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We have tested differential DS link connections over twisted-pair cable for immunity against electromagnetic interference according to the IEC 801-4 standard [10]. The setup passed test severity level 2, which corresponds to the environment likely to be found in the control room of an industrial or electrical plant. We have also attempted to quantify the reliability of DS link systems using the 1024 node grid network by performing long-term error tests. The 1024 node grid contains a total of 1344 active DS links, about one third of these link use differential buffers and 2 meter twisted pair cables. The others are single-ended on-board connections. We have run the system continuously for over 200 hours without observing any link errors. This translates to a per-link error rate of better than .

Roger Heeley
Fri Sep 26 17:00:08 MET DST 1997