renzki Posted May 30, 2005 Share Posted May 30, 2005 well most discussions seem to suggest that 100 meters is the length limit for cat 5e cables... i tried installing about 300 meters of cat 5e and this happened...there is no connection when i set the pc to 100mbps connection speed, but when i drop the speed to 10mbps half duplex, there is a good connection!!!what could be the reason behind this??? Link to comment Share on other sites More sharing options...
puntoMX Posted May 30, 2005 Share Posted May 30, 2005 The answer you already gave, it’s the speed limit. 10Mbps just use 4 pins and not 8 pins and so you can imagine that those 8 pins (read wires) make a lot more inference at a 10 times faster speed . Link to comment Share on other sites More sharing options...
renzki Posted May 30, 2005 Author Share Posted May 30, 2005 if that is the case, why did the 10mbps full duplex didnt work but the half-duplex setting worked when i tested it?... they both use the same number of wires right? Link to comment Share on other sites More sharing options...
puntoMX Posted May 30, 2005 Share Posted May 30, 2005 Yep, they do, but see full duplex (In and Out at the same time) as 20Mbps . Link to comment Share on other sites More sharing options...
renzki Posted May 31, 2005 Author Share Posted May 31, 2005 and i thought those electrons wouldnt have any problem travelling those wires at all... Link to comment Share on other sites More sharing options...
Zxian Posted May 31, 2005 Share Posted May 31, 2005 It's actually not the electrons that are moving in the wires... We had an assignment in my Electomagnetism course where we calculated the velocity of the electrons in a typical telephone wire... turned out to be about 30um/s (um = 1/1000000 m, you do the conversion to imperial... ). It's the electomagnetic wave that travels quickly along the wire.Just some food for thought. Link to comment Share on other sites More sharing options...
Bâshrat the Sneaky Posted May 31, 2005 Share Posted May 31, 2005 I agree with Zxian.It has to do with signal interference and not high enough signal strength for such distances. If you could use more power on the cable, it might work just fine. Only you'd have to hack your NIC for that Link to comment Share on other sites More sharing options...
puntoMX Posted May 31, 2005 Share Posted May 31, 2005 ****, I used the wrong word, "inference", it´s "interference" indeed... back to school to crank up my English Link to comment Share on other sites More sharing options...
Bâshrat the Sneaky Posted May 31, 2005 Share Posted May 31, 2005 ****, I used the wrong word, "inference", it´s "interference" indeed... back to school to crank up my English <{POST_SNAPBACK}>LOL Didn't notice though Link to comment Share on other sites More sharing options...
renzki Posted May 31, 2005 Author Share Posted May 31, 2005 I agree with Zxian.It has to do with signal interference and not high enough signal strength for such distances. If you could use more power on the cable, it might work just fine. Only you'd have to hack your NIC for that <{POST_SNAPBACK}>LOL! uve done that in the past havent u? Link to comment Share on other sites More sharing options...
Lost Soul Posted May 31, 2005 Share Posted May 31, 2005 just curious is there any way to boost this distance by like placing some kinds of signal blocks on the walls for every 100 meters Link to comment Share on other sites More sharing options...
Zxian Posted May 31, 2005 Share Posted May 31, 2005 @Lost Soul:Yep, that's exactly how they do it out in the bush.A friend of mine was working with a company last year that had a number of sensor systems placed out in the forest. They relayed the signals back to the base center using ethernet cables. They had to put relay stations every 200m or so (they designed their own ethernet controller circuits so they could boost the power) since they needed to transfer the data at 100Mbps Full Duplex.The relay circuit itself is really simple actually, just a plain old amplifier will do, with the signal in on one side and the signal out on the other. Link to comment Share on other sites More sharing options...
Lost Soul Posted June 1, 2005 Share Posted June 1, 2005 thats a great ideal,, how much do the relays cost Link to comment Share on other sites More sharing options...
Zxian Posted June 1, 2005 Share Posted June 1, 2005 If you wanted to make one for yourself, you could make one for ~$15 all included. I'm not too sure about commercial though... probably the same price. Link to comment Share on other sites More sharing options...
Bâshrat the Sneaky Posted June 1, 2005 Share Posted June 1, 2005 I'd be amazed if the commercial price would be so low If you also need to split up the network - which you probably don't have to - you could of course simply but switches in between... But I think you already knew that... Link to comment Share on other sites More sharing options...
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