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T4000 LED Overview


Craft Interface LEDs

The craft interface displays system status messages and allows you to troubleshoot the router. See T4000 Craft Interface LEDs.

LEDs on the craft interface include:

  • Red and yellow alarm LEDs

  • FPC LEDs

  • Host subsystem LEDs

  • SIB LEDs

Component LEDs

The following LEDs are located on various router components and display the status of those components: