Tsc Slots And Connectors - Cisco ONS 15600 Reference Manual

Chapter 2 Cards Features and Functions
2.2 TSC Card
Do not operate the ONS 15600 with a single TSC card or a single SSXC card installed. Always operate
Caution
the shelf with one active card and one protect card.
The timing and shelf controller (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, but the
ONS 15600 does not support mixed timing references. 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. You cannot
specify BITS as the primary reference and a line source as the secondary reference. 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. All TSC card protection switches conform to the
Telcordia protection switching standard of equal to or less than 50 ms.
The TSC card features 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.
Cisco ONS 15600 Reference Manual, R5.0
2.2 TSC Card
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