Cisco ONS 15454 SDH Specifications Page 129

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3-9
Cisco ONS 15454 SDH Troubleshooting and Maintenance Guide, R3.3
May 2002
Chapter 3 Card Reference
Timing Communication and Control (TCC-I) Card
Figure 3-4 TCC-I faceplate
3.6.1 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 node, 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
61207
FAIL
ACT/STBY
ACO
CRIT
MIN
REM
SYNC
ASYNC
LAN
MAJ
ACO
TCC-I
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