Specifications

4-17
Cisco ONS 15454 Troubleshooting and Maintenance Guide
November 2001
Chapter 4 Card Reference
Timing Communication and Control (TCC+) Card
4.6 Timing Communication and Control (TCC+) Card
The TCC+ performs system initialization, provisioning, alarm reporting, maintenance, diagnostics, IP
address detection/resolution, SONET Data Communications Channel (DCC) termination, and system
fault detection for the ONS 15454. The TCC+ also ensures that the system maintains Telcordia timing
requirements. Figure 4-4 shows the TCC+ faceplate and a block diagram of the card.
Figure 4-4 TCC+ faceplate and block diagram
The node database, IP address, and system software are stored in TCC+ non-volatile memory, which
allows quick recovery in the event of a power or card failure.
The TCC+ supports multichannel, high-level data link control (HDLC) processing for the DCC. Up to
48 DCCs can be routed over the Serial Communication Interface (SCI) and terminated at the TCC+. The
TCC+ selects and processes ten DCCs to facilitate remote system management interfaces.
The TCC+ performs all system-timing functions for each ONS 15454. The TCC+ monitors the recovered
clocks from each traffic card and two DS-1 (BITS) interfaces for frequency accuracy. The TCC+ 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 TCC+ to synchronize with the recovered clock, which provides holdover if the reference is
lost.
DCC
Processor
Flash
Control
Processor
Framer/
LIU
RAM
FlashRAM
TDM/SCC Mux
Message
Router
TDM
Crossconnect
Timing
Controller
10BaseT
Craft
10BaseT
Modem
Ethernet
Hub
Front Panel
B
a
c
k
p
l
a
n
e
61339
FAIL
ACT/STBY
ACO
CRIT
MIN
REM
SYNC
MAJ
ACO
LAN
CRAFT
TCC+
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