Airflow Through The Chassis; Ptx1000 Fan Module Leds; Figure 15: Airflow Through The Ptx1000 Chassis (Port-To-Fru) - Juniper PTX1000 Hardware Manual

PTX1000 Fan Module LEDs

Copyright © 2018, Juniper Networks, Inc.
NOTE: All three fan modules must be installed for optimal operation of the
PTX1000. The PTX1000 continues to operate for a limited period of time
(30 seconds) during the replacement of the fan module without thermal
shutdown.

Airflow Through the Chassis

In the PTX1000 cooling system, cool air enters through the vents in the port panel and
hot air exhausts through the FRU panel. This type of airflow is known as airflow out or
port-to-FRU airflow. When the chassis is installed, it must be positioned so that the FRUs
are next to the hot aisle. Figure 15 on page 35

Figure 15: Airflow Through the PTX1000 Chassis (Port-to-FRU)

NOTE: Under normal operating conditions, the fan modules operate at a
moderate speed. Temperature sensors in the chassis monitor the temperature
within the chassis. The system raises an alarm if a fan module fails or if the
ambient temperature inside the chassis rises above the acceptable range. If
the temperature inside the chassis rises above the threshold temperature,
the system shuts down automatically.
The PTX1000 has status LEDs for each fan module on the left side of the corresponding
fan module slot. Figure 16 on page 36
module on the PTX1000 FRU panel.
TIP: You can check the status of fan modules by using the
command.
shows the airflow through the chassis.
shows the location of the LED next to the fan
Chapter 1: Overview
show system alarms
35