| 摘要 |
<p>The invention concerns a contra-rotating ring data communications network interconnecting a plurality of terminals (20, 21, 22), the network having primary and secondary data paths (10, 11). During normal operation the primary data path (10) and the secondary data path (11) are interconnected at one terminal in such a manner that the contra-rotating ring (10, 11) becomes a single ring with data travelling in both paths. The primary and secondary data paths (10, 11) are preferably optical fibres. Each terminal may include two media access controllers each associated with a pair of encoder/decoder circuits. In such a case the ring is twisted into the form of a Mobious loop (37) so that the two media access controllers of each terminal are located topologically as far apart in the ring as is possible.</p> |
