Cisco 15454-TCC - Network Processor Card Operation Manual page 3

Figure 2
Controller
Crossconnect
TCC-I Functionality
The TCC-I supports multichannel, high-level data link control (HDLC) processing for the DCC. Up to
48 DCCs can be routed over the TCC-I and up to ten DCCs can be terminated at the TCC-I (subject to
available optical digital communication channels). The TCC-I selects and processes ten DCCs to
facilitate remote system management interfaces.
The TCC-I also originates and terminates a cell bus carried over the module. The cell bus supports links
between any two cards in the system, which is essential for peer-to-peer communication. Peer-to-peer
communication accelerates protection switching for redundant cards.
The node database, IP address, and system software are stored in TCC-I non-volatile memory, which
allows quick recovery in the event of a power or card failure.
The TCC-I performs all system-timing functions for each ONS 15454 SDH. The TCC-I monitors the
recovered clocks from each traffic card and two BITS ports for frequency accuracy. The TCC-I selects
a recovered clock, a BITS or an internal Stratum 3 E reference as the system-timing reference. You can
provision any of the clock inputs as primary or secondary timing sources. A slow-reference tracking loop
allows the TCC-I to synchronize with the recovered clock, which provides holdover if the reference is
lost.
78-14610-01
TCC-I block diagram
RAM
Timing
RAM Flash
Framer/
LIU
Message
Router
TDM
TCC-I Timing Communication and Control Card Description
Flash
DCC
Processor
Control
Processor
TDM/SCC Mux
10BaseT
Modem
Ethernet
Hub
10BaseT
Craft
Installing ONS 15454 SDH TCC-I Cards
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