Fan Trays; Figure 13: Airflow Through The T320 Chassis - Juniper Core Router T Series Hardware Manual

T320 Core Router Hardware Guide

Figure 13: Airflow Through the T320 Chassis

Fan Trays

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NOTE: The standard fan trays and quiet fan trays are not interchangeable
with each other. All fans in the chassis must be either standard fan trays or
quiet fan trays.
The cooling system contains the following fan trays:
One rear fan tray cools the components installed in the rear card cage (the Routing
Engines, control boards, SCGs, and the SIBs). The T320 router supports the following
types of rear fan trays:
The standard rear fan tray with five blowers (EOL) is supported by Junos OS 5.4 and
later. It has no label and is not interchangeable with the standard front fan trays.
The quiet rear fan tray, labeled
OS 11.1 and later,, contains eight fans and is not interchangeable with the quiet front
fan trays.
One upper front fan tray and one lower front fan tray that cool the components installed
in the front card cage (the FPCs, PICs, CIP, and midplane). The T320 router supports
the following front fan trays:
The upper and lower standard front fan trays, each of which contain six fans and
have no labels. Both standard fan trays are interchangeable with each other.
Each quiet front fan tray contains four fans, as indicated by the four fan icons on the
faceplate.
NOTE: The quiet upper front fan tray and quiet lower front fan tray are
not interchangeable with each other. In addition to the labels, the quiet
upper fan tray also has an upward pointing arrow above the four fan
icons on the faceplate.
REAR FANTRAY FAN-R-S and supported by Junos
Copyright © 2018, Juniper Networks, Inc.