to a PC or workstation that uses the CTC management system. A redundant local-area network (LAN) connection is provided via the backplane LAN pins on the rear of the shelf. The RS-232 is an EIA/TIA-232 DB9-type connector used for TL1 management access to the system. The CRAFT wire-wrap pins on the shelf backplane duplicate the functionality of this port. |