Digitally Synchronized Rings
Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15
For high-speed serial data communications in a ring-like network, it is difficult to keep the various nodes (stations) synchronized. There are two types of synchronization: analog synchronization and digital synchronization. Analog synchronization uses phase-locked loops (PLLs) and comb filters taking the form of, say, surface acoustical wave (SAW) filters which work well up to high data rates at least for point-to-point connections. Digital phase-locked loops are well-known for point-to-point connections and lower speeds. For ring-like structures and high data rates, digital synchronization still appears to be in the development stage, although it is preferably used, as it simplifies critical device parameters and permits high integration.