SDH, SONET and WDM systems are often configured in self-healing rings.
Der Ring des Nibelungen | Ring of Honor | The Fellowship of the Ring | The Ring (magazine) | Ring of Fire | The Ring | Ring | The Lord of the Rings: The Fellowship of the Ring | ''The Ring'' | Bull Ring, Birmingham | The Promise Ring | Ring 2 | Twin Ring Motegi | Ring Round the Moon | E-Ring | Bull Ring | Sheffield Inner Ring Road | Scarff ring | Ring of Fire (song) | Ring Lardner | One Ring | Ku-ring-gai Council | Healing | World Series ring | Tub Ring | St Martin in the Bull Ring | Sexual Healing | Ring of Bright Water | Ring ni Kakero | Ring (film) |