JCS 1200 Platform Power Overview
The JCS 1200 platform does not have a power switch. The platform has four power connectors; each powers a power module. As viewed from the rear of the JCS 1200 platform, power connector 1 (top-right connector) supplies power to power module bay 1, power connector 2 (bottom-left connector) supplies power to power module 2, power connector 3 (top-left connector) supplies power to power module 3, and power connector 4 (bottom-right connector) supplies power to power module 4 (see Figure 1).
Figure 1: Direction of Power from Power Connectors to Power Modules on the JCS 1200 Platform
Power modules 1 and 2 are redundant and provide power to Routing Engine bays 1 through 6; power modules 3 and 4 are redundant and provide power to Routing Engine bays 7 through 12. To ensure power redundancy, a typical power configuration is to supply power to power connectors 1 and 4 from one power source location while supplying power to power connectors 2 and 3 from another power source location. The power domains are shown in Figure 2.
Figure 2: Logical View of Power Domains on the JCS 1200 Platform
Note: The release handles on the fan shuttle have a safety switch that disables power output from the power boxes. If the release handles are not secured to the chassis with the thumbscrews, the JCS 1200 platform will not power on.