Endace DAG 3.7D, User Manual

Page: 28 / 33

EDM01-06: DAG 3.7D Card User Guide
©2006 22 Version 1: March 2006
dag@endace:~$ dagclock –d dag0
muxin rs422
muxout none
status Synchronised Threshold 596ns Failures 0
Resyncs 0
error Freq 30ppb Phase -15ns Worst Freq 2092838ppb
Worst Phase 33473626ns
crystal Actual 100000023Hz Synthesized 67108864Hz
input Total 225 Bad 0 Singles Missed 1 Longest
Sequence Missed 1
start Thu Apr 28 14:55:20 2005
host Thu Apr 28 14:59:06 2005
dag Thu Apr 28 14:59:06 2005
Connecting the Time Distribution Server
The TDS 2 module connects to any DAG card with a standard RJ-45
Ethernet cable and can be placed some distance from a DAG card.
Existing RJ-45 building cabling infrastructure can be used to cable
synchronisation ports.
The TDS-2 and the DAG card synchronisation port should never be
connected to Ethernet or telephone equipment.
CAUTION: Never connect a DAG card and/or the TDS 2 module to
active Ethernet equipment.
Testing the Signal
For Linux and FreeBSD, when a synchronisation source is connected the
driver outputs some messages to the console log file
/var/log/messages
.
The
dagpps
tool is used to test a signal is being received correctly and is
of correct polarity. To perform the test, run:
dagpps –d /dag0.
The tool measures input state many times over several seconds, displaying
polarity and length of input pulse.
Some DAG cards have LED indicators for synchronisation (PPS) signals.