If I created the impression that PSIP has anything to do with Data Event Tables, I created the wrong impression. They're similar, but PSIP applies only to audio/video or audio only services. John Willkie -----Original Message----- From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Kon Wilms Sent: Saturday, May 15, 2004 11:53 AM To: opendtv@xxxxxxxxxxxxx Subject: [opendtv] Re: Serivces and Applications >The truth is that BEFORE there can be data broadcasting of wide utility, there needs to be a navigation infrastructure. PSIP does that for DTV, and equipment that transmits Data Event Tables (etc) does that for data. My interests extend even beyond that. That's debatable. All data broadcasting systems use some form of service discovery - usually a fixed PID carrying metadata which describes other PIDs and channels to receive data on, and drills down further to arrival, synopsis, and other data elements. It's all well and good that PSIP does that, but you can't take a datacasting system built on PSIP annoucements and use it without modification on a DVB or WiFi network. Hence going back to metadata on the IP level and using a fixed PID being the most flexible approach if one wants one system that can be deployed over any IP-capable transport. There are some initiatives to carve out universal datacasting announcement mechanisms for different OS's. I won't mention names but I have usually had the distinct impression that these forums are usually a 'teach us how to do this' ruse. Just my 2c. Cheers Kon ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.