Looking at the dmesg kernel messages on h1cdsrfm shows it sees an issue with IXH Adapter 2 (EY). It does not report it as operational. Since corner station to EY data is functional, presumably this is a partial failure of the IX611 card at EY. Looks like a power cycle of h1cdsrfm and the EY adnaco chassis is the next thing to try.
controls@h1cdsrfm ~ $ dmesg |grep "IXH Adapter 0"|grep oper
[ 58.163158] IXH Adapter 0 : Link 0 is operational - Link width: x8 - PCIe Gen 2 -- Downtime: 0 sec
controls@h1cdsrfm ~ $ dmesg |grep "IXH Adapter 1"|grep oper
[ 58.168059] IXH Adapter 1 : Link 0 is operational - Link width: x8 - PCIe Gen 2 -- Downtime: 0 sec
controls@h1cdsrfm ~ $ dmesg |grep "IXH Adapter 2"|grep oper
NO Response from last command
For the lay-person IXH Adapter 2 = dolphin network switch (maybe?) IX611 card = long range dolphin network card in side the h1cdsrfm computer. EY adnaco chassis = where the dolphin to long range fiber conversion happens