Juniper Networks M10i manual Power Supplies, PIC Offline Buttons, Alarm LEDs

Chapter 2: Hardware Component Overview

Table 10 on page 19 describes the alarm LEDs in more detail.

Table 10: Alarm LEDs

Shape	Color	State	Description
	Red	On steadily	Critical alarm LED—Indicates a critical condition
			that can cause the router to stop functioning, such
			as component removal, failure, or overheating.
	Yellow	On steadily	Warning alarm LED—Indicates a serious but nonfatal
			error condition, such as a maintenance alert or a
			significant increase in component temperature.

PIC Offline Buttons

Offline buttons for one row of PICs are located on each HCM (see Figure 6). Pressing the button relays a request to the CFEB, which prepares the PIC for removal from the router, or brings it online when it is replaced. The HCM in slot 0 controls PICs on FPC 0. The HCM in slot 1 controls PICs on FPC 1. The buttons are labeled with the PIC slot numbers. The PIC slots on the upper FPC are numbered from 0/0 (zero/zero) through 0/3, right to left. The PIC slots in the lower FPC are numbered from 1/0 (one/zero) through 1/3, right to left.

For PIC replacement instructions, see “Replacing a PIC” on page 96.

Power Supplies

The router uses either AC or DC power. You can install up to four load-sharing power supplies at the bottom rear of the chassis, as shown in Figure 2. The power supplies connect to the midplane, which distributes power to router components according to their individual voltage requirements. When the power supplies are installed and operational, they automatically share the electrical load.

An enable control pin on the output connector of each power supply ensures that the supply is fully seated into the router midplane before the supply can be turned on. The enable pin prevents a user-accessible energy hazard, so there is no interlocking mechanism. The enable pin disables the voltage at the output connector if the power supply is not turned off before removal.

The router must have at least two AC power supplies, and any two AC power supplies can provide full power to the router. Three power supplies are required for redundancy.

The router must have at least two DC power supplies, and any two DC power supplies can provide full power to the router. DC system redundancy requires two power sources from feed A and two power sources from feed B. If one feed fails or is shut down for service, the other feed powers two DC power supplies and can provide full power to the router's components indefinitely.

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