JUNOS Internet Software Network Operations Guide: Hardware
250 ! Replacing the Power Supplies
Figure 104 shows the location of the DC power supply serial number ID label for the
T640 routing node. The serial number ID label is located on the left side of the
power supply faceplate.
Figure 104: T640 Routing Node DC Power Supply Serial Number Label
Replacing the Power Supplies
The power supplies are hot-removable and hot-insertable. You can remove or
replace a power supply without powering down the system and disrupting routing
functions.
However, you must power down the power supply before removing it from the
router. When one power supply is powered down, the other power supply
automatically assumes the entire electrical load for the router.
Action To return a failed power supply, see “Return the Failed Component” on page 86. To
replace the power supplies, see the appropriate router hardware guide.
1582
INPUT 1
INPUT 0
-48V -48VRETURN
RETURN
O
V
E
R
T
E
M
P
C
B
O
N
D
C
O
K
C
B
T
R
IP
SP04461A
S/N : MJ10276
REV: 03
REV: C
082901
P/N : 740-002595
Serial number ID label
NOTE: The circuit breaker box is not hot-removable or hot-pluggable. You must
power down the router to remove the circuit breaker box.
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