Juniper Networks M10i manual AC System Redundancy, Field-Replaceable Units

M10i Internet Router Hardware Guide

■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 off the router, but the routing functions of the system are interrupted when the component is removed. If a component is acting as a backup, it can be removed without affecting router functions.

■FRUs that require powering off the router—You must power off the router before removing these components.

Table 5 on page 4 lists the FRUs for the M10i router.

Table 5: Field-Replaceable Units

Hot-Removable and		FRUs that require
Hot-Insertable FRUs	Hot-Pluggable FRUs	powering off the router
Fan tray	Compact Forwarding	None
	Engine Board (CFEB)
Physical Interface Card
(PIC)	High-Availability Chassis
	Manager (HCM)
Power supply (AC or DC)
	Routing Engine
Small form-factor pluggable
(SFP)

For FRU replacement instructions, see “Replacing Hardware Components” on page 87.

System Redundancy

You can configure the router for system redundancy by using three AC or four DC load-sharing, fully-redundant power supplies to distribute power to the other components.

AC System Redundancy

AC system redundancy requires three independent AC power outlets. If one power supply fails, the other two power supplies provide full power to the router's components indefinitely.

You can set up increased AC system redundancy by using four AC power supplies. In this case, two power supplies are powered from two AC outlets, and the other two power supplies use two AC outlets from a UPS battery-backed power source. This lets the router run during AC power outages for the amount of time that the UPS allows.

4■ System Redundancy