Juniper Networks T1600 - Manual (Page 7)

Table 1: Components Powered by Each Three-Input 240-A Power Supply Input
Two-Input Mode Three-Input Mode Input
FPCs in slots FPC0 and FPC1 , SIBs, T-CBs,
fan trays, and Routing Engines
T1600-SIBs, T-CBs, fan trays, and
Routing Engines INPUT 0
FPCs in slots FPC2 and FPC7 FPCs in slots FPC4 through FPC7 INPUT 1
Not applicable FPCs in slots FPC0 through FPC3 INPUT 2
Three-Input 240-A Power Supply Load Sharing and Fault Tolerance
When the routing node is operating normally and both power supplies are switched
on, load sharing between them occurs automatically. When one power supply fails
or is turned off, the other power supply immediately assumes the entire electrical
load for the system. A single power supply can provide full power for as long as the
routing node is operational. Table 2 on page 7 describes the behavior of the power
supply if one of the inputs fails.
Table 2: Fault Tolerance
Two-Input Mode Three-Input Mode Input
If this input fails, INPUT 0 and INPUT 1
shut down. The power supply shuts
down, and the other power supply
assumes the electrical load of
INPUT 0
and INPUT 1 .
If this input fails, INPUT 0 , INPUT 1 ,
and INPUT 2 shut down. The power
supply shuts down, and the other
power supply assumes the electrical
load for all three inputs.
INPUT 0
If this input fails, INPUT 0 is
unaffected and INPUT 1 shuts down.
The other power supply assumes the
electrical load of
INPUT 1 .
If this input fails, INPUT 0 is
unaffected and INPUT 1 and INPUT 2
shut down. The other power supply
assumes the electrical load of
INPUT 1
and INPUT 2 .
INPUT 1
Not applicable If this input fails, INPUT 0 is
unaffected and INPUT 1 and INPUT 2
shut down. The other power supply
assumes the electrical load of
INPUT 1
and INPUT 2 .
INPUT 2
Three-Input 240-A Power Supply LEDs
LEDs on each power supply faceplate (see Figure 4 on page 8) indicate the status
of the power supply. In addition, a power supply failure triggers the red alarm LED
on the craft interface. Table 3 on page 8 describes the functions of the power supply
LEDs.
T1600 Upgrade Kit ■ 7
T1600 Upgrade Kit