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1 - 8 ONline 17-Slot System Concentrator Installation and Operation Guide
Fault-Tolerance Capabilities
The ONline System Concentrator provides fault tolerance through
redundant features, such as an optional backup power supply, backup
controller module, redundant cable links, and backup concentrator
capability.
Backup Power Supply
An optional second power supply can be used to backup the primary
power supply in case of a power failure. Should the primary power supply
fail, the backup power supply takes over automatically. In addition, once a
backup power supply has been installed, you can replace a failed primary
power supply without shutting down the system.
Load Sharing
The load-sharing function provides uninterrupted power to modules
installed in a concentrator with two power supplies. If the active power
supply fails, the concentrator automatically switches to the other power
supply without interrupting the network.
The following ONline 17-Slot System Concentrators have load-sharing
capability:
❑ Model 5017C-LS
❑ Model 5017C with load-sharing upgrade
To determine if your model 5017C concentrator has load-sharing hardware,
check the rear of the concentrator chassis for a label reading “Upgraded
w/30-0286.” If this label is present, the concentrator has received the
load-sharing upgrade.
In order for load sharing to work, the Fault-Tolerant Controller Module
model 5000M-RCLS must be installed. This controller monitors the
concentrator's load-sharing function.