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Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter 2 Common Control Cards
2.2.1 TCC2 Card Functionality
2.2.1 TCC2 Card Functionality
The TCC2 card supports multichannel, high-level data link control (HDLC) processing for the
DCC/GCC. Up to 84 DCCs can be routed over the TCC2 card and up to 84 section DCCs can be
terminated at the TCC2 card (subject to the available optical digital communication channels). The
TCC2 card selects and processes 84 DCCs to facilitate remote system management interfaces.
The TCC2 card 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 TCC2 card nonvolatile memory, which
allows quick recovery in the event of a power or card failure.
The TCC2 card performs all system-timing functions for each ONS 15454 SDH. It monitors the
recovered clocks from each traffic card and two BITS ports for frequency accuracy. The TCC2 card
selects a recovered clock, a BITS, or an internal Stratum 3 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 TCC2 card to synchronize with the recovered clock, which provides holdover if the
reference is lost.
The TCC2 card monitors both supply voltage inputs on the shelf. An alarm is generated if one of the
supply voltage inputs has a voltage outside of the specified range.
Install TCC2 cards in Slots 7 and 11 for redundancy. If the active TCC2 card fails, traffic switches to the
protect TCC2 card. All TCC2 card protection switches conform to protection switching standards when
the bit error rate (BER) counts are not in excess of 1 * 10 exp – 3 and completion time is less than 50 ms.
The TCC2 card has two built-in interface ports for accessing the system: an RJ-45 10BaseT LAN
interface and an EIA/TIA-232 interface for local craft access. It also has a 10BaseT LAN port for user
interfaces via the backplane to the port accessible on the MIC-C/T/P Front Mount Electrical Connection
(FMEC).
Cisco does not support operation of the ONS 15454 SDH with only one TCC2 card. For full
functionality and to safeguard your system, always operate each ONS 15454 SDH with two TCC2 cards.
Note CTC software does not monitor for the absence of FMECs unless the TCC2 card(s) have reached the
Active/Standby state. During transitional states such as power-up or TCC2 card reset, CTC ignores the
FMEC inventory displayed in node view.
Note When a second TCC2 card is inserted into a node, it synchronizes its software, its backup software, and
its database with the active TCC2 card. If the software version of the new TCC2 card does not match the
version on the active TCC2 card, the newly inserted TCC2 card copies from the active TCC2 card, taking
about 15 to 20 minutes to complete. If the backup software version on the new TCC2 card does not match
the version on the active TCC2 card, the newly inserted TCC2 card copies the backup software from the
active TCC2 card again, taking about 15 to 20 minutes. Copying the database from the active TCC2 card
takes about 3 minutes. Depending on the software version and backup version the new TCC2 card started
with, the entire process can take between 3 and 40 minutes.
2.2.2 TCC2 Card-Level Indicators
Table 2-7 describes the two card-level LEDs on the TCC2 card faceplate.