1. Spirent Test Center Implementation Enhancement For Asynchronous Timer Traffic January 2016

2. Brief instructions Applies to asynchronous traffic setting
Select the “Duration mode” as “Seconds”
Simplifies messaging between BLL and IL
True difference between sync and async start-stop
True asynchronous start-stop in asynchronous mode
Old:
BLL gets timestamp from IL and calculates delay time then start
IL adjusts duration when unreasonable
New:
BLL sends start command immediately
IL exactly applies the duration once the FPGA is prepared
Adaptable to all test modules

3. Related configuration

4. Comparison OLD NEW Emission starts at the same time
Start Emission Setup
New
Start Emission Setup
Port 1
Port 1
Port 2
Port 2
Port 3
Port 3
Time
Time
Emission starts at the same time
Emission starts at best effort, therefore asynchronous

5. Async Timer Implementation
Async Timer Implementation Enhancement ended us with the following flow:
Before the Enhancement, Flow was as follows:

6. Async Timer Implementation
After the Enhancement, Flow becomes as below:
No GetTimestamp request is sent. And SetSyncStartStopPara request has new format, in which async mode is added and start time is set to zero.

7. Thank You