D-Link DGS-3630 Series Hardware Installation Manual page 39

DGS-3630 Series Layer 3 Stackable Managed Switch Hardware Installation Guide
The figure below illustrates how switches can be stacked in a Duplex Ring formation using optical fiber cables
connected to SFP+ transceivers or DAC with SFP+ connectors where the 2-port stacking configuration is used.
NOTE: Stacking Input/Output 1 (SIO1) is a logical stacking port pair. SIO2 is also a logical stacking
port pair. A logical stacking port pair must always be connected to the same Switch in the stack.
Splitting logical stacking port pairs between different Switches in the stack might not guarantee a
stable stacking connection.
Figure 4-4 Duplex Ring stacking topology (SFP+)
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