Understanding the Control Board ! 303
Chapter 22: Monitoring the Control Board
Understanding the Control Board
Purpose Inspect the Control Boards to ensure that control and monitoring functions occur
for the router.
What Is the Control
Board
The Control Board works with an adjacent Routing Engine in the host subsystem on
M320 and T320 routers and the T640 routing node to provide control and
monitoring functions. These functions include determining Routing Engine
mastership, controlling power, performing reset and SONET clocking for the other
router components, monitoring and controlling fan speed, and monitoring system
status using I
2
C controllers.
M320 Router Control Board
Figure 124 shows the Control Board component used on the M320 router.
Figure 124: M320 Router Control Board Component
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External
clock
connections
Online/offline
button
Extractor clip
LEDs
B
A
E
X
T
E
R
N
A
L C
L
O
C
K
IN
P
U
T
S
C
B
-M
M
A
S
T
E
R
F
A
IL
O
K
Extractor clip
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