Endace DAG 9.2X2 - Page 63

EDM01-36v10 DAG_9.2X2_Card_User_Guide - Synchronizing clock time
©2010 - 2012 Endace Technology Ltd. Confidential - Version 10 - May 2012 57
Dagclock output explained
Muxin
Lists the dagclock time input source for this DAG card. The options are RS422in, Hostin, Overin or
Auxin.
Example
muxin rs422
Muxout
Lists the dagclock time output source for this DAG card. The options are RS422out, Hostout,
Overout or Loop.
Example
muxout none
Status
This line reports on the status of the DAG card.
Output Description
Synchronised /
Not
synchronised
This indicates whether this DAG card is synchronized to the time source listed (Muxin).
The DAG card becomes Synchronised when the absolute Phase error (page 57) is within
the Threshold value for 10 consecutive seconds.
The DAG card becomes Not Synchronised when the absolute Phase error (page 57) is
above the Threshold value for 10 consecutive seconds.
Threshold
This is the value above which the DAG card port is considered Not Synchronised.
The Threshold value changes depending on the type of input time synchronization. The
defaults are:
• 596 for RS422 synchronization
• 12000 for host synchronization (Unix)
• 50000 for host synchronization (Windows)
This value can be adjusted using the
dagclock -l
option.
Failures
This is a count of the number of times the DAG card has become Not Synchronised.
Resyncs
This is a count of the number of times the DAG card Phase error has exceeded 1 second. See
Error (page 57).
If the DAG card is Not Synchronised for more than 10 seconds the DAG card automatically
runs the following command to update the time on the DAG card:
dagclock -dX set
(Where X is the device number of the DAG card you want to configure).
Example
status Synchronised Threshold 596ns Failures 0 Resyncs 0
Error
This line reports on the synthesized frequency of the DAG card.
Output Description
Freq
An estimate of the synthesized frequency error over the last second in parts per billion.
Phase
The difference between the DAG card's clock and the reference clock at the last time pulse.
Worst Freq
Highest absolute value of the Frequency error since statistic collection began. Reset to zero
when statistics are reset, see Dagclock Statistics reset (page 56).
Worst Phase
Highest absolute value of the Phase error since statistic collection began. Reset to zero when
statistics are reset, see Dagclock Statistics reset. (page 56)
Example
error Freq -30ppb Phase -60ns Worst Freq 75ppb Worst Phase 104ns