Maintaining The T4000 Air Filters; Figure 141: Airflow Through The Chassis - Juniper T4000 Hardware Manual

T4000 Core Router Hardware Guide
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Maintaining the T4000 Air Filters

Purpose
Action
334
On a regular basis:
Check the SCG LEDs. During normal operations:
The green OK LED on the SCG faceplate is lit.
The yellow LED on the SCG faceplate is not lit. If the yellow
FAIL
"Troubleshooting the T4000 SCGs" on page
Use the
show chassis environment scg
T4000 SONET Clock Generators (SCGs) Description on page 20
T4000 SONET Clock Generators (SCGs) LEDs on page 22
For optimum cooling, verify the condition of the air filters.
Air filters for both the front and rear fan trays help keep dust and other particles from
entering the cooling system. To function properly, the entire cooling system requires an
unobstructed airflow and proper clearance around the site, as described in
Clearance Requirements for Airflow and Hardware Maintenance" on page
Figure 141 on page 334.

Figure 141: Airflow Through the Chassis

Check the air filters regularly for dust and debris. As a general guideline, we recommended
that you replace the filter elements every 6 months for routers operating in a typical
environment. The filter elements degrade over time, and replacement intervals will vary
by operating environment.
349.
command to verify the status of the SCGs.
Copyright © 2018, Juniper Networks, Inc.
LED is lit, see
FAIL
"T4000
91. See