3Com 3C780 User Guide - Page 35

Typical FDDI Ring Setups

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Overview 1-9 Typical FDDI Ring Setups The hub can be used singly or in groups to bring FDDI to the desktop. Figure 1-3 shows a typical ring setup, in which: s Two dual attachment stations (DAS) are connected to the trunk ring. s Two dual attachment hubs (DAC) are connected to the trunk ring. s Two single attachment stations (SAS) are connected to each of the hubs. NOTE: 3Com uses the standard acronym DAC (for dual attachment concentrator) shown above but calls the concentrator a hub rather than a concentrator. DAS 1 DAS 2 DAC 1 BA DAC 2 BA SAS 1 SAS 2 SAS 3 Figure 1-3. Physical Topology for Typical FDDI Ring SAS 4

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1-9
Overview
Typical FDDI Ring Setups
The hub can be used singly or in groups to bring FDDI to the desktop.
Figure 1-3 shows a typical ring setup, in which:
■
Two dual attachment stations (DAS) are connected to the trunk ring.
■
Two dual attachment hubs (DAC) are connected to the trunk ring.
■
Two single attachment stations (SAS) are connected to each of the hubs.
NOTE:
3Com uses the standard acronym DAC (for dual attachment
concentrator) shown above but calls the concentrator a hub rather than a
concentrator.
DAS 1
SAS 1
SAS 2
DAS 2
SAS 3
SAS 4
DAC 1
DAC 2
B
A
B
A
Figure 1-3.
Physical Topology for Typical FDDI Ring