Chassis and Power Supplies
Redundant AC Circuit Recommendation
OmniSwitch 8800 Hardware Users Guide
December 2004
page 2-25
Redundant AC Circuit Recommendation
It is recommended that each AC outlet resides on a separate circuit. With redundant AC, if a single circuit
fails, the switch’s remaining power supplies (on separate circuits) will likely be unaffected and can there-
fore continue operating.
Note.
The switch must have power supply redundancy for the redundant AC circuit to be effective. Refer
to
“1375 Watt DC-to-DC Power Supply” on page 2-15
for more information.
The diagram below shows a simple redundant AC circuit scenario.
Redundant AC Circuit Example
OK1
OK2
OS8800-SFM
OK1
OK2
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
5
In the event of a failure at AC Circuit 1
(for example, a tripped circuit breaker),
the power supply plugged into the
grounded outlet on AC Circuit 2 is unaf-
fected.
Four power supplies are installed in an
OS8800 chassis, providing valid power
supply redundancy (see
In this example, power supplies PS1 and
PS3 are installed on separate circuits—
AC Circuit 1 and AC Circuit 2, respec-
tively.
AC Circuit 2
AC Circuit 1
OK1
OK2
OS8800-SFM
OK1
OK2
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
50/60Hz, 8.0 A
230V
AC OK
DC OK
TEMP
FAIL
!
CAUTION:
THIS UNIT MAY BE EQUIPPED
WITH FOUR POWER SUPPLIE CORDS. TO REDUCE
THE RISK OF ELECTRICAL SHOCK, DISCONNECT
ALL POWER SUPPLY CORDS BEFORE
SERVICING UNIT.
ATTENTION:
CET APPAREIL COMPORTE
PLUS D'UN CORDON D'ALIMENTATION. AFIN DE
PREVENIR LES CHOCS ELECTRIQUES, DEBRANCHE
TOUS LES CORDONS D'ALIMENTATION AVANTE DE
FAIRE LA REPARATION.
5
AC Circuit 2
AC Circuit 1
!
