56 SunFDDI/P1.0 Adapter User’s Guide—May 1997
6
FDDI Stations
An FDDI station is any device that can be attached to a fiber or copper twisted-
pair FDDI network through an FDDI interface. The FDDI protocols definetwo
types of FDDI stations:
•Single-attached station (SAS)
•Dual-attached station (DAS)

Single-Attached Station (SAS)

A single-attached station (SAS) is attached to the FDDI network through a
single connector called the S-port. The S-port has a primary input (Pin) and a
primary output (Pout). Data from an upstream station enters through Pin and
exits from Pout to a downstream station, as shown in Figure6-4.
Single-attached stations are normally attached to single- and dual-attached
concentrators, as described in “FDDI Concentrators” on page 58.
Figure6-4 Single-Attached Station (SAS)
Single-attached station
(SAS)
Pin
Pout Data from upstream station
Data to downstream station
MAC
PHY
S-port