Technical Documentation
T640 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.
 | Note: Before you replace most host subsystem components, such as a control board or Routing Engine, you must take the host subsystem offline. However, it is not necessary to halt the host subsystem to insert or remove a PC card. You must power off the Routing Engine before replacing a CompactFlash card or solid-state disk in a Routing Engine. |
Table 1 lists the FRUs for the router.
Table 1: Field-Replaceable Units
Hot-Removable and Hot-Insertable FRUs | Hot-Pluggable FRUs |
|---|---|
Air filters Flexible PIC Concentrators (FPCs) Front and rear fan trays Physical Interface Cards (PICs) Power supplies Backup SONET Clock Generators (SCGs) Switch Interface Boards (SIBs) Master control board (if nonstop active routing is configured) Backup control board Backup Routing Engine | Connector Interface Panel (CIP) Nonredundant control board Master control board (if nonstop active routing is not configured) Nonredundant Routing Engine Master Routing Engine (if nonstop active routing is not configured) Master and nonredundant SCGs |
