Endace DAG 5.2X, User Manual

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EDM01-33v1 DAG_7.5G4_Card_User_Guide
46 ©2008 Endace Technology Ltd. Confidential - Version 1 - November 2008
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 Not Synchronized when the absolute
Phase error (page 46)
is
above the
Threshold
value for 10 consecutive seconds.
Threshold This is the value above which the DAG card port is considered Not Synchronized .
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 Synchronized.
Resyncs This is a count of the number of times the DAG card Phase error has exceeded 1 second.
See Error (Dagclock) 46 (page ).
If the DAG card is Not Synchronized for more than 10 seconds the DAG card
automatically runs the following command to update the time on the DAG card:
dagclock -d0 set
Where "0" is the device number.
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 45 (page ).
Worst Phase
Highest absolute value of the
Phase error
since statistic collection began. Reset to zero
when statistics are reset, see Dagclock Statistics reset. 45 (page )
Example
error Freq -30ppb Phase -60ns Worst Freq 75ppb Worst Phase 104ns