Daniel, Jim, Dave:

Following our discovery yesterday that the LSC receive errors of ISC RFM IPC data was zeroed when the ASC computer was removed from the RFM loop, this afternoon we changed the h1asc.mdl model to remove the 16 obsolete RFM channels  to see if that changed the LSC error rate. It did, it has zeroed it. The attached strip tool plot shows the LSC error rate for the 4 ISC RFM channels (2 per end station). The ASC change was made at the 35 minute mark in the 1 hour long X-axis. I have a cron job running on sysadmin0 which clears the errors every minute, the strip tool is updating every 15 seconds.

This is a temporary band-aid fix for the LSC. If we were to put the 16 IPC channels back into the ASC (8 per arm) the error will re-appear. We will attempt to reproduce the error on the DTS and work at a long term solution.

Here are the ASC sender RFM IPC channels which were removed. I verified that no other model is showing RFM receive errors, confirming these are senders with no associated receviers.

H1:ASC_PZT[1,2][X,Y]_[PIT,YAW]_ISCE[X,Y] 8 in total

H1:ASC_ISCE[X,Y]_QPD[1,2]_[PIT,YAW] 8 in total