Endace DAG 9.2X2 - Page 64

EDM01-36v10 DAG_9.2X2_Card_User_Guide - Synchronizing clock time
58 ©2010 - 2012 Endace Technology Ltd. Confidential - Version 10 - May 2012
Crystal
This line reports on the DAG card crystal oscillator.
Output Description
Actual
The DAG card's crystal frequency calculated based on the reference clock.
Synthesized
The target time stamping frequency. Different for each DAG card type.
Example
crystal Actual 100000028Hz Synthesized 67108864Hz
Input
This line reports on the time pulses received by the DAG card.
Output Description
Total
The total number of time pulses received. Reset to zero when statistics are reset, see
Dagclock Statistics reset (page 56).
Bad
The number of time pulses that were rejected (considered Bad) by the DAG card. Reset to
zero when statistics are reset, see Dagclock Statistics reset (page 56).
When the DAG card is Synchronised a time pulse is considered Bad if it exceeds the
Threshold.
Time pulses are considered Bad if they were not received 1 second (approximately) after the
last time pulse. This may be caused by noise.
Singles missed
The number of times a single time pulse failed to be received by the DAG card (i.e. a two
second gap).
Reset to zero when statistics are reset, see Dagclock Statistics reset (page 56).
Longest
Sequence Missed
This displays the longest time gap (in seconds) between a pair of time pulses. Reset to zero
when statistics are reset, see Dagclock Statistics reset (page 56).
Example
input Total 3765 Bad 0 Singles Missed 5 Longest Sequence Missed 1
Start / Host / DAG
Output Description
Start
This is the time statistics collection started. See Dagclock Statistics reset. (page 56)
Host
Current Host (computer) time.
DAG
The DAG card time at the last time pulse. If the DAG card has never been synchronized, the
following displays:
No active input - free running.
Example
start Thu Apr 28 13:32:45 2007
host Thu Apr 28 14:35:35 2007
dag Thu Apr 28 14:35:35 2007