Test Procedure Working Groups » IEC 61850 TPWG » Test Procedure Issues » Server

It is "obvious" (to me) that because clause 4.1.3 of UCATestProceduresGoosePerformanceEd2_Rev2p5.pdf says for the time correlated subscribed GOOSE:
Retransmission at 4, 32 and 256 ms (or more) that it is means that GPFsubscribed1 has an incremented state number ONLY at time= -4 ms; and not at -4 and -2 and 0 and 2 and 4 ms.
Similarly GPFsubscribed2 does not have incremented state numbers at -4 or 0 or +2 or +4.

This results in exactly 6 time-correlated subscribed GOOSE messages centered upon relative time 0 ms (both GPFPPpingNormal and GPFsubscribed3 are sent at 0 ms).
To produce the most accurate measurements, it is assumed that GPFPPpingNormal is sent slightly before GPFsubscribed3 to avoid queuing issue on the Ethernet media. In other words, the specification implies "these are simultaneous" but sending first the GPFsubscribed3 GOOSE would add a delay to the PING-PONG GOOSE name GPFPPpingNormal.

For the above, please substitute GPFPPpingLarge for tests Gpf4 and Gpf8.

Thank you Bruce.

I propose to change the "5 subscribed GOOSE each having one .... used for ping-pong" to the following words:

5 subscribed GOOSE each having one state change of the 5th data value element approximately as following before and after the subscribed GOOSE state change used for ping-pong:
At -4ms: subscribed GPFsubscribed1 GOOSE change status of 5th data
At -2ms: subscribed GPFsubscribed2 GOOSE change status of 5th data
At 0ms: subscribed GPFPPing GOOSE change the status and followed by subscribed GPFsubcribed3 GOOSE change status of 5th data
At 2ms: subscribed GPFsubscribed4 GOOSE change status of 5th data
At 4ms: subscribed GPFsubscribed5 GOOSE change status of 5th data