3Com S7906E Getting Started Manual page 16

The system power consumption of a switch is determined by its SRPUs, LPUs, and fan tray. Specifically,
the system power consumption of a switch is equal to the power consumption of its SRPUs, LPUs, and
fan tray put together.
For how to install power modules and power module adapters, refer to section 5.2 "Removing and
Installing a Power Module."
Table 1-5 Compatibility matrix between power modules and switch chasses
Chassis (right)
Power module
(below)
PSR320-A Y
PSR320-D Y
PSR650-A Y
PSR650-D Y
PSR1400-A N
PSR1400-D N
PSR2800-ACV N
Y means that the power module fits the chassis.
N means that the power module cannot be used in the chassis.
Do not use different types of power modules in the same device.
PSR320-A
Figure 1-9 PSR320-A power module
(1) Power cable retainer
(3) Power switch
(5) Power module handle
As shown in the figure, above the power switch is the power LED. If the power LED is green, the power
supply operates normally. If the LED is red, the power supply is abnormal.
S7902E S7903E-S
Y
Y
Y
Y
N
N
N
1-10
S7903E S7906E
N N
N N
N N
N N
Y Y
Y Y
Y Y
(2) AC power socket
(4) Power LED
(6) Captive screws
S7906E-V S7910E
N N
N N
N N
N N
Y Y
Y Y
Y Y