M120 Field-Replaceable Units (FRUs)
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.
Table 1 lists the FRUs for the M120 router. If the router contains a redundant host subsystem, the Control Board (CB) and the Routing Engine are hot-removable and hot-insertable. Before you replace a CB or a Routing Engine, you must take the host subsystem offline (see Taking the M120 Host Subsystem Offline).
Table 1: M120 Field-Replaceable Units
Hot-Removable and Hot-Insertable FRUs | Hot-Pluggable FRUs |
|---|---|
Air filter Craft interface Control Board (CB) (if redundant) Routing Engine (if redundant) Forward Engine Boards (FEBs) Flexible PIC Concentrators (FPCs) Compact Flexible PIC Concentrators (CFPCs) AC and DC power supplies (if redundant) Front and rear fan trays Physical Interface Cards (PICs) | Control Board (CB) (if not redundant) Routing Engine (if not redundant) Forwarding Engine Boards (FEBs) (if not redundant) |
