Optical Ila Cooling System Description - Juniper PTX3000 Hardware Manual

Table 6: Optical ILA RJ-45 Management Port LEDs (continued)
LED
Status
RELATED DOCUMENTATION
Optical ILA AC Power Supply Description | 31
Optical ILA DC Power Supply Description | 32

Optical ILA Cooling System Description

IN THIS SECTION
Fan Modules | 30
The cooling system in an optical ILA consists of three 12.4-W fan modules installed in the field-replaceable
unit (FRU) panel and two counter-rotating fans housed in each of the power supplies.
In the optical ILA's cooling system, cool air enters through the vents in the front panel and hot air exhausts
through the fans in the FRU panel. This type of airflow is known as airflow out or front-to-back airflow.
When installed, the chassis must be positioned so that the FRUs are next to the hot air exhaust.
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.
Color
Unlit
Green
State
Off
On steadily
Blinking
Description
Link is down.
Link is up.
There is data activity.
29