Endace Measurement Systems Limited
http://www.endace.com
EDM01.05-12r1 DAG 3.7T Card User Manual
Copyright, all rights reserved.
33
Version 6. 22 September 2005.
5.2.3 Card with Reference Time Synchronization
, continued
Testing signal
For Linux and FreeBSD, when a synchronization source is connected, the
driver outputs some messages to the console and 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 synchronization (PPS) signals.
5.3 Synchronization Connector Pin-outs
Description
DAG cards have an 8-pin RJ45 connector with two bi-directional RS422
differential circuits, A and B. The PPS signal is carried on circuit A, and
the serial packet is connected to the B circuit.
Pin assignments
The 8-pin RJ45 connector pin assignments are:
1. Out
A+
2. Out
A-
3. In
A+
4. In
B+
5. In
B-
6. In
A-
7. Out
B+
8. Out
B-
Figure
Figure 6-1 shows the RJ45 plug and socket connector pin-outs.
Figure 6-1. RJ45 Plug and Socket Connector Pin-outs.
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