Measuring Latency with IxExplorer

     Measuring Latency with IxExplorer requires some good knowledge  of  stream transmission techniques  used by the product ( instrumetation, packets groups, statistics management.

I will present on short how this is done using  a single stream  transmitted  between 2 ports in loop.

In order to measure latency we are going to send a stream  from port 1/1 to port 1/2 in you configuration. You  will need to make sure that the stream contains the signatures and PGIDs at the same offset on both  Tx and RX side.

 Steps to configure

Connect  to IxExplorer, login and take ownership on ports 1/1 and 1/2

I. Configuration of the TX port

Configure a stream on  port 1/1 and check the offset for signature and PGIDs ( they should be set the same on Rx side)

Right click on Advanced Streams Window and chose to create a new stream

Double click on the stream and on Frame Data tab  enable Instrumentation for time stamp and packet groups

II. Configuration of the  RX ports

Click on port 1/2 and chose option Filter, Statistics, Receive mode 

On the new window open go to Receive Mode tab and enable Wide Packet Groups. Automaticaly the tabs for  Wide Packets Groups and Latency/Jitter will be available.

On the Wide Packet Group  tab  verify that you have the same instrumentation  set as on the Tx side

 Configure the time bins for your need. Since in our test we have just one stream, one PGID, we will chose to collect for the minimum number of PGIDs

III. Collecting Stats

 Create a Packet Group Statistics View

Add RX port in the view

Start collecting stats

The view display will be something like that