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| Thread ID: 75358 | 2006-12-25 23:13:00 | Further abuse of Cat5 cable | personthingy (1670) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 509663 | 2006-12-26 04:39:00 | Not Found The requested URL /abuse_of_cat5.jpg was not found on this server. I just tried to browse every.orcon.net.nz site i know, seems Orcons webserver is having a bad day :( I put the pic here as well, on a registerdirect server millerton.co.nz |
personthingy (1670) | ||
| 509664 | 2006-12-26 04:44:00 | I just tried to browse every.orcon.net.nz site i know, seems Orcons webserver is having a bad day :( I put the pic here as well, on a registerdirect server millerton.co.nz Glad to see you let the neighbourhood kids draw for you LOL. but pretty impressive |
plod (107) | ||
| 509665 | 2006-12-26 04:50:00 | Use of the extra pair in this way will generate additional noise, slowing the possible transmission speed of the ethernet link. If this is not a problem, go ahead. If it could be a problem, extra cable would be much better.I'm not too worried about the transmission speed to the lounge, there's no lounge computer, and if there ever was to be one, i cant see it moving much data, thats what the server and the office computer is for. What i am worried about is the quality of the Audio feed Thanks plod :) No child labor was exploited in the drawing of what i have in mind, i can draw that good all by my self! :p |
personthingy (1670) | ||
| 509666 | 2006-12-26 05:13:00 | I mentioned the speaker level in case any other readers got the idea they could and so cause themselves/others some grief. If you used the 1Volt line levels, I can't see a problem. I have used the spare pairs also for digital phones and neither the phones or the data connection had any problems at all. The digital phones were real bast**ds when it came to any noise being induced. |
pheonix (36) | ||
| 509667 | 2006-12-26 19:28:00 | Having realized that the blue and brown pair in standard cat5 cable don't actually do anything under normal use, ? I used to do structured cabling at Akld Uni. Under normal use means thats fine for a 10Mb connection, but for 100mb you did need all 8. |
pctek (84) | ||
| 509668 | 2006-12-26 20:51:00 | I used to do structured cabling at Akld Uni. Under normal use means thats fine for a 10Mb connection, but for 100mb you did need all 8.Cool! I didn't actually realize this, but fortunately this won't make any real difference as there is no lounge computer, and the socket will probably only ever be used for someone checking their email via their laptop on my connection. As my Internet connection is limited to 10Mb/sec, there's not much to be gained with a 100Mb/sec feed to that room. However that's a good point to keep in mind with future work. :D |
personthingy (1670) | ||
| 509669 | 2006-12-26 23:34:00 | I don't see a problem at all. It should be OK for audio provided that the cable doesn't run too close to power wiring in the walls. Twisted audio pairs do cancel-out induced noise, but that cancellation is not perfect and depends on how well the Cat 5 was run in the first instance. If it has any kinks, sharp ends or is compressed under clamps that could cause impedance variations and create other issues. The audio won't interfere with your data, but I'd check that the data doesn't cause a problem for the audio by turning the volume up with no signal on that input, then sending some data down the ethernet line and checking for noise from your speakers. Cheers Billy *<8-{)= |
Billy T (70) | ||
| 509670 | 2006-12-26 23:42:00 | Thank you Billy, Thats exactly what i was hoping, so i'm now ready to go and buy a little cat5 cable to gently mutilate so that i can run amarok of the central server, and use it to feed the ever varying main house sound machine. |
personthingy (1670) | ||
| 509671 | 2006-12-27 02:20:00 | PCtek , why does the 100mb use all 8? It still only has a send pair and a receive pair. Thats 4 of the 8 wires. I know that with the telephone over the same cable, the data still runs at 100Mb/s. |
pheonix (36) | ||
| 509672 | 2006-12-27 03:15:00 | There have been a number of 100 MHz twisted pair Ethernet systems . :D One did use all 4 pairs . The commonly used system uses only the two pairs 1+2, 3+6 . Even volts of audio won't bother the Ethernet . It's at megahertz, not audio frequencies . Even the other way shouldn't give problems, as long as the audio is a true balanced system, and at reasonable levels "0 dBm") . Otherwise, you might get rectification of the RF Ethernet signals in the amplifiers (detection, as in an AM receiver) . There will be slight coupling ("leakage") because no balanced system is perfect but the frequencies are so widely different there should be no problems . If you were dependent on millivolt level signals in one of the systems, it might be different . |
Graham L (2) | ||
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