Juniper QFX Series Hardware Guide

Table 39: Chassis Alarm Messages (continued)
Recommended ActionCLI MessageAlarm TypeComponent
Replace the power supply with a power
supply that supports the same airflow
direction as supported by the chassis.
PEM pem-number Airflow not matching
Chassis Airflow
Major (red)Power supplies
Check the system log for one of the
following error messages and report the
message to customer support:
•
I2C Read failed for device number,
where number where number ranges
from 123 through 125.
•
PS number: Transitioning from online to
offline, where power supply number is
1 or 2.
PEM pem-number I2C Failure
Check the power cord connection and
reconnect, if necessary.
PEM pem-number is not powered
Replace the power supply with a
supported power supply.
PEM pem-number is not supported
Indicates a problem with the incoming
AC power or outgoing DC power. Report
the error to customer support.
PEM pem-number Not OK
Reboot the switch after removing one of
the power supply. The switch can
continue to operate with a single power
supply.
OR
Replace the removed power supply and
reboot the switch.
PEM pem-number AbsentMinor (yellow)
Check whether there is a mix of AC and
DC power supplies in the same chassis.
Reboot the switch with only AC or only
DC power supplies.
PEM pem-number Power Supply Type
Mismatch
Replace the removed power supply or
reboot the switch. The switch can
continue to operate with a single power
supply.
PEM pem-number Removed
Copyright © 2019, Juniper Networks, Inc.128
QFX5110 Switch Hardware Guide

Juniper QFX Series Specifications

General

Category	Switch
Series	QFX
Form Factor	1U, 2U, and modular chassis options
Power Supply	Redundant, hot-swappable power supplies
Cooling	hot-swappable fans
Virtual Chassis	Supported on certain models
Typical Use	Data center, cloud
Operating System	Junos OS
Management	CLI
Key Features	High performance, low latency, automation
Latency	Sub-microsecond latency
Port Density	Varies by model (e.g., QFX5100: up to 48x10GbE + 6x40GbE)