ASCN timing issue The timing system at ASCN began behaving strangely on 2007:320-10:51. When this occurred, clock lock was lost, so the DAS' oscillator was no longer adjusted to the nominal data rate. After repeated attempts to resolve the problem with the assistance of the station operator, an IDA engineer traveled to the site from June 3-16, 2008. He replaced the DAS and clock but was unable to resolve the problem, which is now believed to be rooted in a grounding issue along the uplink cable. We are now planning to upgrade the data acquisition system and replace the uplink cable sometime in early 2009. Using the station's computer whose own oscillator is disciplined by NTP, it is possible to repair the timing of the data to an accuracy of less than one minute. Because the quality of the waveform data remains high, we have elected to distribute these data with bit 7 of the data quality flag in the fixed section of the SEED data header set to indicate that the time tag is questionable. Data from 2008,177 (June 25th) are distributed in this way. Peter Davis, January 12, 2009