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Author
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Topic: Barco projector internal clock is 30 minutes slower than actual time
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Leo Enticknap
Film God
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 09-27-2018 09:33 PM
An ICP's real time clock (which is the clock a Series 2 Barco uses, unless it has an Alchemy ICMP in it) can be reset without that DCI limit, so I'm guessing that either you're referring to the clock in the server (or IMS) as distinct from the projector, or your projector has a Barco Alchemy ICMP in it.
Either way, the short-term solution is to obtain a patch from the server or IMS manufacturer (if you do have an Alchemy, from Barco), which will enable a one-time change of the clock without limits.
However, for many (if not all) manufacturers, the only way that one-time change can be done is by fetching the time from an NTP server on boot-up. With no patch installed, if the NTP reports a time that is greater than six minutes out, the system will generate an "out of budget" error message, and the time will not be changed. However, if the patch has been uploaded immediately before the reboot, it will allow a variance of greater than six minutes to be set for that one bootup only.
So it looks like you need two things:
- The patch from the manufacturer - An NTP server on the management LAN to sync from.
Once you've set that up, it should be set and forget: as the secure clock drifts a bit, it will be reset from the NTP server on each bootup. The only problem is if the clock is so bad that it drifts more than six minutes in a year, in which case you need to repatch every time you run through your secure clock's "budget" of six minutes every year.
The Alchemy and the Dolby cat745 IMB often do. I've had to patch at least a dozen of each in the 16 months I've been working as a service tech, and one IMS3000 (I don't think the IMS3000 is that prone to drifting: the one I had to patch had been sitting in its box for 18 months between delivery and installation). Other Dolby and Doremi secure clocks, and most GDCs, don't seem to drift much at all. I haven't had to patch any. The Dolby cat862 seems to be extremely accurate: I recently serviced one that had never been synced to an NTP server in the seven years it had been in service, and its secure clock was less than two seconds out from UTC. It had also spent long periods of time powered down.
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Leo Enticknap
Film God
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 09-28-2018 04:40 PM
quote: Mark Gulbrandsen If he had a GDC they will just remote in and correct it for you live.
Correct me if I'm wrong, but isn't the letter of the DCI law that management LANs in digital cinema installations should not have any physical connection to the Internet, even indirect (e.g. a PC with two NICs)? If so, then if GDC will only correct clock drift by remoting in, then presumably they expect their servers to be used in a way that violates DCI rules (though admittedly, that particular rule is very widely violated).
As I say, I've never encountered an out-of-budget GDC secure clock, but always assumed that they would give you a patch for offline ingest, just as Dolby and Barco do.
quote: Dave Macaulay you have to ingest the patch file (a license file, nit sure if it's sent as a KDM or what) and change the clock by 6 minutes towards what you want, then repeat the process.
Sorry - forgot that the Alchemy patch only lets you do six minutes per reboot cycle.
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