[H-GEN] FYI: Internet access via electricity cable system (fwd)

[Michael Anthon]

Errr.. surely they can't be serious ?  It's hard enough getting a modem to 
work over a twisted copper pair at 56k and they are talking about getting 
1M over open wire power transmission lines?  Gimme a break !!

I was invlolved in doinf a Power Line Carrier system a few years back.  At 
100 kHz, the characteristic impedance of the standard power cable 
configuration is about 5-10 ohms.  At 300kHz, this is down to about 1-2 
ohms.  This would require a rather significant amount of power to drive a 
signal into.  I find it difficult to reign in my scepticism at this claim.

The other issue is that the highest barrier to communications over power 
lines has always been the pwoer transformers.  These rather large block of 
iron tend to act as rather good HF filters whcih makes it a tad difficult 
(if not impossible) to pass data through them.  It is possible to add HF 
bypasses to these, but again, signal attenuation is a big problem.

Frnakly, I won't be holding my breath for SEQEB (oh, sorry, Energex) to be 
installing this in my area.

Regards
Michael Anthon

-----Original Message-----
From:	Raymond Smith [SMTP:raymonds at uq.net.au]
Sent:	Friday, February 20, 1998 12:12 PM
To:	general at humbug.org.au
Subject:	[H-GEN] FYI: Internet access via electricity cable system (fwd)

Cool, eh? It could add new dimension to power surges.

Raymond.

---
raymond at humbug.org.au

------- Forwarded Message

Date:    Thu, 19 Feb 98 14:17:30 -0500
From:    Tom Taylor <taylor at nortel.ca>
To:      cell-relay at cell.ucs.indiana.edu
Subject: CR: Re: Internet access via electricity cable system

See http://www.nortel.com/broadband/reference/norweb.html


serhan at superonline.net wrote:
>
> Hello,
>
> I want to lesrn something about "Internet access via electricity cable
> system".
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> -----== Posted via Deja News, The Leader in Internet Discussion ==-----
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------- End of Forwarded Message


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