Allied Telesis SwitchBlade 4000 Series Switch Hardware Reference - Manual (Page 9)

Hardware Reference 9
C613-03060-00 REV H
Dual Power Feed Connections
In the default mode, power feed1 supplies power to PSU 1 and PSU 2, and
power feed 2 supplies power only to PSU 3. Power feed redundancy is
provided as follows:
■ If power is disconnected from power feed 2, then PSU 1 and PSU 2 will
continue to supply power from power feed 1.
■ If power is disconnected from feed 1, then the relay will switch to
disconnect PSU 2 from power feed 1 and reconnect it to power feed 2. DC
power will then be provided via PSU 2 and PSU 3.
Power Supplies
The SwitchBlade chassis and power supplies offer a number of options such as
hot swapping that provide varying degrees of resiliency and recovery.
See “Power Feed Options” on page 8, “AT-SB4161 & 2 SwitchBlade Power
Supply Units” on page 19, and “How Many PSUs do You Need?” on page 33.
DC
GOOD
FAN
GOOD
POWER
PRESENT
AT-SB4162 AC POWER SUPPLY
DC
GOOD
FAN
GOOD
POWER
PRESENT
AT-SB4162 AC POWER SUPPLY
DC
GOOD
FAN
GOOD
POWER
PRESENT
AT-SB4162 AC POWER SUPPLY
DC
GOOD
FAN
GOOD
POWER
PRESENT
AT-SB4162 AC POWER SUPPLY
DC
GOOD
FAN
GOOD
POWER
PRESENT
AT-SB4162 AC POWER SUPPLY
Power Feed 1
Relay
Power Feed 2
PSU 1 PSU 2 PSU 3