Troubleshooting The M320 Cooling System - Juniper M320 Hardware Manual

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Troubleshooting the M320 Cooling System

Copyright © 2015, Juniper Networks, Inc.
Table 79: SONET/SDH Interface Alarm Messages (continued)
LED Display Message
interface-name so-x/x/x PMIS
interface-name so-x/x/x PRDI
interface-name so-x/x/x REI
interface-name so-x/x/x SEF
interface-name so-x/x/x UNEQ
M320 Craft Interface Alarm LEDs and ACO/LT Button on page 16
The M320 router cooling system comprises two front and one rear fan tray (see
Chassis Description" on page
interchangeable. The rear fan tray contains seven fans and is not interchangeable with
the front trays. The front fan trays cool the components installed in the front card cage
(the FPCs, PICs, CIP, and midplane). The rear fan tray cools the components installed in
the rear card cage (the Routing Engines, CBs, and the SIBs). Each power supply has two
fans that cool that power supply.
router.
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
Preparation Checklist Requirements" on page
Chapter 32: Troubleshooting Components
CLI Message
interface-name so-x/x/x - SONET path mismatch
interface-name so-x/x/x - SONET path remote defect
indicator
interface-name so-x/x/x - SONET remote error indicator
interface-name so-x/x/x - SONET severely errored frame
interface-name so-x/x/x - SONET unequipped
7). The front fan trays each contain four fans and are
Figure 117 on page 288
85.
"M320
shows the airflow through the
"M320 Site
287