Post by: xorgos on February 12, 2013, 01:51:00 PM
(IMG:http://i.imgur.com/cXbOrHz.jpg)
(IMG:http://i.imgur.com/6DXZT7e.jpg)
(IMG:http://i.imgur.com/iFhhQWo.jpg)
This post has been edited by xorgos: Feb 12 2013, 10:03 PM
Post by: lessweightgofaster on February 17, 2013, 10:21:00 AM
Cheers
Ian
Post by: RBJTech on March 09, 2007, 02:02:00 AM
This is extremly useful is you have taken the time to run a long RJ45 cable around your house, only to discover that you now should have run two cables as you need another one ... doh!
The 10/100 Mbit/spec only actually uses 4 of the 8 available wires as so :-
1. White/Orange (used - Tx Pair 1)
2. Orange/White (used - Rx Pair 1)
3. White/Green (used - Tx Pair 2)
4. Blue/White - not used.
5. White/Blue - not used.
6. Green/White - (used - Rx Pair 2)
7. White/Brown - not used.
8. Brown/White - not used.
So all we need to do is wire the 2 unused pairs (4 wires) into the same connections as you would have done normally in the 2nd RJ45 plug at both ends of the RJ45 wire - ie
(was 5 now 1) White/Blue (now used, Tx Pair 3)
(was 4 now 2) Blue/White (now used, Rx Pair 3)
(was 7 now 3) White/Brown (now used, Tx Pair 4)
(was 8 now 6) Brown/White (now used, Rx Pair 4)
There you have it, 2 Ethernet connections down a single RJ45 wire.
There are a few different ways to practically implement this
A.) Use a RJ45 faceplates, where you can simply wire the 'fixed' cabling as above, keeping the RJ flyleads the same. You'll need to buy 2 x RJ45 dual faceplates but it will look much more professional ...
B.) Buy some RJ45 plugs and an RJ45 crimper - not the most cost effective option if you are just doing a couple of connections though ...
C.) Lastly, cut the ends off existing RJ45 patch cables and connect the wires together. It's important to try and keep the 'twists' going, especially for longer runs of cable. Ideally solder the wires together and use heat shrink, but if you're really on a budget, then electrical tape and twisted wires should work ok ..
Last couple of points -
1. This will NOT work for Gigabit Ethernet - that uses all 4 pairs.
2. Make sure you identify the pins correctly, the colour codes I've given 'may' not be valid for your cables (there are two different standards..
)Look here to check the RJ45 Pinout (courtesy datalinkcom.net)
Enjoy ...
Post by: tgm4883 on March 09, 2007, 08:28:00 AM
Post by: Reaper527 on March 09, 2007, 09:47:00 AM
also you don't have to hog up a power outlet with a switch if you do it this way.
Post by: RBJTech on March 09, 2007, 12:56:00 PM
QUOTE(Reaper527 @ Mar 9 2007, 04:54 PM) 
because you've already gone through the trouble to wire up the wall, and this looks SO much nicer
also you don't have to hog up a power outlet with a switch if you do it this way.Absolutely ..
Here's a quick diagram too for those that follow diagrams better than my explanation ...
Post by: StrictPuppet on March 09, 2007, 11:33:00 PM
Post by: DuBob4432 on March 16, 2007, 08:33:00 AM
also, what about GbE? i have one piece of cat5e running into the master bedroom where my 360 is and obviously 10/100 is fine for the 360, but i also have a laptop, and i move a lot of data around the condo, so GbE is kind of a must if i am going to use a wired connection, otherwise i would just the laptopls 802.11g connection.
thanks in advance for this and also your lan activity mod - one i am going to do since i plan on getting a new faceplace anyway in case i mess it up, but i have always been curious with lan activity, any chance for a hdd activity led??
thanks again for your hard work and knowledge
Post by: tgm4883 on March 16, 2007, 10:14:00 PM
QUOTE(DuBob4432 @ Mar 16 2007, 08:40 AM)
just out of curiosity, does this mess with the 100M spec? or could one still use a 100M piece of ca5e/cat6 and not have any issues?
also, what about GbE? i have one piece of cat5e running into the master bedroom where my 360 is and obviously 10/100 is fine for the 360, but i also have a laptop, and i move a lot of data around the condo, so GbE is kind of a must if i am going to use a wired connection, otherwise i would just the laptopls 802.11g connection.
thanks in advance for this and also your lan activity mod - one i am going to do since i plan on getting a new faceplace anyway in case i mess it up, but i have always been curious with lan activity, any chance for a hdd activity led??
thanks again for your hard work and knowledge
QUOTE(RBJTech @ Mar 9 2007, 03:09 AM)
Last couple of points -
1. This will NOT work for Gigabit Ethernet - that uses all 4 pairs.
2. Make sure you identify the pins correctly, the colour codes I've given 'may' not be valid for your cables (there are two different standards..
