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Cisco ONS 15600 Reference Manual, R7.2
Chapter 2 Card Reference
2.2 TSC Card
2.2 TSC Card
Note
For hardware specifications, see the “A.2.1 TSC Card Specifications” section on page A-5.
Caution
Do not operate the ONS 15600 with an unprotected, single TSC card or a single SSXC card installed.
Always operate the shelf with one active card and one protect card for each of these control cards.
The TSC card performs all system-timing functions for each ONS 15600. The TSC card monitors the
recovered clocks from each traffic card and two building integrated timing supply (BITS) interfaces for
frequency accuracy. The TSC card is provisionable, allowing timing from any optical interface source,
a BITS input source, or the internal Stratum 3E as the system-timing reference. You can provision any
of the clock inputs as primary or secondary timing sources. If you specify external timing references,
your options are BITS1, BITS2, and the internal Stratum 3E sources. If you select line timing, you can
specify up to two line ports from which to derive timing, as well as the internal stratum 3E sources. The
TSC card also supports BITS OUT. A slow-reference tracking loop allows the TSC to synchronize with
the recovered clock and enables holdover if the reference is lost.
The TSC card also provides shelf control related functions. The TSC card has a 100-Mbps Ethernet link
to each card on the shelf and monitors the presence of these cards. The TSC provides bulk memory for
nonvolatile storage of system software and data and provides EIA-TIA 232 and Ethernet customer
interfaces. The TSC card processes and routes line and section DCC traffic as well as routing the K1,
K2, and K3 overhead bytes between traffic (line) cards and SSXC cards. The TSC card controls and
monitors the shelf fans and all of the alarm interfaces.
2.2.1 TSC Slots and Connectors
Install TSC cards in Slots 5 and 10 for redundancy. If the active TSC card fails, timing reference and
control function switches to the protect TSC card.
Note
All TSC card protection switches conform to the Telcordia protection switching standard of equal to or
less than 50 ms.
The TSC card has an RJ-45 10/100 Base-T LAN port on the faceplate. Two additional RJ-45
10/100 Base-T LAN ports and two RS-232 DB-9 type craft user interfaces are available via the Customer
Access Panel (CAP) on the backplane.