EDM01-36v10 DAG_9.2X2_Card_User_Guide
ii ©2010 - 2012 Endace Technology Ltd. Confidential - Version 10 - May 2012
Using your DAG card 37
Introduction ..........................................................................................................................................37
Basic data capture .................................................................................................................................37
Starting a capture session ...................................................................................................................37
dagsnap .............................................................................................................................................38
Capturing data at high speed...............................................................................................................39
Viewing captured data ...........................................................................................................................40
dagbits...............................................................................................................................................40
dagbits tests .......................................................................................................................................42
Converting captured data .......................................................................................................................43
dagconvert .........................................................................................................................................43
Using third party applications .................................................................................................................47
Transmitting captured data ....................................................................................................................47
Configuration......................................................................................................................................47
Explicit packet transmission .................................................................................................................47
Trace files ..........................................................................................................................................48
TR TERF .............................................................................................................................................48
Synchronizing clock time 51
Overview...............................................................................................................................................51
DUCK configuration................................................................................................................................51
Common synchronization .......................................................................................................................51
IRIG-B................................................................................................................................................51
Network Time Protocol ...........................................................................................................................52
Timestamps...........................................................................................................................................53
Example .............................................................................................................................................53
Readable DUCK .....................................................................................................................................54
Reading the current DAG time .............................................................................................................54
Performance .......................................................................................................................................54
Dagclock ...............................................................................................................................................55
Card with timing reference .....................................................................................................................59
Overview ............................................................................................................................................59
Pulse signal from external source.........................................................................................................59
Testing the signal ...............................................................................................................................59
Single card no reference.........................................................................................................................60
Two cards no reference..........................................................................................................................61
Overview ............................................................................................................................................61
Synchronizing with each other .............................................................................................................61
Synchronizing with host.......................................................................................................................61
Connector .............................................................................................................................................62
Overview ............................................................................................................................................62
Pin assignments..................................................................................................................................62
Data formats 65
Overview...............................................................................................................................................65
Generic ERF header ...............................................................................................................................66
ERF 2. TYPE_ETH ..................................................................................................................................68
Extension Headers (EH) .........................................................................................................................69
Introduction........................................................................................................................................69
Guidance for stream buffer sizing 71
Selecting stream buffer size....................................................................................................................71
Burst duration.....................................................................................................................................71
Latency ..............................................................................................................................................72
Multiple streams ....................................................................................................................................72
Calculating the stream buffer size ...........................................................................................................72
Example 1 ..........................................................................................................................................73
