[ntp:questions] how to have offset < 1ms

Rick Jones rick.jones2 at hp.com
Wed Apr 14 20:43:59 UTC 2010


nemo_outis <abc at xyz.com> wrote:
> However, it would be irresponsible for Unruh and others here not to
> point out that a much better timekeeping solution is readily
> available - a solution which is technically easy to implement.

Slapping a GPS onto a system on land in a "radio transparant"
structure may indeed be technically easy, but is the *solution* here
easy?  How many decks down is this client?  How far below decks will
the GPS signal penetrate?  How many water-tight bulkheads must be
traversed to get from the antena to the client?  Is there any free
space in the existing through-holes the network traverses? Will any of
the other things traversing the through holes along with the network
cable(s) interfere with the single traversing the antenna cable to be
added? Presumably we cannot trust the network here, which means
getting GPS signals to the client.

rick jones

One wonders if that might relate to some of the network problems -
interference with the network cables - so checking link-layer stats on
the client, the switch etc would be goodness.

-- 
I don't interest myself in "why". I think more often in terms of
"when", sometimes "where"; always "how much."  - Joubert
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...




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