Redundant AC Circuit Recommendation
Chassis and Power Supplies
page 2-28
OmniSwitch 7700/7800 Hardware Users Guide
April 2005
Redundant AC Circuit Recommendation
If possible, 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 therefore continue operating.
Note.
The switch must have power supply redundancy for the redundant AC circuit to be effective. Refer
to
“600 Watt DC-to-DC Power Supply” on page 2-14
for more information.
The diagram below shows a simple redundant AC circuit scenario using an OS7700 switch.
OS7700 Redundant AC Circuit Example
OVER
TEMP
DC OK
AC OK
50/60Hz, 8.0/7.0/3.5 A
100/115/250V
OVER
TEMP
DC OK
AC OK
50/60Hz, 8.0/7.0/3.5 A
100/115/250V
OVER
TEMP
DC OK
AC OK
50/60Hz, 8.0/7.0/3.5 A
100/115/250V
OS7700-CMM
EMP
LINK
ACT
CONSOLE
/MODEM
OK1
OK2
PRI
SEC
TEMP
FAN
OS7700-CMM
EMP
LINK
ACT
CONSOLE
/MODEM
OK1
OK2
PRI
SEC
TEMP
FAN
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OmniSwitch 7700
TM
1
2
3
4
A
B
5
6
7
8
NI
NI
CMM
PWR
PS3
PS2
PS1
In the event of a failure at circuit 1 (for
example, a tripped circuit breaker), the
redundant power supply plugged into the
grounded AC outlet on circuit 2 allows
switch operations to continue.
AC Circuit 1
AC Circuit 2
OVER
TEMP
DC OK
AC OK
50/60Hz, 8.0/7.0/3.5 A
100/115/250V
OVER
TEMP
DC OK
AC OK
50/60Hz, 8.0/7.0/3.5 A
100/115/250V
OVER
TEMP
DC OK
AC OK
50/60Hz, 8.0/7.0/3.5 A
100/115/250V
OS7700-CMM
EMP
LINK
ACT
CONSOLE
/MODEM
OK1
OK2
PRI
SEC
TEMP
FAN
OS7700-CMM
EMP
LINK
ACT
CONSOLE
/MODEM
OK1
OK2
PRI
SEC
TEMP
FAN
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-GNI-U2
OK1
OK2
ACT
LINK
ACT
LINK
RX
TX
RX
TX
1
2
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OS7-ENI-C24
1x
3x
5x
7x
9x
11
x
13x
15x
17x
19x
21x
23x
OK1
OK2
22x
20x
18x
16x
14x
12x
10x
8x
6x
4x
OmniSwitch 7700
TM
1
2
3
4
A
B
5
6
7
8
NI
NI
CMM
PWR
PS3
PS2
PS1
Two power supplies are installed in an
OS7700 chassis, providing valid power
supply redundancy (see
Each power supply is installed on a sep-
arate circuit.
AC Circuit 1
AC Circuit 2
!
