3Com 3C780 User Guide - Page 167

6 Glossary Primary path Primary ring Ring Ring wrap SAC SAS SDDI Secondary ring SMT The segment(s) of the primary ring that pass through a station. Conditions may exist in parts of the network that may cause the path to be in a different ring (that is, secondary instead of primary). In the dual counter-rotating token ring architecture, the ring that carries data traffic. A set of stations through which information is passed sequentially between stations, each station in turn examining or copying the information, until the information is returned to the originating station. The ring reconfiguration that takes place when a break occurs in the primary ring and the dual attached hubs and stations on either side of the fault detect and automatically bypass it. Single Attachment Concentrator. A concentrator that connects a single ring only (usually the primary ring) to the FDDI network. Single Attachment Station. A station that offers a single attachment to the FDDI network. The connection is to one ring only (usually the primary ring), and that attachment is made through a concentrator; there is no direct attachment to the trunk ring. Shielded [Twisted-Pair] Distributed Data Interface. FDDI over shielded twisted-pair per the SDDI de facto STP standard. In the dual counter-rotating token ring architecture, the ring that is generally used for automatic recovery in the event of a break in the primary ring. Station Management. The function within an FDDI node responsible for managing, maintaining, and controlling all the local and remote station functions.