Troubleshooting The M320 Cooling System - Juniper M320 Hardware Manual

Related
Documentation

Troubleshooting the M320 Cooling System

Copyright © 2010, Juniper Networks, Inc.
Table 21: SONET/SDH Interface Alarm Messages (continued)
LED Display Message
interface-name so-x/x/x LRDI
interface-name so-x/x/x PAIS
interface-name so-x/x/x PLL
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
Connecting the M320 Router to Management and Alarm Devices on page 91
M320 Craft Interface Alarm LEDs and ACO/LT Button on page 28
The M320 router cooling system comprises two front and one rear fan tray (see "M320
Chassis Description" on page 6). The front fan trays each contain four fans and are
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. Figure 62 on page 130 shows the airflow through the
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 "M320 Site
Preparation Checklist Requirements" on page 41.
Chapter 12: Troubleshooting M320 Router Hardware Components
CLI Message
interface-name so-x/x/x - SONET line remote defect
indicator
interface-name so-x/x/x - SONET path AIS
interface-name so-x/x/x - SONET PLL lock
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
129