The internal Trango thermometer is to monitor the Ethernet chip as in
some of the radios it doesn't like getting cold <10C. I've had units
running with the internal thermometer upto 48C before with no problems.
I would think the most likely issue is interferance. First watch the
rssi, log in to each end and do a 'rssi' on the su and 'su ping' on the
ap, to make sure its not fading. Also do a linktest from the AP to see
how many dropped packets you get. It could also be an inversion layer,
unlikely but possible, that would partially explain it getting worse
during the day..
Michael Davies wrote:
Wow thanks for all the responses.
In reply to Neil Fenemor:
I can definitely see how thermal things like that and the way heat moves
could effect things, the building we link to isn't too far away but the
route as the crow flies is directly over the city and therefore a lot of
asphalt and whatnot so I can see how that would cause problems. I imagine
there's not a lot a lot that can be done to prevent/circumvent that other
than changing to a different connection method.
Irt Mark Foster & others regarding heat:
This definitely sounds like something I'll have to look at further, I know
the trango unit does have some kind of internal thermometer (probably for
this very reason) so I'll look into a way of graphing the output from that.
What kind of temperatures would be classed as too high? 40-50deg?
Irt Dave, I'll reply off list.
Btw hopefully the weather keeps up, would be nice to see a warm end to
From: Ben Deller - Airnet NZ [mailto:email@example.com]
Sent: Tuesday, 1 August 2006 4:22 p.m.
To: Michael Davies
Subject: RE: [nznog] Wireless link adversly affected by the sun?
Perhaps try being more specific in isolating the problem.
Is it latency and jitter in the wireless link or past the link out on
another network (the internet)?
Try the smokeping test to your ISP's network not the internet.
Also have you checked you signal and noise levels on the wireless link? (Or
asked your ISP to check this)
It could be wireless interference from another network.
Or it could just be too hot.
From: Michael Davies [mailto:firstname.lastname@example.org]
Sent: Tuesday, 1 August 2006 3:48 p.m.
Subject: [nznog] Wireless link adversly affected by the sun?
As the subject suggests, I've been noticing an interesting problem with our
internet. We're lucky enough to be on the receiving end of a wireless net
connection running through Trango broadband hardware, fairly conventional
wireless tech. However I've noticed through monitoring the connection with
smokeping to various places around the country that the connection quality
seems to decrease dramatically through the middle of the day, but not every
day. At first I thought that this was simply related to congestion
somewhere, but from following the weather a bit I've started noticing that
it gets worse on the nice sunny days.
For example: Today, a balmy 17 degrees in Dunedin and beautifully sunny all
day. Packet loss and jitter begins to increase at about 9am and peaks about
1pm with 60% loss, then at 2pm as if flicking a switch it returns to nearly
0% loss. From looking at the graphs over time, this does happen quite often
but not every day and the loss today is definitely the worst I've seen it
(but also the warmest/sunniest day we've had in Dunedin for quite a while).
Has anyone seen or heard of this happening before? Would there be any way to
prevent this - supposing that the sun is the culprit - short of installing a
Mr. Burns type sun shield?
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Bill Walker, MCSE, MCP+I
NZ Tel: +64 21 190 4411 MSN: msn(a)wjw.co.uk
UK Tel: +44 20 8123 3749 Skype: wjw.co.uk
Postal: 47 Wroxton Terrace, Fendalton, Christchurch