[time-nuts] new year crashes
tractorb at ihug.co.nz
Mon Jan 2 16:15:36 EST 2017
It's not the fibre-it's the equipment on the end of it-specifically the multiplex equipment. And with path switching where differing eqpt was used on different links..... you can guess the result!
Different technologies these days but the terminal eqpts, (where your packets are injected/extracted to/from all the rest) collectively are the major contributors to end-to-end latency and its 'variablilty'.
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Hal Murray
Sent: Monday, 2 January 2017 11:48 p.m.
To: Discussion of precise time and frequency measurement
Cc: hmurray at megapathdsl.net
Subject: Re: [time-nuts] new year crashes
tractorb at ihug.co.nz said:
> The 'landline' networks also have significant (and variable) latency.
> ISTR measuring a maximum of around 400/500 mSec some years ago on a
> WN-CH digital link. Minimum over the test period of a week was nearer 250 mSec a few days
How can they get a delay that long? Satellite link?
Fiber is 5 microseconds per km. So 1000 km is 5 ms.
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