On 11/07/2010 09:44 AM, John Weller wrote: > Hi Leland, > > I think you misunderstood my reply (or I didn't make it clear enough<g>). > Mike suggested that using fibre optic was slowing transmission down based on > your original comment - he (and you) are of course quite correct, the > velocity of propagation in a fibre optic is less than in copper. My point > was that whilst velocity of propagation is lower the possible data > transmission rate in baud is higher through fibre optic than copper as there > will be much less degradation at high frequencies. There is also virtually > no RF interference on fibre optic unlike copper. > > John Weller > 01380 723235 > 07976 393631 >
OK. I guess this explains why fiber optic cables are effective over much greater distances, (eg around 1,200 kilometer), as compared to UTP copper cables which are only effective over a much shorter distance of around 295 feet. The down side of using fiber optic in our local networks, for guys like you and I, is cost. Going fiber optic in a local network will cost about double the cost of going the more traditional route, based on a link I came across. Over time the price of fiber optic might come down to a point where it can compete with the more traditional UTP cables, but I expect UTP to dominate in local networks for the foreseeable future. Still, when connections over distances exceeding the UTP limitations are needed, fiber optic may be a good choice. I'm not sure about the effective distance over telephone lines, but I do remember how slow a 56K modem seems to me compared to the cable modem I have today. LOL I'm not sure whether the bottleneck was the older internet infrastructure, analog to digital modem limitations, or what, but I sure do enjoy SuddenLinks fiber optic, digital backbone to which I connect today. Regards, LelandJ >> -----Original Message----- >> From: profoxtech-boun...@leafe.com [mailto:profoxtech-boun...@leafe.com] > On Behalf >> Of Leland Jackson >> Sent: 07 November 2010 15:32 >> To: profoxt...@leafe.com >> Subject: Re: [NF] Signal delivery over long ethernet cable >> >> On 11/07/2010 02:39 AM, John Weller wrote: >>> No. Fibre optic can take a much higher data rate than copper without >>> significant degradation and it is that which causes the increase in > speed of >>> data transmission. >>> >>> John Weller >>> 01380 723235 >>> 07976 393631 >> Light propagates most efficiently in a vacuum, (eg an absent of >> matter). The propagation of light is slowed down when it travel through >> matter, for example, water slows down the speed of propagation; >> although, I guess, light itself always travels at its constant speed. >> >> The increase speed in transmitting data is due to new techniques that >> allow each fiber optic cable, which is about the size of a human hair, >> more bandwidth. Efforts are under way to further increase the bandwidth >> of each fiber optic cable in a backbone line by a factor to 10, over the >> original method used. To achieve this 10 fold increase will require new >> fiber optic lines, I believe, while the increase by 4 works fine over >> the original fiber optic cables. >> >> Regards, >> >> LelandJ >> >> >>>> So replacing the old copper with fiber optic is making it slower? lol >>>> >>>> -- >>>> Mike Babcock, MCP >>>> MB Software Solutions, LLC [excessive quoting removed by server] _______________________________________________ Post Messages to: ProFox@leafe.com Subscription Maintenance: http://leafe.com/mailman/listinfo/profox OT-free version of this list: http://leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/4cd6d317.4030...@mail.smvfp.com ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.
