JUNOS Internet Software Network Operations Guide: Hardware
254 ! Understanding the Cooling System
M10i Router Cooling System
The M10i router cooling system consists of two fan trays, located along the left and
right side of the chassis that provide side-to-side cooling. The fan trays house eight
fans that draw room air into the chassis to maintain an acceptable operating
temperature for the Routing Engine, Physical Interface Cards (PICs), Compact
Forwarding Engine Board (CFEB), and other components. The fan trays connect
directly to the router midplane. If a single fan fails, the remaining fans continue to
function indefinitely (see Figure 107).
Figure 107: M10i Router Cooling System and Airflow
For proper airflow, the primary fan tray should be installed in slot 1 (the left slot
looking at the chassis from the rear) and must be installed for proper cooling at all
times. The redundant fan tray, if present, should be installed in slot
0 on the right.
This fan tray provides additional cooling and redundancy.
g002237
Front of chassis
M10i
Redundant fan trayFan tray
Fan tray
6" (15.2 cm)
for airflow
(recommended)
6" (15.2 cm)
for airflow
(recommended)
F
A
N
T
R
A
Y
O
F
A
N
T
R
A
Y
1
N
O
T
E
:
C
-
F
E
B
0
C
-
F
E
B
1
P
/S
3
P
/S
2
P
/S
1
P
/S
0
P
/
S
0
A
N
D
P
/S
1
M
U
S
T
B
E
P
R
E
S
E
N
T
F
O
R
N
O
R
M
A
L
O
P
E
R
A
T
IO
N
.
Redundant
fan tray
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