Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
The article describes a technique (called Short Order Poll) that allows a station on a local area network (LAN) to determine the identity of the next active upstream neighbor (NAUN). The technique requires a short-order poll request MAC frame and a short-order poll response MAC frame. The technique can be used by both an inserting and de-inserting station. The figure shows a LAN with a plurality of stations connected thereto. For an inserting station, the process requires the following steps: 1.Upon insertion, station I broadcasts a short-order poll request MAC frame with the NAUN sub-vector containing a null value. 2.Station A copies the frame and turns on the ARI/FCI bits. Other stations on the ring will ignore the broadcast frame because the frame has been copied by A. 3.Station A then enters short-order poll mode. 4.