Null Attachment Hub; Null Attachment Hub (Nac) And Connected Stations - 3Com 3C780 - LinkBuilder FDDI Base Unit User Manual

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
NAC
M
M
SAS
SAS
Figure 3-4. Null Attachment Hub (NAC) and Connected Stations (SAS and DAS)
DAS
M M M
M M M
Configuring the Hub
SAC
S M M
SAS
3-5
M