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T320 Field-Replaceable Units


Field-replaceable units (FRUs) are router components that can be replaced at the customer site. Replacing most FRUs requires minimal router downtime. The router uses the following types of FRUs:

  • Hot-removable and hot-insertable FRUs—You can remove and replace these components without powering off the router or disrupting the routing functions.

  • Hot-pluggable FRUs—You can remove and replace these components without powering down the router, but the routing functions of the system are interrupted when the component is removed.

If the router contains a redundant host subsystem, the backup control board (), and the backup Routing Engine are hot-removable and hot-insertable. Before you replace a control board or Routing Engine, you must take the host subsystem offline.

Table 1 lists the FRUs for the T320 Core Router.

Table 1: T320 Field-Replaceable Units

Hot-Removable and Hot-Insertable FRUs

Hot-Pluggable FRUs

  • Craft interface

  • Flexible PIC Concentrators (FPCs)

  • Physical Interface Cards (PICs)

  • Switch Interface Boards (SIBs)

  • SONET Clock Generators (SCGs)

  • Power supplies

  • Front and rear fan trays

  • Air filters

  • Backup control board

  • Backup Routing Engine

  • Routing Engine (if not redundant)

  • Master routing engine

  • Control board (if not redundant)

  • Master control board

  • Connector Interface Panel (CIP)