Kenneth Rainer Corley, Dave Barker

Earlier today we went to CERX, CERY, and MSR to perform TDR length measurements on some 1PPS cables used for the timing diagnostic system (to compare our timing system's signal to independent watchdog clocks).

**This will have NO IMPACT on anything outside of timing diagnostics.**

The four affected timing diagnostic channels will have outages in their signals lasting a few minutes:

H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_2
H1:SYS-TIMING_C_MA_A_PORT_2_SLAVE_CFC_TIMEDIFF_3
H1:SYS-TIMING_Y_FO_A_PORT_9_SLAVE_CFC_TIMEDIFF_3
H1:SYS-TIMING_X_FO_A_PORT_9_SLAVE_CFC_TIMEDIFF_3

The disconnected/measured cables were the CNS II diagnostic GPS clocks at CERX/Y, the diagnostic symmetricom GPS clock at MSR, and the NTP server in MSR.