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5-94 Reference Guide
Model No.
Running Head
CPU Card Redundancy System Configuration and Operation
5.28 CPU Card Redundancy
CPU card redundancy is valuable because the CPU card is essential to system operation. CPU
redundancy is supported using two CPU-7 XCON (CPU). The CPU card in slot C2 will be the
redundant card for the CPU XCON card in slot C1, but only if they are both the same type
with the same level of Host Code, for example 7.5.x. For redundancy, the first two digits of
the Host Code must be the same, but the last digit does not matter.
A switch from one CPU card to the other is triggered by any of the following:
• A software command issued by an operator
• Removal of the active CPU card from the system
• Failure or malfunction of the active CPU card
During a CPU redundancy switch over, disruptions to voice and data traffic are possible but
momentary and traffic will recover automatically.
Figure 5-76 shows a System Main Screen with redundant CPU cards. The card in slot C1 is
active, and the card in slot C2 is redundant. To switch operation to the redundant CPU card,
press “w” to invoke the cpusWtch command from the bottom highlighted line of this screen.
The system prompts you with a yes/no confirmation prompt, as shown.
Figure 5-76.Manually Switching to a Redundant CPU
At the prompt, press “y”. The CPU card in slot C2 is now active, and the CPU card in C1 is
redundant (RDNT status), as shown in Figure 5-77. These states remain in effect on both cards
until you manually switch back to the CPU card in slot C1.