)Post by: DuBob4432 on March 17, 2007, 09:27:00 AM
Post by: magic_man185 on April 20, 2007, 01:39:00 PM
QUOTE(RBJTech @ Mar 9 2007, 05:09 AM) 
1. White/Orange (used - Tx Pair 1)
2. Orange/White (used - Rx Pair 1)
3. White/Green (used - Tx Pair 2)
4. Blue/White - not used.
5. White/Blue - not used.
6. Green/White - (used - Rx Pair 2)
7. White/Brown - not used.
8. Brown/White - not used.
Just a minor correction, pins 1 and 2 are both used for transmit, pin 1 for +, pin 2 for -, and the same for pins 3 and 6 as receive.
Post by: ChadH on May 19, 2007, 04:35:00 PM
What this means with Cat5e is that you can't run two 100Mbps links down the same wire as it will exceed the specification, and result in a lot of lost data packets - which in turn means very slow network speeds. When I've done this in the past, I've always ensured that one of the links runs at 100Mbps, and the other at 10Mbps.
If you're using Cat6 then you can run two links at 100Mbps.
It's worth checking that your cable is Cat5e, and not Cat5 - Cat5 is only rated at 100Mbps, and therefore you can only really get away with both links running at 10Mbps.
Post by: tcrandal on May 23, 2007, 07:33:00 PM
Do yourself a favor and buy a switch. I build data centers for a living, and if it was a recommended way of doing things, cable costs for new sites would have been reduced by 50%.
Take off the sticky, it's not worthy.
Post by: RBJTech on June 15, 2007, 04:20:00 AM
Secondly, I have never had ANY packet loss issues running two 100 Mbit connections down a single RJ45 cable (cat 5e). As long as you maintain the twists and keep to the correct pairs then this is actually no different whatsoever from a packed bundle of UTP RJ45 cables - I also build data centres ... (IMG:style_emoticons/default/wink.gif)
Thirdly - we are not talking data centre grade communications here - I'd be very much surpised if both channels will be anywhere near maxed out at the same time in a typical home environment. I would not do it in a commercial implementation but for home use it's perfectly acceptable IMO.
Lastly - the 100Mbit or even 10Mbit/Sec speed is not the bottleneck on most peoples broadband/Xbox Live connection - it's the broadband itself, so speed is not really the issue here, it's practicality ...
If you don't want to do it fine - but I assure you it works fine for 99.9% of the people on this board ...
This post has been edited by RBJTech: Jun 15 2007, 11:22 AM
Post by: AfternoonLemon on June 19, 2007, 02:38:00 PM
Post by: Vatamin R on November 16, 2007, 06:45:00 PM
Post by: Millerboy3 on November 27, 2008, 09:12:00 PM
Post by: kat kon on January 04, 2009, 04:14:00 PM
QUOTE(AfternoonLemon @ Jun 19 2007, 02:38 PM) 
I've done this for years, although it is a halved for a PC and XBox - they both won't be maxing out their bandwidth at the same time. I don't think there is any problems of interference - the 4 pairs are twisted for the full length of the cable, and seperated at the double wall socket at either end. Just the same as gigabit ethernet uses, except the data is not combined into one line.
People, this 100 Megabit thing is a Red Hearing. You don't need to worry about 'combined bandwidth'. If that was the case, you wouldn't be able to Transmit at 100 Megabit while Receiving on the other differential pair at 100 Megabit rates.
If you don't want a switch (and it's latency) between you and your ISP, this will work just fine.
Post by: scibot on November 04, 2009, 03:49:00 PM
Just a small change though, there is only 1 wiring standard for straight through ethernet, T568A. The other one is T568B, and it is the same but with a reversed pair, for crossover connections.
Post by: nkarnold on December 04, 2009, 05:20:00 PM
Just get a cheap 10/100/1000 4 or 8 port SWITCH. who cares if you need to provide power..