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JCS1200 Platform Hardware Components

Default Hardware Configuration

The default configuration for the JCS1200 platform includes:

• One JCS management module
• One JCS switch module
• Four power supplies
• One media tray

Routing Engines

The JCS chassis provides 12 slots (bays) for Routing Engines. A Routing Engine is a hot-swappable, independent server with its own processors, memory, storage, network controllers, operating system, and applications. The Routing Engine is installed in a slot in the JCS chassis and shares power, fans, switches, and ports with other Routing Engines. Routing Engines in the JCS1200 platform have the latest JUNOS Software preinstalled on them.

Management Module

The JCS management module is a hot-swappable module that you use to configure and manage JCS components. The JCS chassis comes with one hot-swappable management module in management module slot 1. To provide redundancy, you can add a second management module in management module slot 2. Only one management module is active. The other is a backup in case of failure. Each JCS management module has a separate internal link to each JCS switch module. See Figure 1.

Figure 1: JCS Management Module

You can access the JCS management module CLI through a local connection to the serial port on the JCS management module. Or, you can access the CLI from a remote network management station on the network through the console (Ethernet) connector.

Switch Module

The JCS switch module connects Routing Engines on the JCS1200 platform to a T Series router and controls traffic between the two devices. The JCS chassis comes with one hot-swappable switch module in switch module slot 1. To provide redundancy, you can add a second switch module in switch module slot 2.

Media Tray

The media tray is a hot-swappable module that provides two USB connectors for use by the Routing Engines, error LEDs, an ambient air temperature sensor and a pressure sensor for use by the JCS management module, and two CompactFlash card slots. JUNOS Software is preloaded onto each Routing Engine. The media tray USB ports are used to copy new JUNOS Software packages onto Routing Engines. See Figure 2. The JCS chassis comes with one hot-swappable media tray in media tray slot 1. To provide redundancy, you can add a second media tray in media tray slot 2.

Figure 2: JCS Media Tray

Power Supply Modules

The JCS chassis is configured with four hot-swappable power supply modules. The power supply modules in slots 1 and 2 supply power to Routing Engine slots 1 through 6, media trays 1 and 2, management module slots 1 and 2, and switch module slots 1 and 2. Power supply modules in slots 3 and 4 supply power to Routing Engine slots 7 through 12.

Each pair of power modules operates as a redundant pair. If either power module fails, the remaining power module continues to supply power, but there is no redundancy. Replace a failed power module as soon as possible.

Fan Modules

The JCS1200 platform comes with four hot-swappable fan modules for cooling redundancy. The fan module speeds vary depending on the ambient air temperature within the JCS1200 platform.

If the ambient temperature is 25°C (77°F) or below, the JCS1200 platform fan modules will run at their minimum rotational speed. If the ambient temperature is above 25°C (77°F), the fan modules will run faster, increasing their speed as required to control internal JCS1200 platform temperature.

Each fan module contains two fans operating as a pair in a series. If one fan fails, the remaining fan will run at full speed and continue to cool the JCS1200 platform. To maintain cooling redundancy, replace a failed fan module as soon as possible.