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Introduction 1 - 9
Backup Controller Module
The controller is vital to the system because it performs important functions
including:
❑ synchronizing all modules
❑ monitoring concentrator conditions (temperature, power supply
status, etc.)
❑ recognizing failures
❑ clocking and timing to the ONline Concentrator backplane
By using two 3Com Fault-Tolerant Controller Modules (5000M-RCLS) in
your concentrator you can protect these critical tasks if a controller fails.
Note: You cannot use the 5000M-RCTL or 5000M-CTL controller
in a load-sharing concentrator (Model 5017C-LS or Model
5017C with load-sharing upgrade).
Redundant Cable Links
Cable breaks or failures are the most common problem in any network.
Using the ONline Ethernet Fiber Module in your ONline System
Concentrator enables you to implement full cable redundancy for your
network's backbone. Thereafter, if one port should fail, or if a cable is
disconnected or cut, the backup port will take over in 100 milliseconds. A
sample redundant network connection is shown in Figure 1-6.