Endace DAG 3.7G Series, User Manual

Page: 28 / 34

EDM01-07: DAG 3.7G Card User Guide
Version 7: May 2006 22 ©2005
Two Cards No
Reference
(cont.)
Synchronising with Each Other
Although the master card’s clock will drift against UTC, the cards will still be
locked together. This is achieved by connecting the time synchronisation
connectors of both cards using a standard RJ-45 Ethernet cross-over cable.
Configure one of the cards as the master so that the other defaults to being a
slave as follows:
dagclock –d dag0 none overout
muxin none
muxout over
status Not Synchronised Threshold 596ns Failures 0 Resyncs 0
error Freq 0ppb Phase 0ns Worst Freq 0ppb Worst Phase 0ns
crystal Actual 100000000Hz Synthesized 67108864Hz
input Total 0 Bad 0 Singles Missed 0 Longest Sequence Missed 0
start Thu Apr 28 14:48:34 2005
host Thu Apr 28 14:48:34 2005
dag No active input - Free running
Note: The slave card configuration is not shown as the default
configuration will work.
Synchronising with Host
To prevent the DAG card clock time-stamps drifting against UTC, the master
can be synchronised to the host PC’s clock which in turn utilises NTP. This
then provides a master signal to the slave card.
Configure one card to synchronize to the PC clock and output a RS-422
synchronization signal to the second card as follows:
dagclock –d dag0 none overin overout
muxin over
muxout over
status Synchronised Threshold 11921ns Failures 0 Resyncs 0
error Freq -691ppb Phase -394ns Worst Freq 143377ppb Worst Phase
88424ns
crystal Actual 49999354Hz Synthesized 16777216Hz
input Total 87464 Bad 0 Singles Missed 0 Longest Sequence Missed 0
start Wed Apr 27 14:27:41 2005
host Thu Apr 28 14:59:14 2005
dag Thu Apr 28 14:59:14 2005
The slave card configuration is not shown, the default configuration is
sufficient.