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1 - 12 ONline 17-Slot System Concentrator Installation and Operation Guide
Synchronous Backplane
The ONline System Concentrator backplane is designed with all passive
components to achieve the maximum reliability. The synchronous
backplane allows the concentrator to be connected (using the 3Com
ONline Fiber Module) without the need for internal repeaters. This avoids
the limitations of the Ethernet four-repeater rule and lets you connect up to
23 concentrators serially, without the need for an intervening repeater or
bridge.