TomLyall Posted April 11, 2004 Share Posted April 11, 2004 Also Cat 5 networking only uses 2 pairs and not all 4. er, now my turn to be pedantic.... 100 base ethernet will use all 4 pairs, 10 base uses 2 (brings back horrible memories of replacing in excess of 200 rj45's cus someone was told only to crimp two pairs...) Tom Link to comment Share on other sites More sharing options...
peternewman Posted April 12, 2004 Share Posted April 12, 2004 tomlyall, Also Cat 5 networking only uses 2 pairs and not all 4.er, now my turn to be pedantic.... 100 base ethernet will use all 4 pairs, 10 base uses 2 I am not trying to start a slanging match or anything but this is not the case according to our very own Tom Baldwin RJ-45 Pinout this was also backed up by various other sites on the web. PN Link to comment Share on other sites More sharing options...
TomLyall Posted April 12, 2004 Author Share Posted April 12, 2004 tomlyall, Also Cat 5 networking only uses 2 pairs and not all 4.er, now my turn to be pedantic.... 100 base ethernet will use all 4 pairs, 10 base uses 2 I am not trying to start a slanging match or anything but this is not the case according to our very own Tom Baldwin RJ-45 Pinout this was also backed up by various other sites on the web. PN again, not trying to argue but if you look on toms website again, you'll see it clearly states that the said configuration is for '10BaseT networking' Link to comment Share on other sites More sharing options...
peternewman Posted April 12, 2004 Share Posted April 12, 2004 Oops I feel really stupid now. Must look more carefully when reading websites. However what about this site here. Or maybe I should just give up. I'll get my crimper PN YAY 50 Posts finally :D Link to comment Share on other sites More sharing options...
TomLyall Posted April 12, 2004 Author Share Posted April 12, 2004 ah we all make mistakes and learn something new every day, I'd like to think im the first to admit that im far from perfect, however I do have a horrible habit of always thinking im right...:S Link to comment Share on other sites More sharing options...
Madmac Posted April 12, 2004 Share Posted April 12, 2004 er, now my turn to be pedantic.... 100 base ethernet will use all 4 pairs, 10 base uses 2 (brings back horrible memories of replacing in excess of 200 rj45's cus someone was told only to crimp two pairs...) Tom both 10baseT and 100baseT use 2 pairs The Power Over Ethernet spec allows the other 2 pairs to be used to carry power to remote devices (not recommended as not upgradeable ) . Also used in some Artnet adaptors for remote power. 1000baseT (or G)ethernet uses all 4 pairs Link to comment Share on other sites More sharing options...
TomLyall Posted April 12, 2004 Author Share Posted April 12, 2004 hmmm, I would argue to the grave that its 4, but you seem to know what you quoting, although that doesnt mean im giving up... im still really really sure that full duplex 100baset ethernet uses all four pairs of utp, [edit] bit of reading... your right, 100base-tX requires 2, 100base-t4 utilises all four, allowing the data to be 'spread' out among the data lines. Link to comment Share on other sites More sharing options...
peternewman Posted April 12, 2004 Share Posted April 12, 2004 My question to you Tom would be why do you need the third and forth pairs, what would be sent down them. You already have one pair for transmitting and one for recieving so why would you need a third and forth pair. WHOA!!!I have conclusive proof that 10/100 only needs 2 pairs:The ProofNotice how it saysThey are only appropriate if, to transmit data, 2 pairs are required.AndCat5 10/100 Economiser So there you go, this also seems to confim that 1000 needs all 4 pairs. PN Link to comment Share on other sites More sharing options...
TomLyall Posted April 12, 2004 Author Share Posted April 12, 2004 on a slightly different point, is that product not just a simple splitter, sortof ripping people off a bit... [edit][newline][/newline]Standard Cable Type Pairs/Strands Needed [newline][/newline]100BaseT4 Category 3, 4, or 5 UTP 4 pairs [newline][/newline]100BaseVG UTP Category 3, 4, or 5 UTP 4 pairs [newline][/newline]100BaseVG STP 150 Ohm STP 2 pairs [newline][/newline]100BaseTx Category 5 UTP 2 pairs[newline][/newline] Link to comment Share on other sites More sharing options...
peternewman Posted April 12, 2004 Share Posted April 12, 2004 on a slightly different point, is that product not just a simple splitter, sortof ripping people off a bit... Do you mean cost wise. If so then yes, because with a bit of simple planning you could wire the one cable straight into the back of a double socket. I suppose its a case of paying for an easy solution. I don't know if that is a particularly cheap model, just the first one I found when I googled for them having remembered about them. They are quite a clever idea I think. 100BaseTx, Category 5 UTP, 2 pairs You have just disproved yourself . Well certainly whenever I have networked things I have connected as Tx. PN Link to comment Share on other sites More sharing options...
TomLyall Posted April 12, 2004 Author Share Posted April 12, 2004 'You have just disproved yourself ' yes I know, I was planning to... ill get my humble pie.... Link to comment Share on other sites More sharing options...
peternewman Posted April 12, 2004 Share Posted April 12, 2004 I am intrigued though, what do the other 2 suffixes T4 and VG mean? PN Link to comment Share on other sites More sharing options...
TomLyall Posted April 12, 2004 Author Share Posted April 12, 2004 not quite sure about the VG but the T4 is simply because it uses all four pairs to the mods: sorry about the 13 or so off topic posts... Link to comment Share on other sites More sharing options...
gareth Posted April 12, 2004 Share Posted April 12, 2004 Moderation, 12/4/04, 14:45 - the above posts split from "Homemade DMX Cables" in the Lighting forum. Link to comment Share on other sites More sharing options...
Matt Posted April 12, 2004 Share Posted April 12, 2004 some 10base based network systems in offices have the telephone line running through the same cable, saving space and possibly time, I thought telephone system only uses 1 pair though not 2? Link to comment Share on other sites More sharing options...
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