Patrick T.

This evening, sometime between 7:00 and 9:00 PM, I found the cover replaced on the Corner MSR EtherCAT chassis. It is labelled with serial number S1103490 and is on a cart near the back of the network timing rack in the MSR. I had left the cover off because I was afraid that it was pinching the fibers inside, and might be causing communications errors that I had seen earlier. I had replaced the orange multimode fiber going into the EK1521 terminal when these errors last occurred, and that had appeared to fix them. That was the second time I had replaced that fiber. The first time I had replaced the EK1521 terminal as well, which had serial number 20110311 and was put it in a box labelled 'broken? 4/8/2013'. I believe that had also appeared to fix similar errors at the time.

I removed the cover. Looking inside I found that part of the top of the white flexible connector on the multimode fiber labelled 'B' going into the EK1521 terminal, was broken off. This appeared to have been done purposefully. The other fiber of the pair, labelled 'A', appeared to be slightly split at the top. The temperature probe that had been placed inside the chassis had also been put outside. The cover would have been closed on its wire, but not too tightly, as it was not screwed down. I am leaving the cover off for the night and the rest of the chassis as I otherwise found it.