DGS-1520 Series Gigabit Ethernet Smart Managed Switch Hardware Installation Guide
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In the following diagram, switches are stacked in the Duplex Ring topology using the two 10GBASE-T ports.
Figure 4-2 Duplex Ring Stacking Topology
Physical stacking needs to be enabled and can be configured to support a 2-port or 4-port stacking configuration.
SIO1 (Stacking Input/Output 1) and SIO2 are logical stacking port pairs. 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.
The following table lists the stacking configuration with the corresponding SIO port pairs:
Configuration Switch Logical SIO1 Logical SIO2 Bandwidth
2-port 10GBASE-T DGS-1520-28
Port 25 Port 26 40 Gbps (full-duplex)
DGS-1520-28MP
Port 25 Port 26 40 Gbps (full-duplex)
DGS-1520-52
Port 49 Port 50 40 Gbps (full-duplex)
DGS-1520-52MP
Port 49 Port 50 40 Gbps (full-duplex)
2-port SFP+ DGS-1520-28
Port 27 Port 28 40 Gbps (full-duplex)
DGS-1520-28MP
Port 27 Port 28 40 Gbps (full-duplex)
DGS-1520-52
Port 51 Port 52 40 Gbps (full-duplex)