3Com 3C780 User Guide - Page 73
Null Attachment Hub
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Configuring the Hub 3-5 Null Attachment Hub A null attachment hub (NAC) functions as a self-contained FDDI network. It is an FDDI backbone but is not connected to a dual ring backbone. The network is concentrated in the hub, and all of the attached devices communicate through it using FDDI. Null attachment hubs do not support A, B, or S ports. Figure 3-4 shows a null attachment hub with several connected devices. SAS DAS NAC M M M M M M M M SAS SAS SAC S M M M SAS Figure 3-4. Null Attachment Hub (NAC) and Connected Stations (SAS and DAS)
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3-5
Configuring the Hub
Null Attachment Hub
A null attachment hub (NAC) functions as a self-contained FDDI network.
It is
an FDDI backbone but is not connected to a dual ring backbone.
The network is
concentrated in the hub, and all of the attached devices communicate through it
using FDDI.
Null attachment hubs do not support A, B, or S ports.
Figure 3-4 shows a null attachment hub with several connected devices.
M
M
M
M
SAS
SAS
S
M
M
M
SAS
M
M
M
M
SAC
NAC
SAS
DAS
Figure 3-4.
Null Attachment Hub (NAC) and Connected Stations (SAS and DAS)