• Supported Platforms
• T640 Routers

• Related Topics
• T640 Host Subsystem Description
• Taking the T640 Host Subsystem Offline
• Maintaining the T640 Routing Engines
• Maintaining the T640 T-CBs
• Replacing the T640 Host Subsystem Components

Maintaining the T640 Host Subsystem

Purpose

For optimum router performance, verify the condition of the host subsystem. The host subsystem comprises a Routing Engine and up to two adjacent T-CBs functioning together.

Action

On a regular basis:

• Check the host subsystem LEDs (HOST0 and HOST1) on the craft interface. If the red HOST0 FAIL or HOST1 FAIL LED is lit, look at the LCD to get more information about the cause of the problem. For more information about the LEDs and the display, see T640 Craft Interface Description.
• Check the LCD on the craft interface to view information about the status of the Routing Engines and control boards.