[time-nuts] wifi with time sync

Bob Camp kb8tq at n1k.org
Sun Jan 15 09:27:01 EST 2017


Again, this is why the interest in “how the heck did they accomplish it?
With the claim of microsecond level performance, they must have run
into all these issues. 


Just a note: any time I want to do anything that matters, I put it on 5 GHz.
There are still issues, but not quite as many. The data I presented is 
from a 5 GHz link. There’s also data over the same time period showing
LAN pings all running below 1 ms for the same 24 hour period. The random
delay bumps are WiFi specific. 


> On Jan 15, 2017, at 12:51 AM, Bill Hawkins <bill.iaxs at pobox.com> wrote:
> I haven't read the entire thread, but this may be relevant. If not, you
> know where to find the delete key.
> I live in a life care community - one of 450 people in 300 apartments on
> 3 floors. When I moved in a year ago, I could get Internet from the
> house cable, and they provided the modem. I bought wired and wireless
> 802.11n dual band routers for two apartments, a two bedroom for us and
> an alcove for my shop. There was plenty of noise from other such
> routers, but no problem within an apartment. I couldn't use a wireless
> keyboard, though. The cursor wandered around with the noise.
> Last month, a company experienced in wiring hotels for wireless put DSL
> to RJ-45 and 11n wireless access points in each apartment on the second
> floor, adding 100 transmitters to the mix. DSL with existing phone
> wiring was far cheaper than running new cable. The intent was to provide
> universal public Wi-Fi for the children of the residents.
> They might as well have installed 100 jammers. There were complaints of
> unusable cordless phones (most in the 2.4 GHz range) and lost Wi-Fi
> connections that simply reverted to the default IP address range and
> failed to reconnect.
> I got a home copy (this is my home) of InSSIDer software and surveyed
> the halls at 2.4 GHz with a Windows 7 laptop (you need a larger screen
> to see the signal distribution) I could see 10 to 20 of the new access
> points, as well as the occasional excursion to -10 dbm (top of scale) as
> nearby routers and printers kicked in. Great stuff.
> There are environments where time sync with Wi-Fi hasn't got a chance.
> Jim Lux was looking for a COTS solution to time sync, and this might
> work in a controlled environment.
> Don't even think about consumer radio clocks that sync from unknown
> Wi-Fi environments.
> Bill Hawkins (John Hawkins son)
> bill.iaxs at pobox.com
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