Sun Microsystems 1.0 User Manual
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.
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.
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