[ntp:questions] project ntp.br
Antonio M. Moreiras
moreiras at nic.br
Mon Oct 8 14:05:13 UTC 2007
François Meyer escreveu:
> For real time purposes (as NTP), formally this is
> UTC(ONRJ), TA(ONSP) and TA(ONBR) (just formal, no
> practical consequences if only NTP is concerned).
Could you indicate some sources (books, websites) where I could learn
more about that? We are writing some documentation in portuguese and I
would like to get all the formalities correctly handled.
>
> I cant see why you need a Rb clock here if UTC(ONRJ)
> (or a slightly degraded version in the case of the
> secondary observatories) is available locally.
>
There are issues regarding the ONRJ Internet connections. Because of
this, the primary and secondary ntp servers are in other site (althought
it is also in Rio de Janeiro).
> No remark on the structure below stratum 1, but from
> a metrological point of view, in my opinion, the
> complete structure could read like this :
>
> UTC
> |
> |Circular T BIPM
> |
> |
> UTC(ONRJ) ---------------> NTP st 1, id 0 ---> down to lower strata
> | |
> | peer
> | |
> |__________TA(ONSP) ---> NTP st 1, id 1---> down to lower strata
> | GPS link |
> | peer
> | |
> |__________TA(ONBR) ---> NTP st 1, id 2 ---> down to lower strata
> GPS link
>
Thanks for the suggestion! We are studying alternatives, including this
one, as we see that our proposed structure have big problems.
[]s
Antonio M. Moreiras.
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