Juniper Networks G10 CMTS manual Power Supplies, Power Supply LEDs

Chassis

•Power Supplies

•
•		Power supplies are available in either AC or DC input voltage models. You must specify a
•		model when ordering a G10 CMTS. The power supplies and the chassis are mechanically
•		keyed to ensure that the same types are used together.
•
•		If you order an AC version of the CMTS without power redundancy, the CMTS ships with five
•		AC power supplies installed in domain A. If you order the CMTS with power redundancy, the
•		CMTS ships with 10 AC power supplies installed. DC versions of the CMTS are always shipped
•		with 10 DC power supplies installed.
•
•		Power redundancy provides input power redundancy as well as N+1 power supply
•		redundancy. You must supply power from different circuits to domain A and domain B for
•		power redundancy protection. However, the VDC outputs of each power supply are available
•		to all chassis modules through the power bus in the midplane.
•
•		An AC power supply front panel is shown in Figure 11 on page 27. The power supplies are in
•		a standard 3 U housing with a 160 mm depth and a 40 mm front panel width. The power
•		supplies install from the front of the chassis (see Figure 4 on page 11) and plug into the PS1
•		through PS10 connectors on the midplane (see Figure 9 on page 23). Power supplies are
•		hot-swappable.
•
•		Since a power supply is half the depth of the other modules in the front of the card cage, the
•		power supplies sit recessed in the chassis bay. A removable faceplate installs over the front
•		opening.
•
•		The power supply front panel contains two indicator LEDs—POWERand FAULT. Table 6 on
•		page 26 explains the significance of these LEDs.
•
•
•	Table 6: Power Supply LEDs
•
•		POWER	FAULT	Meaning
•
		Green	Not illuminated	Normal operation
•
•		Green	Red	! Over-temperature
•				! Over-current or over power
•				limit condition
•		Not illuminated	Red	Voltage input failure
•
		Not illuminated	Not illuminated	! Power supply not installed
•
				correctly
•				! No input power and no DC
•
				output from other power
•				supplies to illuminate FAULT
•				LED
•
•		If the power supply is operating in a degraded mode due to an increase in its temperature, a
•
•		warning event is generated (if enabled). If the temperature rises to the over-temperature
•		shutdown limit, the FAULT LED is illuminated and a critical event is generated (if enabled).
•		Temperatures above the over-temperature shutdown limit cause the power supply to shut
•		down. See the JUNOSg Software Configuration Guide: Interfaces, Cable, Policy, and Routing and
•		Routing Protocols for more information on event configuration.

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26 JUNOSg 3.0 G10 CMTS Hardware Guide