In the topology illustrated in Figure 4, an AT-FS709FC is used to connect together eight 10/100 Mbps Ethernet hubs. This type of topology is often referred to as a collapsed backbone topology. The switch functions as the focal point for all workgroup hubs in your network, acting as a bridge between the different workgroups. The switch transfers an Ethernet frame from hub to hub only when the destination node for the frame is on a different hub than the node that originated the frame. This reduces the amount of unnecessary data traffic in each workgroup, which frees up bandwidth and improves network performance.
| | FS709FC POWER | | | | | | | | | 1X | 2X | 3X | 4X | 5X | 6X | 7X | 8MDI-X | 8MDI | | | AT-FS709FC | |
10BASE-T / 100BASE-TX 8 PORT FAST ETHERNET SWITCH WITH 100FX UPLINK | LINK/ACT | | | | | | | | | | | | | | | | | | 9 | | |
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| | | | 100M | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | FDX | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | | | | | | | | OR | | | | | | | |
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| | Ethernet Hub | | | | | | | | | | | | | | | | Ethernet Hub | |
8 | 7 | 6 | 5 | 4 | 3 | | | 2 | | | | 1 | | | | | | | | | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
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| | Ethernet Hub | | | | | | | | | | | | | | | | Ethernet Hub | | |
8 | 7 | 6 | 5 | 4 | 3 | | | 2 | | | | 1 | | | | | | | | | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
| | | | | | | | | | | | | | | | | | | | |
| | Ethernet Hub | | | | | | | | | | | | | | | | Ethernet Hub | | |
8 | 7 | 6 | 5 | 4 | 3 | | | 2 | | | | 1 | | | | | | | | | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
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| | Ethernet Hub | | | | | | | | | | | | | | | Ethernet Hub | | |
8 | 7 | 6 | 5 | 4 | 3 | | | 2 | | | | 1 | | | | | | | | | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
Figure 4 Collapsed Backbone — Hub Topology
