Sun Microsystems 1.0 - Manual (Page 84)

58 SunFDDI/P 1.0 Adapter User’s Guide—May 1997
6
FDDI Concentrators
FDDI concentrators are multiplexers that attach multiple single-attached
stations to the FDDI ring. An FDDI concentrator is analogous to an Ethernet
hub.
The FDDI protocols define two types of concentrators:
• Single-attached concentrator (SAC)
•
Dual-attached concentrator (DAC)
Single-Attached Concentrator (SAC)
A single-attached concentrator (SAC) is attached to the FDDI network through
a single connector, which is identical to the S-port on a single-attached station.
It has multiple M-ports, to which single-attached stations are connected, as
shown in Figure 6-6.
Figure 6-6 Single-Attached Concentrator (SAC)
Single-attached station
(SAS)
Pin Pout
Data from upstream station Data to downstream station
Single-attached
concentrator
(SAC)
S-port
Single-attached station
(SAS)
S-port
S-port
Single-attached station
(SAS)
S-port
M-port M-port M-port