[AusNOG] Water in Fibre cables

[Rod Veith]

There are many things that can pierce cable sheaths allowing moisture in without necessarily breaking communications.

 

The odd rat bite, tree roots, ants, backhoe, termites etc as many years of sheathed copper has shown. 

 

What I‘m curious about now is:

 

·        whether moisture directly against a fibre changes the refractive index of the fibre to an extent that communications is affected.

·        The construction profile of fibre cables being laid by the NBN from the exchange (redundant term in the NBN world??) to the home.

 

It has been many many years since I was last inside a manhole looking into cables. Still remember some on-the-job training and once beating a lead joint into submission  shape and turning some brown paper coated wires a slightly darker shade of brown. Gotta respect those blow torches J

 

Rod

 

From: ausnog-bounces at lists.ausnog.net [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Darren Ward (darrward)
Sent: Thursday, 8 March 2012 7:43 PM
To: Jake Anderson
Cc: ausnog at lists.ausnog.net; Paul Brooks
Subject: Re: [AusNOG] Solar flare

 

In a PON environment unless you have an unsealed junction/splitter water should be irrelevant?

Sent from my iPhone


On 08/03/2012, at 6:23 PM, "Jake Anderson" <yahoo at vapourforge.com> wrote:

You don't need to be on satellite to suffer from rain fade....
my home Adsl drops ~3mbit (50% of the epic 6 I usually achieve) when it rains.

That's my biggest fear for the NBN, currently a slightly dodgy connection somewhere that gets a bit wet is irritating but not the end of the world, methinks a smidge of water against a fiber is going to be game over.

On 03/08/2012 05:10 PM, Paul Brooks wrote: 

And to think I held off posting anything when the alert came through, thinking astronomical discussions would be uninteresting!

If your satellite dishes haven't blown away or floated away in the floods, or been affected by rain-fade within the atmosphere, then the solar wind may well fix your quiet evening.

If you have an interest in being alerted to this sort of thing in the future , www.spaceweather.com has a mailing list you can subscribe to.

This came through at 2:11am this morning, local Sydney time....




-------- Original Message -------- 


Subject: 

Another Major Flare


Date: 

Wed, 07 Mar 2012 09:11:44 -0600


From: 

SpaceWeather.com  <mailto:swlist at spaceweather.com> <swlist at spaceweather.com>


To: 

SpaceWeather.com  <mailto:swlist at spaceweather.com> <swlist at spaceweather.com>

 

Space Weather News for March 7, 2012
http://spaceweather.com
 
SOLAR ACTIVITY: Big sunspot AR1429 has unleashed another major flare--an X5-class eruption on March 7th at 00:28 UT.   As a result of the blast, a radiation storm is underway and a CME will likely hit Earth's magnetic field in a day or so. Geomagnetic storms are already in progress at high latitudes due to earlier eruptions from the active sunspot.  Last night, auroras were spotted over several northern-tier US states including Michigan and Wisconsin.  Check http://spaceweather.com for updates and images.
 
SPACE WEATHER ALERTS:  Would you like a call when geomagnetic storms are in progress? Space weather alerts are available from http://spaceweathertext.com (text) and http://spaceweatherphone.com (voice).
 
You are subscribed to the Space Weather mailing list, a free service of Spaceweather.com.
 
New subscribers may sign up for free space weather alerts at  http://spaceweather.com/services/ .
 
To unsubscribe click here: http://www.spaceweather2.com/u?id=976206S <http://www.spaceweather2.com/u?id=976206S&n=T&l=spaceweather> &n=T&l=spaceweather or send a blank email to leave-spaceweather-976206S at www.spaceweather2.com  
 



Lots of pretty pictures of CMEs and auroras at www.spaceweather.com.

cheers,
    Paul.




 
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