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GFK-1527A Chapter 1 Introduction 1-7
1
Enhanced Hot Standby CPU Redundancy System with Local I/O
The following illustration is an example of an Enhanced Hot Standby CPU Redundancy system
with Local I/O in standard Series 90-70 expansion racks.
C
P
U
B
T
M
R
C
M
G
B
C
30
Secondary Unit
Primary Unit
31
P
S
P
S
S
C
A
N
N
E
R
REMOTE DROP
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
P
S
B
T
M
G
B
C
L
O
B
C
K
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
P
S
C
P
U
B
R
M
RACK 0
RACK 1
RACK 0
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
P
S
RACK 6
LOCAL I/0
CAN BE IN
RACKS
0 - 6
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
I
O
B
R
M
R
C
M
I/O CABLE WITH BUILT-IN TERMINATION
IC697CBL811 (10 FEET (3m))
IC697CBL826 (25 FEET (7.5m))
*
*
TERMINATED I/O CABLE
TERMINATED I/O CABLE
*
---
---
IC697CBL803 (3 FEET (0.9m))
Note
Rack 7 is not available for I/O modules in an Enhanced Hot Standby CPU
Redundancy system.