Last updated: December 3, 2008
The neighbour cell synchronization trigger is useful for synchronizing other network simulating equipment to the test set for E-OTD testing. See E-OTD (Enhanced Observed Time Difference) for more information.
This trigger is provided at the rear panel TRIG OUT connector.
Control of the synchronization trigger is available only by using a GPIB command. There is one configurable parameter which allows you to determine when the trigger is fired. See CALL:TRIGger[:OUTPut]:FRAMe:SYNChronize:OFFSet .
After the test set receives the GPIB command to generate the synchronization trigger, the test set's frame count is set to 2715448. This frame occurs 200 frames before the end of the hyperframe. When the trigger is generated depends on the offset you have specified. If no offset is defined, the trigger is generated when the first symbol of the next hyperframe occurs which is when the frame count becomes 0. Otherwise, the trigger is generated before the first symbol of the next hyperframe by the number of symbols specified in the offset.
It is important to ensure that the other triggers provided by the test set are disabled before sending the synchronization trigger. An additional signal at the trigger output interferes with the synchronization process.
Use the CALL:TRIGger[:OUTPut][:ALL]:STATe:OFF to disable all triggers before sending the synchronization trigger command.
CALL:TRIGger[:OUTPut]:FRAMe:SYNChronize
CALL:TRIGger[:OUTPut]:FRAMe:SYNChronize:OFFSet