For loss of sync, I was referring to the data stream, not the video. I should have chosen a better explanation.
When TV is not responding, I don't really care what STB does.
The STB CAN'T do anything if the TV is not responding. If it did, this would imply that there is no security on the signal. The TV HAS to send back data to comply with the security issues to allow video to pass from the STB.
I care about when TV goes from inactive to active, 3250 should reinitiate HDCP hand shake instead of ignore it.
Yes it should. The TV HAS to send the signal that it is active again. If the TV never sends that data, the STB will never know to reinitiate the hand shake. Without this back and forth checking, you could plug the DVI into an HDCP device, get video, and then disconnect the signal and pull the video stream into a non-compliant device to circumvet the security. That is the reason for the TWO-WAY data to ensure each device is really there and talking.
My guess is 3250 continues to deliver encrypted video all the time regardless.
It does, until the TV sends back an "All OK for HDCP" signal. Then the STB sends some video packets, and another "check for HDCP" signal. The TV gets the video packets and the "check for HDCP" data. If the TV sends back the "All OK for HDCP" again, the process continues. If the TV does NOT send back the "All OK for HDCP" data, the STB will STOP sending Video and ask for the handshake again. The TV then has to respond to the handshake and the process starts over again.
Without a proper HDCP handshake, the TV simply can not decode the video or simply think the video data as un-encrypted. Hence the snow screen.
Without the handshake or the return of an "All OK for HDCP" type of message from the TV.