[EMAIL PROTECTED] wrote: > Hi Yaakov, > > I can comment on the electric power and instrumentation bit. Each power > grid sub-station has a large number of monitoring devices. These devices > historically have been served time via IRIG-B distributed time systems. The > substations will typically have a gps receiver for time and 1pps to drive > the IRIG generators. the backhaul networks are usually private circuit > based networks. In past years many of these were on SNA or some other > similar network. As these substations are upgraded they are being > implemented with local LAN's and will have time distribution systems based > on 1588 or ntp. This allows the removal of the IRIG systems. The backhaul > networks can then be migrated to packet based with whatever access makes > sense for each location. The time distribution systems are local to the > substations. > > In test and measurement the LXI forum, LAN extensions for Instrumentation, > has mandated the use of 1588 for compliance. Again this is a local time > distribution paradigm with a local time source.
I'd be interested in understand why 1588 was mandated for compliance. There's nothing wrong, per se, with that, but understanding the rationale would be helpful. Information on the error budget requirements and frequency, jitter, etc. would be also be useful. Given the mandate what would TICTOC offer that would improve on that and how? > > Many of the "time" based event correlation systems use a local source of > time, typically gps, for time stamps. This is then sent in non-real time to > the monitoring systems for overall system correlation processing. I agree > with your thought that most of these are not applicable to the TICTOC work. > What is being captured and what accuracy is required for these results? Danny > Hopefully this info is helpful. > > Pat _______________________________________________ TICTOC mailing list [email protected] https://www.ietf.org/mailman/listinfo/tictoc
